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Jörg Prante 3 years ago
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14
.gitignore vendored
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/.settings
/.classpath
/.project
/.gradle
**/data
**/work
**/logs
**/.idea
**/target
**/out
**/build
.DS_Store
*.iml
*~

202
LICENSE.txt
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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build.gradle
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plugins {
id "de.marcphilipp.nexus-publish" version "0.4.0"
id "io.codearte.nexus-staging" version "0.21.1"
}
wrapper {
gradleVersion = "${project.property('gradle.wrapper.version')}"
distributionType = Wrapper.DistributionType.ALL
}
ext {
user = 'jprante'
name = 'event'
description = 'Event framework for Java (NIO paths, files, timers, journals)'
inceptionYear = '2021'
url = 'https://github.com/' + user + '/' + name
scmUrl = 'https://github.com/' + user + '/' + name
scmConnection = 'scm:git:git://github.com/' + user + '/' + name + '.git'
scmDeveloperConnection = 'scm:git:ssh://git@github.com:' + user + '/' + name + '.git'
issueManagementSystem = 'Github'
issueManagementUrl = ext.scmUrl + '/issues'
licenseName = 'The Apache License, Version 2.0'
licenseUrl = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
}
apply plugin: 'java-library'
apply from: rootProject.file('gradle/ide/idea.gradle')
apply from: rootProject.file('gradle/compile/java.gradle')
apply from: rootProject.file('gradle/test/junit5.gradle')
apply from: rootProject.file('gradle/repositories/maven.gradle')
apply from: rootProject.file('gradle/publishing/publication.gradle')
apply from: rootProject.file('gradle/publishing/sonatype.gradle')
dependencies {
api "org.xbib:settings-api:${project.property('xbib-content.version')}"
implementation "org.xbib:guava:${project.property('xbib-guava.version')}"
implementation "org.xbib:time:${project.property('xbib-time.version')}"
implementation "org.xbib:datastructures-json-tiny:${project.property('xbib-datastructures.version')}"
implementation "org.reactivestreams:reactive-streams:${project.property('reactivestreams.version')}"
testImplementation "io.reactivex.rxjava3:rxjava:${project.property('rxjava3.version')}"
}

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gradle.properties
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group = org.xbib
name = event
version = 0.0.1
org.gradle.warning.mode = ALL
gradle.wrapper.version = 7.3.2
xbib-guava.version = 30.1
xbib-content.version = 4.0.0
xbib-time.version = 2.1.1
xbib-datastructures.version = 1.0.0
reactivestreams.version = 1.0.3
rxjava3.version = 3.0.3

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gradle/compile/java.gradle
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apply plugin: 'java-library'
java {
modularity.inferModulePath.set(true)
}
compileJava {
sourceCompatibility = JavaVersion.VERSION_11
targetCompatibility = JavaVersion.VERSION_11
}
compileTestJava {
sourceCompatibility = JavaVersion.VERSION_11
targetCompatibility = JavaVersion.VERSION_11
}
jar {
manifest {
attributes('Implementation-Version': project.version)
}
}
task sourcesJar(type: Jar, dependsOn: classes) {
classifier 'sources'
from sourceSets.main.allSource
}
task javadocJar(type: Jar, dependsOn: javadoc) {
classifier 'javadoc'
}
artifacts {
archives sourcesJar, javadocJar
}
tasks.withType(JavaCompile) {
options.compilerArgs << '-Xlint:all,-fallthrough'
}
javadoc {
options.addStringOption('Xdoclint:none', '-quiet')
}

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gradle/documentation/asciidoc.gradle
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apply plugin: 'org.xbib.gradle.plugin.asciidoctor'
configurations {
asciidoclet
}
dependencies {
asciidoclet "org.asciidoctor:asciidoclet:${project.property('asciidoclet.version')}"
}
asciidoctor {
backends 'html5'
outputDir = file("${rootProject.projectDir}/docs")
separateOutputDirs = false
attributes 'source-highlighter': 'coderay',
idprefix: '',
idseparator: '-',
toc: 'left',
doctype: 'book',
icons: 'font',
encoding: 'utf-8',
sectlink: true,
sectanchors: true,
linkattrs: true,
imagesdir: 'img',
stylesheet: "${projectDir}/src/docs/asciidoc/css/foundation.css"
}
/*javadoc {
options.docletpath = configurations.asciidoclet.files.asType(List)
options.doclet = 'org.asciidoctor.Asciidoclet'
//options.overview = "src/docs/asciidoclet/overview.adoc"
options.addStringOption "-base-dir", "${projectDir}"
options.addStringOption "-attribute",
"name=${project.name},version=${project.version},title-link=https://github.com/xbib/${project.name}"
configure(options) {
noTimestamp = true
}
}*/
/*javadoc {
options.docletpath = configurations.asciidoclet.files.asType(List)
options.doclet = 'org.asciidoctor.Asciidoclet'
options.overview = "${rootProject.projectDir}/src/docs/asciidoclet/overview.adoc"
options.addStringOption "-base-dir", "${projectDir}"
options.addStringOption "-attribute",
"name=${project.name},version=${project.version},title-link=https://github.com/xbib/${project.name}"
options.destinationDirectory(file("${projectDir}/docs/javadoc"))
configure(options) {
noTimestamp = true
}
}*/

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gradle/ide/idea.gradle
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apply plugin: 'idea'
idea {
module {
outputDir file('build/classes/java/main')
testOutputDir file('build/classes/java/test')
}
}
if (project.convention.findPlugin(JavaPluginConvention)) {
//sourceSets.main.output.classesDirs = file("build/classes/java/main")
//sourceSets.test.output.classesDirs = file("build/classes/java/test")
}

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gradle/publishing/publication.gradle
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apply plugin: "de.marcphilipp.nexus-publish"
publishing {
publications {
mavenJava(MavenPublication) {
from components.java
artifact sourcesJar
artifact javadocJar
pom {
name = project.name
description = rootProject.ext.description
url = rootProject.ext.url
inceptionYear = rootProject.ext.inceptionYear
packaging = 'jar'
organization {
name = 'xbib'
url = 'https://xbib.org'
}
developers {
developer {
id = 'jprante'
name = 'Jörg Prante'
email = 'joergprante@gmail.com'
url = 'https://github.com/jprante'
}
}
scm {
url = rootProject.ext.scmUrl
connection = rootProject.ext.scmConnection
developerConnection = rootProject.ext.scmDeveloperConnection
}
issueManagement {
system = rootProject.ext.issueManagementSystem
url = rootProject.ext.issueManagementUrl
}
licenses {
license {
name = rootProject.ext.licenseName
url = rootProject.ext.licenseUrl
distribution = 'repo'
}
}
}
}
}
}
if (project.hasProperty("signing.keyId")) {
apply plugin: 'signing'
signing {
sign publishing.publications.mavenJava
}
}
if (project.hasProperty("ossrhUsername")) {
nexusPublishing {
repositories {
sonatype {
username = project.property('ossrhUsername')
password = project.property('ossrhPassword')
packageGroup = "org.xbib"
}
}
}
}

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gradle/publishing/sonatype.gradle
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if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
apply plugin: 'io.codearte.nexus-staging'
nexusStaging {
username = project.property('ossrhUsername')
password = project.property('ossrhPassword')
packageGroup = "org.xbib"
}
}

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gradle/repositories/maven.gradle
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repositories {
mavenLocal()
mavenCentral()
}

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gradle/test/junit5.gradle
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def junitVersion = project.hasProperty('junit.version')?project.property('junit.version'):'5.6.2'
def hamcrestVersion = project.hasProperty('hamcrest.version')?project.property('hamcrest.version'):'2.2'
dependencies {
testImplementation "org.junit.jupiter:junit-jupiter-api:${junitVersion}"
testImplementation "org.junit.jupiter:junit-jupiter-params:${junitVersion}"
testImplementation "org.hamcrest:hamcrest-library:${hamcrestVersion}"
testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${junitVersion}"
}
test {
useJUnitPlatform()
failFast = true
testLogging {
events 'STARTED', 'PASSED', 'FAILED', 'SKIPPED'
}
afterSuite { desc, result ->
if (!desc.parent) {
println "\nTest result: ${result.resultType}"
println "Test summary: ${result.testCount} tests, " +
"${result.successfulTestCount} succeeded, " +
"${result.failedTestCount} failed, " +
"${result.skippedTestCount} skipped"
}
}
}

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gradle/wrapper/gradle-wrapper.properties vendored
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.2-all.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

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gradlew vendored
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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
APP_NAME="Gradle"
APP_BASE_NAME=${0##*/}
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Collect all arguments for the java command;
# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
# shell script including quotes and variable substitutions, so put them in
# double quotes to make sure that they get re-expanded; and
# * put everything else in single quotes, so that it's not re-expanded.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

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gradlew.bat vendored
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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto execute
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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settings.gradle
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src/main/java/org/xbib/event/Event.java
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package org.xbib.event;
import java.util.Map;
public interface Event {
void setKey(String key);
String getKey();
void setMap(Map<String, Object> map);
Map<String, Object> getMap();
}

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src/main/java/org/xbib/event/EventConsumer.java
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package org.xbib.event;
public interface EventConsumer {
}

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src/main/java/org/xbib/event/EventService.java
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package org.xbib.event;
public class EventService {
}

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src/main/java/org/xbib/event/FileFollowEvent.java
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package org.xbib.event;
public class FileFollowEvent {
}

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src/main/java/org/xbib/event/async/AbstractAsyncFileReaderLines.java
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package org.xbib.event.async;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.CompletionHandler;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.security.InvalidParameterException;
import java.util.function.ObjIntConsumer;
import static java.nio.channels.AsynchronousFileChannel.open;
/**
* Asynchronous non-blocking read operations that use an underlying AsynchronousFileChannel.
*/
public abstract class AbstractAsyncFileReaderLines {
static final int BUFFER_SIZE = 4096 * 8; // the transfer buffer size
private static final int MAX_LINE_SIZE = 4096;
private static final int LF = '\n';
private static final int CR = '\r';
//
// This flag will track whether this `Subscription` is to be considered cancelled or not.
private boolean cancelled = false;
/**
* Asynchronous read chunk operation, callback based.
*/
private static void readBytes(
AsynchronousFileChannel asyncFile,
long position, // current read or write position in file
byte[] data, // buffer for current producing line
int size,
ObjIntConsumer<Throwable> completed) {
if (completed == null)
throw new InvalidParameterException("callback can't be null!");
if (size > data.length)
size = data.length;
if (size == 0) {
completed.accept(null, 0);
return;
}
ByteBuffer buf = ByteBuffer.wrap(data, 0, size);
CompletionHandler<Integer, Object> readCompleted =
new CompletionHandler<>() {
@Override
public void completed(Integer result, Object attachment) {
completed.accept(null, result);
}
@Override
public void failed(Throwable exc, Object attachment) {
completed.accept(exc, 0);
}
};
asyncFile.read(buf, position, null, readCompleted);
}
protected abstract void onError(Throwable error);
protected abstract void onComplete();
protected abstract void onProduceLine(String line);
public final void cancel() {
cancelled = true;
}
public final boolean isCancelled() {
return cancelled;
}
final void readLines(Path file) throws IOException {
readLines(open(file, StandardOpenOption.READ), BUFFER_SIZE);
}
/**
* Read bytes from an {@code AsynchronousFileChannel}, which are decoded into characters
* using the UTF-8 charset.
* The resulting characters are parsed by line and passed to the destination buffer.
*
* @param asyncFile the nio associated file channel.
* @param bufferSize
*/
final void readLines(
AsynchronousFileChannel asyncFile,
int bufferSize) {
readLines(asyncFile, 0, 0, 0, new byte[bufferSize], new byte[MAX_LINE_SIZE], 0);
}
/**
* There is a recursion on `readLines()`establishing a serial order among:
* `readLines()` -> `produceLine()` -> `onProduceLine()` -> `readLines()` -> and so on.
* It finishes with a call to `close()`.
*
* @param asyncFile the nio associated file channel.
* @param position current read or write position in file.
* @param bufpos read position in buffer.
* @param bufsize total bytes in buffer.
* @param buffer buffer for current producing line.
* @param auxline the transfer buffer.
* @param linepos current position in producing line.
*/
private void readLines(
AsynchronousFileChannel asyncFile,
long position, // current read or write position in file
int bufpos, // read position in buffer
int bufsize, // total bytes in buffer
byte[] buffer, // buffer for current producing line
byte[] auxline, // the transfer buffer
int linepos) // current position in producing line
{
while (bufpos < bufsize) {
if (buffer[bufpos] == LF) {
if (linepos > 0 && auxline[linepos - 1] == CR) linepos--;
bufpos++;
produceLine(auxline, linepos);
linepos = 0;
} else if (linepos == MAX_LINE_SIZE - 1) {
produceLine(auxline, linepos);
linepos = 0;
} else auxline[linepos++] = buffer[bufpos++];
}
int lastLinePos = linepos; // we need a final variable captured in the next lambda
if (!isCancelled()) readBytes(asyncFile, position, buffer, buffer.length, (err, res) -> {
if (isCancelled())
return;
if (err != null) {
onError(err);
close(asyncFile);
return;
}
if (res <= 0) {
// needed for last line that doesn't end with LF
if (lastLinePos > 0) {
produceLine(auxline, lastLinePos);
}
// Following it will invoke onComplete()
close(asyncFile);
} else {
readLines(asyncFile, position + res, 0, res, buffer, auxline, lastLinePos);
}
});
}
/**
* Performed from the IO background thread when it reached the end of the file.
*
* @param asyncFile
*/
private void close(AsynchronousFileChannel asyncFile) {
try {
asyncFile.close();
} catch (IOException e) {
onError(e); // Failed terminal state.
// Emission has finished. Does not propagate error on CompletableFuture.
} finally {
onComplete();
}
}
/**
* This is called only from readLines() callback and performed from a background IO thread.
*
* @param auxline the transfer buffer.
* @param linepos current position in producing line.
*/
private void produceLine(byte[] auxline, int linepos) {
String line = new String(auxline, 0, linepos, StandardCharsets.UTF_8);
onProduceLine(line);
}
}

20
src/main/java/org/xbib/event/async/AddOnComplete.java
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package org.xbib.event.async;
import org.reactivestreams.Subscriber;
public class AddOnComplete<T> extends SubscriberBuilder<T> {
private final Runnable action;
public AddOnComplete(Runnable action, Subscriber<T> sub) {
super(sub);
this.action = action;
}
@Override
public void onComplete() {
super.onComplete();
action.run();
}
}

30
src/main/java/org/xbib/event/async/AddOnError.java
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package org.xbib.event.async;
import org.reactivestreams.Subscriber;
import java.util.function.Consumer;
public class AddOnError<T> extends SubscriberBuilder<T> implements Subscriber<T> {
private final Consumer<Throwable> cons;
public AddOnError(Consumer<Throwable> cons, Subscriber<T> sub) {
super(sub);
this.cons = cons;
}
@Override
public void onNext(T item) {
try {
super.onNext(item);
} catch (Exception err) {
this.onError(err);
}
}
@Override
public void onError(Throwable throwable) {
super.onError(throwable);
cons.accept(throwable);
}
}

20
src/main/java/org/xbib/event/async/AddOnNext.java
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package org.xbib.event.async;
import org.reactivestreams.Subscriber;
import java.util.function.Consumer;
public class AddOnNext<T> extends SubscriberBuilder<T> implements Subscriber<T> {
private final Consumer<T> cons;
public AddOnNext(Consumer<T> cons) {
super(new EmptySubscriber<>());
this.cons = cons;
}
@Override
public void onNext(T item) {
cons.accept(item);
}
}

22
src/main/java/org/xbib/event/async/AddOnSubscribe.java
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package org.xbib.event.async;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import java.util.function.Consumer;
public class AddOnSubscribe<T> extends SubscriberBuilder<T> implements Subscriber<T> {
private final Consumer<Subscription> cons;
public AddOnSubscribe(Consumer<Subscription> cons, Subscriber<T> sub) {
super(sub);
this.cons = cons;
}
@Override
public void onSubscribe(Subscription subscription) {
super.onSubscribe(subscription);
cons.accept(subscription);
}
}

74
src/main/java/org/xbib/event/async/AsyncFileQuery.java
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package org.xbib.event.async;
import org.xbib.event.yield.AsyncQuery;
import java.io.IOException;
import java.nio.file.Path;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
public class AsyncFileQuery extends AsyncQuery<String> {
private final Path file;
public AsyncFileQuery(Path file) {
this.file = file;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super String, ? super Throwable> cons) {
/*
* The following CF is used bidirectionally from the Reader to the user and vice-versa.
* The Reader may notify the user about end completion and the user may tell the Reader
* to stop read and invoke the callback when the CF is cancelled or completed by the user.
*/
CompletableFuture<Void> cf = new CompletableFuture<>();
try {
ReaderToCallback
.of(cons, () -> {
if (!cf.isDone()) cf.complete(null);
})
.apply(reader -> cf.whenComplete((nothing, err) -> reader.cancel()))
.readLines(file);
} catch (IOException e) {
cf.completeExceptionally(e);
}
return cf;
}
private static class ReaderToCallback extends AbstractAsyncFileReaderLines {
private final BiConsumer<? super String, ? super Throwable> cons;
private final Runnable doOnComplete;
public ReaderToCallback(BiConsumer<? super String, ? super Throwable> cons, Runnable doOnComplete) {
this.cons = cons;
this.doOnComplete = doOnComplete;
}
public static ReaderToCallback of(BiConsumer<? super String, ? super Throwable> cons, Runnable doOnComplete) {
return new ReaderToCallback(cons, doOnComplete);
}
public final AbstractAsyncFileReaderLines apply(Consumer<AbstractAsyncFileReaderLines> cons) {
cons.accept(this);
return this;
}
@Override
public void onProduceLine(String line) {
cons.accept(line, null);
}
@Override
public void onError(Throwable err) {
cons.accept(null, err);
}
@Override
public void onComplete() {
doOnComplete.run();
}
}
}

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src/main/java/org/xbib/event/async/AsyncFileReaderBytes.java
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package org.xbib.event.async;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.CompletionHandler;
import java.util.concurrent.CompletableFuture;
import static java.util.concurrent.CompletableFuture.completedFuture;
public class AsyncFileReaderBytes {
private AsyncFileReaderBytes() {
}
static CompletableFuture<Integer> readAllBytes(
AsynchronousFileChannel asyncFile,
ByteBuffer buffer,
int position,
ByteArrayOutputStream out) {
return readToByteArrayStream(asyncFile, buffer, position, out)
.thenCompose(index ->
index < 0
? completedFuture(position)
: readAllBytes(asyncFile, buffer.clear(), position + index, out));
}
static CompletableFuture<Integer> readToByteArrayStream(
AsynchronousFileChannel asyncFile,
ByteBuffer buffer,
int position,
ByteArrayOutputStream out) {
CompletableFuture<Integer> promise = new CompletableFuture<>();
asyncFile.read(buffer, position, buffer, new CompletionHandler<Integer, ByteBuffer>() {
@Override
public void completed(Integer result, ByteBuffer attachment) {
if (result > 0) {
attachment.flip();
byte[] data = new byte[attachment.limit()]; // limit = result
attachment.get(data);
write(out, data);
}
promise.complete(result);
}
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
promise.completeExceptionally(exc);
}
});
return promise;
}
static void write(ByteArrayOutputStream out, byte[] data) {
try {
out.write(data);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}

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src/main/java/org/xbib/event/async/AsyncFileReaderLines.java
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package org.xbib.event.async;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import java.nio.channels.AsynchronousFileChannel;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Asynchronous non-blocking read operations with a reactive based API
* implementing the Subscription proposal from reactivestreams.
*/
public class AsyncFileReaderLines extends AbstractAsyncFileReaderLines implements Subscription {
//
// We need a reference to the `Subscriber` so we can talk to it.
private final Subscriber<? super String> sub;
//
// We are using this `AtomicBoolean` to make sure that this `Subscription` doesn't run concurrently with itself,
// which would violate rule 1.3 among others (no concurrent notifications).
// Possible states: 0 (not emitting), 1 (emitting lines) and 3 (evaluating conditions requests and lines).
// The onEmit changes from states 0 -> 1 <-> 3 -> 0.
// It never changes from 1 to 0 directly. It must pass before by the state 3.
private final AtomicInteger onEmit = new AtomicInteger(0);
//
// This `ConcurrentLinkedQueue` will track the `onNext` signals that will be sent to the `Subscriber`.
private final ConcurrentLinkedDeque<String> lines = new ConcurrentLinkedDeque<>();
//
// Here we track the current demand, i.e. what has been requested but not yet delivered.
private final AtomicLong requests = new AtomicLong();
//
// Need to keep track of End-of-Stream
private boolean hasNext = true;
AsyncFileReaderLines(Subscriber<? super String> sub, AsynchronousFileChannel asyncFile, int bufferSize) {
this.sub = sub;
this.readLines(asyncFile, bufferSize);
}
@Override
protected void onError(Throwable error) {
sub.onError(error);
}
/**
* Performed from the IO background thread when it reached the end of the file.
*/
@Override
protected void onComplete() {
hasNext = false;
tryFlushPendingLines();
}
/**
* This is called only from readLines() callback and performed from a background IO thread.
*/
@Override
protected void onProduceLine(String line) {
/**
* Always put the newly line into lines because a concurrent request
* may be asking for new lines and we should ensure the total order.
*/
lines.offer(line);
/**
* It only emits lines if subscription is not cancelled yet and there are still
* pending requests.
*/
while (!isCancelled() // This makes sure that rule 1.8 is upheld, i.e. we need to stop signalling "eventually"
&& requests.get() > 0 // This makes sure that rule 1.1 is upheld (sending more than was demanded)
&& !lines.isEmpty()) {
emitLine();
}
}
/**
* Emit a line to the Subscriber and decrement the number of pending requests.
*/
private void emitLine() {
String line = lines.poll();
if (line != null) {
sub.onNext(line);
requests.decrementAndGet();
} else {
terminateDueTo(new IllegalStateException("Unexpected race occur on lines offer. No other thread should concurrently should be taking lines!"));
}
}
/**
* Implementation of `Subscription.request` registers that more elements are in demand.
* This request() only try to emitLines() after the End-of-Stream, in which case we
* should control mutual exclusion to the emitLines().
*
* @param l
*/
@Override
public void request(long l) {
if (isCancelled()) return;
doRequest(l);
if (!hasNext) {
tryFlushPendingLines();
}
}
/**
* This method may be invoked by request() in case of End-of-Stream or by close().
* Here the `onEmit` controls mutual exclusion to the emitLine() call.
*/
private void tryFlushPendingLines() {
int state;
// Spin try for emission entry.
// If it successfully change state from 0 to 1, then it will proceed to try to emit lines.
// It quits if someone else is already emitting lines (in state 1).
// If someone else is evaluating the conditions (state 3) then it will spin and retry.
while ((state = onEmit.compareAndExchange(0, 1)) > 0)
if (state == 1) return; // give up
//
// Start emission (in state 1)
while (toContinue()) {
emitLine();
}
// End emission (in state 3)
// Other thread entering at this moment in request() increments requests and
// this thread does not see the new value of requests and do not emit pending lines.
// Yet, the other thread will spin until onEmit change from 3 to 0 and then
// it will change onEmit to 1 and proceed emitting pending lines.
onEmit.set(0); // release onEmit
if (lines.isEmpty()) {
cancel(); // We need to consider this `Subscription` as cancelled as per rule 1.6
sub.onComplete(); // Then we signal `onComplete` as per rule 1.2 and 1.5
}
}
/**
* Here it will change to state 3 (on evaluation) and then to state 1 (emitting)
* if there are pending requests and lines to be emitted.
*/
private boolean toContinue() {
// First, change to state 3 corresponding to evaluation of requests and lines.
onEmit.set(3);
boolean cont = !isCancelled() // This makes sure that rule 1.8 is upheld, i.e. we need to stop signalling "eventually"
&& requests.get() > 0 // This makes sure that rule 1.1 is upheld (sending more than was demanded)
&& !lines.isEmpty();
// If there are pending requests and lines to be emitted, then change to
// state 1 that it will emit those lines.
if (cont) onEmit.set(1);
return cont;
}
/**
* This method will register inbound demand from our `Subscriber` and validate it against rule 3.9 and rule 3.17
*/
private void doRequest(final long n) {
if (n < 1)
terminateDueTo(new IllegalArgumentException(sub + " violated the Reactive Streams rule 3.9 by requesting a non-positive number of elements."));
else if (requests.get() + n < 1) {
// As governed by rule 3.17, when demand overflows `Long.MAX_VALUE` we treat the signalled demand as "effectively unbounded"
requests.set(Long.MAX_VALUE); // Here we protect from the overflow and treat it as "effectively unbounded"
} else {
requests.addAndGet(n); // Here we record the downstream demand
}
}
/**
* This is a helper method to ensure that we always `cancel` when we signal `onError` as per rule 1.6
*/
private void terminateDueTo(final Throwable t) {
cancel(); // When we signal onError, the subscription must be considered as cancelled, as per rule 1.6
try {
sub.onError(t); // Then we signal the error downstream, to the `Subscriber`
} catch (final Exception t2) { // If `onError` throws an exception, this is a spec violation according to rule 1.9, and all we can do is to log it.
Throwable ex = new IllegalStateException(sub + " violated the Reactive Streams rule 2.13 by throwing an exception from onError.", t2);
Logger.getGlobal().log(Level.SEVERE, "Violated the Reactive Streams rule 2.13", ex);
}
}
}

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src/main/java/org/xbib/event/async/AsyncFileWriter.java
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package org.xbib.event.async;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.CompletionHandler;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.CompletableFuture;
import static java.nio.ByteBuffer.wrap;
import static java.nio.channels.AsynchronousFileChannel.open;
/**
* Asynchronous non-blocking write operations with a {@code CompletableFuture} based API.
* These operations use an underlying {@code AsynchronousFileChannel}.
* All methods are asynchronous including the {@code close()} which chains a continuation
* on last resulting write {@code CompletableFuture} to close the {@code AsyncFileChannel} on completion.
*/
public class AsyncFileWriter implements AutoCloseable {
final AsynchronousFileChannel asyncFile;
/**
* File position after last write operation completion.
*/
private CompletableFuture<Integer> currentPosition = CompletableFuture.completedFuture(0);
public AsyncFileWriter(AsynchronousFileChannel asyncFile) {
this.asyncFile = asyncFile;
}
public AsyncFileWriter(Path file, StandardOpenOption... options) throws IOException {
this(open(file, options));
}
static CompletableFuture<Integer> write(
AsynchronousFileChannel asyncFile,
ByteBuffer buf,
int position) {
CompletableFuture<Integer> promise = new CompletableFuture<>();
asyncFile.write(buf, position, null, new CompletionHandler<Integer, Object>() {
@Override
public void completed(Integer result, Object attachment) {
promise.complete(result);
}
@Override
public void failed(Throwable exc, Object attachment) {
promise.completeExceptionally(exc);
}
});
return promise;
}
public CompletableFuture<Integer> getPosition() {
return currentPosition;
}
/**
* Writes the given String appended with a newline separator
* and returns a CompletableFuture of the final file index
* after the completion of the corresponding write operation.
*/
public CompletableFuture<Integer> writeLine(CharSequence str) {
return write(str + System.lineSeparator());
}
/**
* Writes the given String and returns a CompletableFuture of
* the final file index after the completion of the corresponding
* write operation.
*/
public CompletableFuture<Integer> write(String str) {
return write(str.getBytes());
}
/**
* Writes the given byte array and returns a CompletableFuture of
* the final file index after the completion of the corresponding
* write operation.
*/
public CompletableFuture<Integer> write(byte[] bytes) {
return write(wrap(bytes));
}
/**
* Writes the given byte buffer and returns a CompletableFuture of
* the final file index after the completion of the corresponding
* write operation.
*/
public CompletableFuture<Integer> write(ByteBuffer bytes) {
/*
* Wee need to update currentPosition field to keep track.
* The currentPosition field is used on close() method, which chains
* a continuation to close the AsyncFileChannel.
*/
currentPosition = currentPosition.thenCompose(index -> {
CompletableFuture<Integer> size = write(asyncFile, bytes, index);
return size.thenApply(length -> length + index);
});
return currentPosition;
}
/**
* Asynchronous close operation.
* Chains a continuation on CompletableFuture resulting from last write operation,
* which closes the AsyncFileChannel on completion.
*
* @throws IOException
*/
@Override
public void close() throws IOException {
if (asyncFile != null) {
currentPosition.whenComplete((res, ex) ->
AsyncFiles.closeAfc(asyncFile)
);
}
}
}

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src/main/java/org/xbib/event/async/AsyncFiles.java
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package org.xbib.event.async;
import org.reactivestreams.Publisher;
import org.xbib.event.yield.AsyncQuery;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import static java.nio.channels.AsynchronousFileChannel.open;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Asynchronous non-blocking read and write operations with a reactive based API.
* Read operations return a CompletableFuture with a single String or a Publisher
* of strings corresponding to lines.
* Write methods return a CompletableFuture with the final file index after the
* completion of corresponding write operation.
* These operations use an underlying AsynchronousFileChannel.
*/
public class AsyncFiles {
private AsyncFiles() {
}
public static AsyncQuery<String> asyncQuery(Path file) {
return new AsyncFileQuery(file);
}
/**
* Reads the given file from the beginning using an AsyncFileChannel
* with a ByteBuffer of {@link AbstractAsyncFileReaderLines#BUFFER_SIZE BUFFER_SIZE} capacity.
*/
public static Publisher<String> lines(String file) {
return lines(Paths.get(file));
}
/**
* Reads the given file from the beginning using an AsyncFileChannel
* with a ByteBuffer of {@link AbstractAsyncFileReaderLines#BUFFER_SIZE BUFFER_SIZE} capacity.
*/
public static Publisher<String> lines(Path file) {
return lines(AbstractAsyncFileReaderLines.BUFFER_SIZE, file);
}
/**
* Reads the given file from the beginning using
* an AsyncFileChannel with a ByteBuffer of
* the specified bufferSize capacity.
*/
public static Publisher<String> lines(int bufferSize, String file) {
return lines(bufferSize, Paths.get(file));
}
/**
* Reads the given file from the beginning using
* an AsyncFileChannel with a ByteBuffer of
* the specified bufferSize capacity.
*/
public static Publisher<String> lines(int bufferSize, Path file) {
return lines(bufferSize, file, StandardOpenOption.READ);
}
/**
* Reads the given file from the beginning using
* an AsyncFileChannel with a ByteBuffer of
* the specified bufferSize capacity.
*/
public static Publisher<String> lines(int bufferSize, Path file, StandardOpenOption... options) {
return sub -> {
AsyncFileReaderLines reader = null;
try {
AsynchronousFileChannel asyncFile = open(file, options);
reader = new AsyncFileReaderLines(sub, asyncFile, bufferSize);
} catch (IOException e) {
sub.onSubscribe(reader);
sub.onError(e);
return;
}
sub.onSubscribe(reader);
};
}
/**
* Reads the file from the beginning using an AsyncFileChannel
* with a ByteBuffer of {@link AbstractAsyncFileReaderLines#BUFFER_SIZE BUFFER_SIZE} capacity.
* It automatically closes the underlying AsyncFileChannel when read is complete.
*/
public static CompletableFuture<String> readAll(String file) {
return readAll(Paths.get(file));
}
/**
* A callback based version of readAll().
* Reads the file from the beginning using an AsyncFileChannel
* with a ByteBuffer of {@link AbstractAsyncFileReaderLines#BUFFER_SIZE BUFFER_SIZE} capacity.
* It automatically closes the underlying AsyncFileChannel when read is complete.
*/
public static void readAll(String file, BiConsumer<Throwable, String> callback) {
readAll(file, AbstractAsyncFileReaderLines.BUFFER_SIZE)
.whenComplete((data, err) -> {
if (err != null) callback.accept(err, null);
else callback.accept(null, data);
});
}
/**
* Reads the file from the beginning using
* an AsyncFileChannel with a ByteBuffer of
* the specified bufferSize capacity.
* It automatically closes the underlying AsyncFileChannel
* when read is complete.
*/
public static CompletableFuture<String> readAll(String file, int bufferSize) {
return readAll(Paths.get(file), bufferSize);
}
/**
* Reads the file from the beginning using an AsyncFileChannel
* with a ByteBuffer of {@link AbstractAsyncFileReaderLines#BUFFER_SIZE BUFFER_SIZE} capacity.
* It automatically closes the underlying AsyncFileChannel
* when read is complete.
*/
public static CompletableFuture<String> readAll(Path file) {
return readAll(file, AbstractAsyncFileReaderLines.BUFFER_SIZE);
}
/**
* Reads the file from the beginning using
* an AsyncFileChannel with a ByteBuffer of
* the specified bufferSize capacity.
* It automatically closes the underlying AsyncFileChannel
* when read is complete.
*/
public static CompletableFuture<String> readAll(Path file, int bufferSize) {
return readAllBytes(file, bufferSize)
.thenApply(bytes -> new String(bytes, UTF_8));
}
/**
* Reads all bytes from the beginning of the file using an AsyncFileChannel
* with a ByteBuffer of {@link AbstractAsyncFileReaderLines#BUFFER_SIZE BUFFER_SIZE} capacity.
*/
public static CompletableFuture<byte[]> readAllBytes(Path file) {
return readAllBytes(file, AbstractAsyncFileReaderLines.BUFFER_SIZE);
}
/**
* Reads all bytes from the beginning of the file
* using an AsyncFileChannel with a ByteBuffer of
* the specified bufferSize capacity.
*/
public static CompletableFuture<byte[]> readAllBytes(Path file, int bufferSize, StandardOpenOption... options) {
try {
ByteBuffer buffer = ByteBuffer.allocate(bufferSize);
ByteArrayOutputStream out = new ByteArrayOutputStream();
AsynchronousFileChannel asyncFile = open(file, options);
CompletableFuture<byte[]> bytes = AsyncFileReaderBytes
.readAllBytes(asyncFile, buffer, 0, out)
.thenApply(position -> out.toByteArray());
/*
* Deliberately chained in this way.
* Code smell: If closeAfc throws an Exception it will be lost!
*/
bytes.whenCompleteAsync((pos, ex) -> closeAfc(asyncFile));
return bytes;
} catch (IOException e) {
return CompletableFuture.failedFuture(e);
}
}
/**
* Writes bytes to a file.
* The options parameter specifies how the file is created or opened.
* All bytes in the byte array are written to the file.
* The method ensures that the file is closed when all bytes have been
* written (or an I/O error or other runtime exception is thrown).
* Returns a CompletableFuture with the final file index
* after the completion of the corresponding write operation.
* If an I/O error occurs then it may complete the resulting CompletableFuture
* exceptionally.
*/
public static CompletableFuture<Integer> writeBytes(Path path, byte[] bytes) {
return writeBytes(path, bytes, StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE);
}
/**
* Writes bytes to a file.
* The options parameter specifies how the file is created or opened.
* All bytes in the byte array are written to the file.
* The method ensures that the underlying {@code AsynchronousFileChannel}
* is closed when all bytes have been written (or an I/O error or any other
* runtime exception is thrown).
* Returns a {@code CompletableFuture} with the final file index
* after the completion of the corresponding write operation.
* If an I/O error occurs then it may complete the resulting CompletableFuture
* exceptionally.
*/
public static CompletableFuture<Integer> writeBytes(Path path, byte[] bytes, StandardOpenOption... options) {
try (AsyncFileWriter writer = new AsyncFileWriter(path, options)) {
writer.write(bytes);
// The call to writer.close() is asynchronous and will chain
// a continuation to close the AsyncFileChannel only after completion.
return writer.getPosition();
} catch (IOException e) {
return CompletableFuture.failedFuture(e);
}
}
/**
* Write lines of text to a file. Each line is a char sequence and
* is written to the file in sequence with each line terminated by
* the platform's line separator, as defined by the system property
* line.separator.
* Returns a CompletableFuture with the final file index
* after the completion of the corresponding write operation.
*/
public static CompletableFuture<Integer> write(Path path, Iterable<? extends CharSequence> lines) {
return write(path, lines, StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE);
}
/**
* Write lines of text to a file. Each line is a char sequence and
* is written to the file in sequence with each line terminated by
* the platform's line separator, as defined by the system property
* line.separator.
* Returns a {@code CompletableFuture} with the final file index
* after the completion of the corresponding write operation.
*/
public static CompletableFuture<Integer> write(Path path, Iterable<? extends CharSequence> lines, StandardOpenOption... options) {
try (AsyncFileWriter writer = new AsyncFileWriter(path, options)) {
lines.forEach(writer::writeLine);
// The call to writer.close() is asynchronous and will chain
// a continuation to close the AsyncFileChannel only after completion.
return writer.getPosition();
} catch (Exception e) {
return CompletableFuture.failedFuture(e);
}
}
static void closeAfc(AsynchronousFileChannel asyncFile) {
try {
asyncFile.close();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}

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src/main/java/org/xbib/event/async/EmptySubscriber.java
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package org.xbib.event.async;
import org.reactivestreams.Subscription;
/**
* For subscribers pipeline composition.
* This should the leaf of the pipeline.
* This avoids to check if next is null.
*
* @param <T>
*/
public class EmptySubscriber<T> implements org.reactivestreams.Subscriber<T> {
@Override
public void onSubscribe(Subscription subscription) {
}
@Override
public void onNext(T t) {
}
@Override
public void onError(Throwable throwable) {
}
@Override
public void onComplete() {
}
}

47
src/main/java/org/xbib/event/async/SubscriberBuilder.java
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package org.xbib.event.async;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import java.util.function.Consumer;
public class SubscriberBuilder<T> implements Subscriber<T> {
private final Subscriber<T> sub;
public SubscriberBuilder(Subscriber<T> sub) {
this.sub = sub;
}
public SubscriberBuilder<T> doOnSubscribe(Consumer<Subscription> cons) {
return new AddOnSubscribe<>(cons, this);
}
public SubscriberBuilder<T> doOnError(Consumer<Throwable> cons) {
return new AddOnError<>(cons, this);
}
public SubscriberBuilder<T> doOnComplete(Runnable action) {
return new AddOnComplete<>(action, this);
}
@Override
public void onSubscribe(Subscription subscription) {
sub.onSubscribe(subscription);
}
@Override
public void onNext(T item) {
sub.onNext(item);
}
@Override
public void onError(Throwable throwable) {
sub.onError(throwable);
}
@Override
public void onComplete() {
sub.onComplete();
}
}

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src/main/java/org/xbib/event/async/Subscribers.java
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package org.xbib.event.async;
import java.util.function.Consumer;
public class Subscribers {
private Subscribers() {
}
public static <T> SubscriberBuilder<T> doOnNext(Consumer<T> cons) {
return new AddOnNext<>(cons);
}
}

12
src/main/java/org/xbib/event/clock/ClockEvent.java
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package org.xbib.event.clock;
import org.xbib.event.Event;
import java.time.Instant;
public interface ClockEvent extends Event {
void setInstant(Instant instant);
Instant getInstant();
}

18
src/main/java/org/xbib/event/clock/ClockEventConsumer.java
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package org.xbib.event.clock;
import com.google.common.eventbus.AllowConcurrentEvents;
import com.google.common.eventbus.Subscribe;
import org.xbib.event.EventConsumer;
import java.util.logging.Logger;
public class ClockEventConsumer implements EventConsumer {
private static final Logger logger = Logger.getLogger(ClockEventConsumer.class.getName());
@Subscribe
@AllowConcurrentEvents
void onEvent(ClockEvent event) {
logger.info("received demo clock event, instant = " + event.getInstant());
}
}

61
src/main/java/org/xbib/event/clock/ClockEventManager.java
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package org.xbib.event.clock;
import com.google.common.eventbus.EventBus;
import org.xbib.settings.Settings;
import org.xbib.time.schedule.CronExpression;
import org.xbib.time.schedule.CronSchedule;
import java.io.Closeable;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.logging.Logger;
public class ClockEventManager implements Closeable {
private static final Logger logger = Logger.getLogger(ClockEventManager.class.getName());
private final CronSchedule<Integer> cronSchedule;
public ClockEventManager(Settings settings,
EventBus eventBus,
ClassLoader classLoader) {
ThreadFactory threadFactory = new ThreadFactory() {
int n = 1;
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "malva-clockevent-" + (n++));
}
};
ScheduledExecutorService executorService =
Executors.newScheduledThreadPool(settings.getAsInt("pool.size", 2), threadFactory);
this.cronSchedule = new CronSchedule<>(executorService);
for (Map.Entry<String,Settings> cronjobs : settings.getGroups("clock").entrySet()) {
Settings entrySettings = cronjobs.getValue();
if (entrySettings.getAsBoolean("enabled", true)) {
String entry = entrySettings.get("entry");
if (entry != null) {
String className = entrySettings.get("class", ClockEvent.class.getName());
try {
@SuppressWarnings("unchecked")
Class<? extends ClockEvent> eventClass = (Class<? extends ClockEvent>) classLoader.loadClass(className);
cronSchedule.add(className, CronExpression.parse(entry), new ClockEventService(eventBus, eventClass));
logger.info("cron job " + cronjobs.getKey() +
" scheduled on " + entry +
", event class " + className);
} catch (Exception e) {
logger.warning("unable to schedule cron job " + cronjobs.getKey() + ", reason " + e.getMessage());
}
}
}
}
cronSchedule.start();
}
@Override
public void close() throws IOException {
cronSchedule.close();
}
}

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src/main/java/org/xbib/event/clock/ClockEventService.java
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package org.xbib.event.clock;
import com.google.common.eventbus.EventBus;
import java.time.Instant;
import java.util.concurrent.Callable;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ClockEventService implements Callable<Integer> {
private static final Logger logger = Logger.getLogger(ClockEventService.class.getName());
private final EventBus eventBus;
private final Class<? extends ClockEvent> eventClass;
public ClockEventService(EventBus eventBus,
Class<? extends ClockEvent> eventClass) {
this.eventBus = eventBus;
this.eventClass = eventClass;
}
@Override
public Integer call() throws Exception {
try {
logger.log(Level.FINE, "posting clock event " + eventClass.getName());
ClockEvent clockEvent = eventClass.getDeclaredConstructor().newInstance();
clockEvent.setInstant(Instant.now());
eventBus.post(clockEvent);
return 0;
} catch (Throwable t) {
logger.log(Level.WARNING, t.getMessage(), t);
return 1;
}
}
}

80
src/main/java/org/xbib/event/persistence/AbstractPersistenceStore.java
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package org.xbib.event.persistence;
import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
@SuppressWarnings("serial")
public class AbstractPersistenceStore extends LinkedHashMap<String, Object>
implements PersistenceStore<String, Object> {
private final Durability durability;
private final Codec<Map<String, Object>> codec;
private final String storeName;
public AbstractPersistenceStore(Codec<Map<String, Object>> codec,
Durability durability,
String storeName) {
super();
this.codec = codec;
this.durability = durability;
this.storeName = storeName;
}
@Override
public Durability getDurability() {
return durability;
}
@Override
public Codec<Map<String, Object>> getCodec() {
return codec;
}
@Override
public void load() throws IOException {
clear();
Map<String, Object> map = codec.read(storeName);
if (map != null) {
putAll(map);
}
}
@Override
public void begin() {
// ignore
}
@Override
public void commit() throws IOException {
codec.write(storeName, this);
}
@Override
public void rollback() {
// ignore
}
@SuppressWarnings("unchecked")
@Override
public void insert(String key, Object value) throws IOException {
putIfAbsent(key, new ArrayList<>());
List<Object> list = (List<Object>) get(key);
list.add(value);
put(key, list);
commit();
}
@SuppressWarnings("unchecked")
void remove(String key, Object value) throws IOException {
putIfAbsent(key, new ArrayList<>());
List<Object> list = (List<Object>) get(key);
list.remove(value);
put(key, list);
commit();
}
}

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src/main/java/org/xbib/event/persistence/Codec.java
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package org.xbib.event.persistence;
import java.io.IOException;
public interface Codec<D> {
D read(String key) throws IOException;
void write(String key, D data) throws IOException;
}

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src/main/java/org/xbib/event/persistence/Durability.java
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package org.xbib.event.persistence;
public enum Durability {
VOLATILE, EXPLICIT, CONTAINER_LIFETIME, APPLICATION_LIFETIME, PERMANENT
}

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src/main/java/org/xbib/event/persistence/FileJsonCodec.java
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package org.xbib.event.persistence;
import org.xbib.datastructures.json.tiny.Json;
import java.io.IOException;
import java.io.Writer;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class FileJsonCodec implements Codec<Map<String, Object>> {
private final URI uri;
private final ReentrantReadWriteLock readWriteLock;
public FileJsonCodec(URI uri) {
this.uri = uri;
this.readWriteLock = new ReentrantReadWriteLock();
}
@Override
public Map<String, Object> read(String key) throws IOException {
try {
readWriteLock.readLock().lock();
Path p = openOrCreate(key);
return Files.exists(p) ? Json.toMap(Files.newBufferedReader(p)) : null;
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public void write(String key, Map<String, Object> data) throws IOException {
try {
readWriteLock.writeLock().lock();
Path p = openOrCreate(key);
try (Writer writer = Files.newBufferedWriter(p)) {
writer.write(Json.toString(data));
}
} finally {
readWriteLock.writeLock().unlock();
}
}
private Path openOrCreate(String key) throws IOException {
Path path = Paths.get(uri);
Files.createDirectories(path);
return path.resolve(key);
}
}

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src/main/java/org/xbib/event/persistence/FilePersistenceStore.java
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package org.xbib.event.persistence;
import org.xbib.settings.Settings;
import java.net.URI;
import java.util.Map;
@SuppressWarnings("serial")
public class FilePersistenceStore extends AbstractPersistenceStore {
public FilePersistenceStore(Settings settings, String name) {
this(URI.create(settings.get("store.uri", "file:///var/tmp/malva/store")),
Durability.valueOf(settings.get("store.durability", "PERMANENT")),
settings.get("store.name", name));
}
public FilePersistenceStore(URI uri, Durability durability, String storeName) {
this(new FileJsonCodec(uri), durability, storeName);
}
public FilePersistenceStore(Codec<Map<String, Object>> codec, Durability durability, String storeName) {
super(codec, durability, storeName);
}
}

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src/main/java/org/xbib/event/persistence/PersistenceStore.java
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package org.xbib.event.persistence;
import java.io.IOException;
import java.util.Map;
public interface PersistenceStore<K, V> extends Map<K, V> {
Durability getDurability();
Codec<Map<K, V>> getCodec();
void insert(K k, V v) throws IOException;
void load() throws IOException;
void begin();
void commit() throws IOException;
void rollback();
}

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src/main/java/org/xbib/event/queue/QueueEvent.java
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package org.xbib.event.queue;
import org.xbib.event.Event;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.FileTime;
import java.time.Instant;
import java.util.Map;
public class QueueEvent implements Event {
private String key;
private Map<String, Object> map;
@Override
public void setKey(String key) {
this.key = key;
}
@Override
public String getKey() {
return key;
}
@Override
public void setMap(Map<String, Object> map) {
this.map = map;
}
@Override
public Map<String, Object> getMap() {
return map;
}
}

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src/main/java/org/xbib/event/queue/path/simple/PathQueueEvent.java
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package org.xbib.event.queue.path.simple;
import org.xbib.event.queue.QueueEvent;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.FileTime;
import java.time.Instant;
public class PathQueueEvent extends QueueEvent {
static final String INCOMING = "incoming";
static final String SUCCESS = "success";
static final String FAIL = "fail";
private Path path;
private Path file;
private String suffix;
public void setFile(Path file) {
this.file = file;
}
public Path getFile() {
return file;
}
public void setPath(Path path) {
this.path = path;
}
public Path getPath() {
return path;
}
public void setSuffix(String suffix) {
this.suffix = suffix;
}
public String getSuffix() {
return suffix;
}
public void success() throws IOException {
Files.setLastModifiedTime(file, FileTime.from(Instant.now()));
Files.move(file, path.resolve(SUCCESS).resolve(file.getFileName()).toAbsolutePath(),
StandardCopyOption.REPLACE_EXISTING);
}
public void fail() throws IOException {
Files.setLastModifiedTime(file, FileTime.from(Instant.now()));
Files.move(file, path.resolve(FAIL).resolve(file.getFileName()).toAbsolutePath(),
StandardCopyOption.REPLACE_EXISTING);
}
}

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src/main/java/org/xbib/event/queue/path/simple/PathQueueEventManager.java
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package org.xbib.event.queue.path.simple;
import com.google.common.eventbus.EventBus;
import org.xbib.datastructures.api.TimeValue;
import org.xbib.datastructures.json.tiny.Json;
import org.xbib.settings.Settings;
import java.io.IOException;
import java.io.Writer;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.time.Instant;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Stream;
public class PathQueueEventManager {
private static final Logger logger = Logger.getLogger(PathQueueEventManager.class.getName());
private final Settings settings;
private final Path path;
private final Map<Path, PathQueueEventService> pathEventServiceMap;
@SuppressWarnings("unchecked")
public PathQueueEventManager(Settings settings,
EventBus eventBus,
ClassLoader classLoader) {
this.settings = settings;
this.pathEventServiceMap = new LinkedHashMap<>();
this.path = Paths.get(settings.get("path", "/var/tmp/default/queues"));
for (Map.Entry<String, Settings> entry : settings.getGroups("queues").entrySet()) {
String name = entry.getKey();
Settings definition = entry.getValue();
String eventClassName = definition.get("class");
if (eventClassName == null) {
throw new IllegalArgumentException("no path event class name given for path event manager at " + path);
}
try {
Class<? extends PathQueueEvent> eventClass = (Class<? extends PathQueueEvent>) classLoader.loadClass(eventClassName);
Path p = path.resolve(name);
if (!Files.exists(p)) {
logger.log(Level.INFO, "creating queue " + name + " at " + p);
Files.createDirectories(p);
}
for (String string : List.of(PathQueueEvent.INCOMING, PathQueueEvent.SUCCESS, PathQueueEvent.FAIL)) {
Path dir = p.resolve(string);
if (!Files.exists(dir)) {
logger.log(Level.INFO, "creating queue " + name + " dir = " + dir);
Files.createDirectories(dir);
}
}
if (!pathEventServiceMap.containsKey(p)) {
int maxFileSize = settings.getAsInt("maxfilesize", 10 * 1024 * 1024); // max. 10 MB
logger.log(Level.INFO, "creating path event service on " + p + " with class " + eventClassName + " max file size = " + maxFileSize);
PathQueueEventService pathEventService = new PathQueueEventService(eventBus, p, maxFileSize, eventClass);
pathEventServiceMap.put(p, pathEventService);
}
} catch (Exception e) {
logger.log(Level.WARNING, "unable to create path event service " + eventClassName + " reason " + e.getMessage());
}
}
logger.log(Level.INFO, pathEventServiceMap.size() + " path event services initialized");
}
public boolean put(String queue, String key, Map<String,Object> map) throws IOException {
String keyFileName = key + ".json";
Path queuePath = path.resolve(queue);
if (Files.exists(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName)) ||
Files.exists(queuePath.resolve(PathQueueEvent.SUCCESS).resolve(keyFileName))) {
logger.log(Level.WARNING, "key " + key + " already exists");
return false;
}
Path file = queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName);
try (Writer writer = Files.newBufferedWriter(file)) {
writer.write(Json.toString(map));
}
pathEventServiceMap.get(queuePath).postEvent(key, file);
purge(queue);
return true;
}
public boolean put(String queue, String key, String value) throws IOException {
String keyFileName = key + ".txt";
Path queuePath = path.resolve(queue);
if (Files.exists(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName)) ||
Files.exists(queuePath.resolve(PathQueueEvent.SUCCESS).resolve(keyFileName))) {
logger.log(Level.WARNING, "key " + key + " already exists");
return false;
}
Path file = queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName);
try (Writer writer = Files.newBufferedWriter(file)) {
writer.write(value);
}
pathEventServiceMap.get(queuePath).postEvent(key, file);
purge(queue);
return true;
}
public boolean exists(String queue, String key) {
String keyFileName = key + ".json";
Path queuePath = path.resolve(queue);
return Files.exists(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName)) ||
Files.exists(queuePath.resolve(PathQueueEvent.SUCCESS).resolve(keyFileName));
}
public long sizeOfIncoming(String queue) throws IOException {
Path queuePath = path.resolve(queue);
Path incomingPath = queuePath.resolve(PathQueueEvent.INCOMING);
return sizeOf(incomingPath);
}
public long sizeOfSuccess(String queue) throws IOException {
Path queuePath = path.resolve(queue);
Path successPath = queuePath.resolve(PathQueueEvent.SUCCESS);
return sizeOf(successPath);
}
public static long sizeOf(Path path) throws IOException {
Stream<Path> stream = Files.find(path, 1, (p, basicFileAttributes) -> Files.isRegularFile(p));
return stream.count();
}
public void purge(String queue) throws IOException {
List<String> purgeQueues = Arrays.asList(settings.getAsArray("purge"));
if (purgeQueues.contains(queue)) {
TimeValue lifetime = settings.getAsTime("lifetime", TimeValue.timeValueHours(72));
Path queuePath = path.resolve(queue);
Files.walkFileTree(queuePath, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (Instant.now().minusMillis(attrs.lastModifiedTime().toMillis()).toEpochMilli() > lifetime.millis()) {
logger.log(Level.WARNING, "lifetime " + lifetime + " exceeded, deleting " + file);
Files.delete(file);
}
return FileVisitResult.CONTINUE;
}
});
}
}
}

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src/main/java/org/xbib/event/queue/path/simple/PathQueueEventService.java
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package org.xbib.event.queue.path.simple;
import com.google.common.eventbus.EventBus;
import org.xbib.datastructures.json.tiny.Json;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.InvocationTargetException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.LinkedHashMap;
import java.util.Objects;
import java.util.logging.Level;
import java.util.logging.Logger;
import static org.xbib.event.queue.path.simple.PathQueueEvent.INCOMING;
public class PathQueueEventService {
private static final Logger logger = Logger.getLogger(PathQueueEventService.class.getName());
private final EventBus eventBus;
private final Path path;
private final int maxFileSize;
private final Class<? extends PathQueueEvent> pathEventClass;
private int eventCount;
public PathQueueEventService(EventBus eventBus,
Path path,
int maxFileSize,
Class<? extends PathQueueEvent> pathEventClass) throws IOException {
this.eventBus = eventBus;
this.path = path;
this.maxFileSize = maxFileSize;
this.pathEventClass = pathEventClass;
drainIncoming();
logger.log(Level.INFO, "at startup: watch service created for incoming files at " + path +
"max file size = " + maxFileSize);
}
private void drainIncoming() throws IOException {
try (DirectoryStream<Path> directoryStream = Files.newDirectoryStream(path.resolve(INCOMING))) {
directoryStream.forEach(path -> {
if (Files.isRegularFile(path)) {
String key = path.getFileName().toString();
logger.log(Level.INFO, "while draining found key=" + key + " path=" + path);
try {
postEvent(key, path);
} catch (IOException e) {
logger.log(Level.SEVERE, e.getMessage(), e);
}
}
});
}
}
public void postEvent(String key, Path file) throws IOException {
String base = getBase(key);
String suffix = getSuffix(key);
PathQueueEvent event;
try {
event = pathEventClass.getConstructor().newInstance();
} catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
logger.log(Level.SEVERE, e.getMessage(), e);
return;
}
event.setKey(base);
event.setFile(file);
event.setSuffix(suffix);
event.setMap(new LinkedHashMap<>());
event.setPath(path); // remember directory for fail() and success()
long fileSize = Files.size(file);
if (fileSize < maxFileSize && Objects.equals(suffix, "json")) {
// we read only small JSON files
try (Reader reader = Files.newBufferedReader(file)) {
event.setMap(Json.toMap(reader));
} catch (Exception e) {
logger.log(Level.WARNING, e.getMessage(), e);
}
logger.log(Level.INFO, "posting new event =" + event.getClass() + " " + event);
eventBus.post(event);
eventCount++;
} else {
logger.log(Level.SEVERE, "skipping post event because incoming file is too large, max file size = " + maxFileSize);
}
}
public static String getBase(String name) {
int pos = name.lastIndexOf('.');
return pos >= 0 ? name.substring(0, pos) : name;
}
public static String getSuffix(String name) {
int pos = name.lastIndexOf('.');
return pos >= 0 ? name.substring(pos + 1) : null;
}
}

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src/main/java/org/xbib/event/queue/path/watch/PathQueueEvent.java
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package org.xbib.event.queue.path.watch;
import org.xbib.event.queue.QueueEvent;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.FileTime;
import java.time.Instant;
public class PathQueueEvent extends QueueEvent {
static final String INCOMING = "incoming";
static final String SUCCESS = "success";
static final String FAIL = "fail";
private Path path;
private Path file;
private String suffix;
public void setFile(Path file) {
this.file = file;
}
public Path getFile() {
return file;
}
public void setPath(Path path) {
this.path = path;
}
public Path getPath() {
return path;
}
public void setSuffix(String suffix) {
this.suffix = suffix;
}
public String getSuffix() {
return suffix;
}
public void success() throws IOException {
Files.setLastModifiedTime(file, FileTime.from(Instant.now()));
Files.move(file, path.resolve(SUCCESS).resolve(file.getFileName()).toAbsolutePath(),
StandardCopyOption.REPLACE_EXISTING);
}
public void fail() throws IOException {
Files.setLastModifiedTime(file, FileTime.from(Instant.now()));
Files.move(file, path.resolve(FAIL).resolve(file.getFileName()).toAbsolutePath(),
StandardCopyOption.REPLACE_EXISTING);
}
}

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src/main/java/org/xbib/event/queue/path/watch/PathQueueEventManager.java
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package org.xbib.event.queue.path.watch;
import com.google.common.eventbus.EventBus;
import org.xbib.datastructures.api.TimeValue;
import org.xbib.datastructures.json.tiny.Json;
import org.xbib.settings.Settings;
import java.io.Closeable;
import java.io.IOException;
import java.io.Writer;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Stream;
public class PathQueueEventManager implements Closeable {
private static final Logger logger = Logger.getLogger(PathQueueEventManager.class.getName());
private final Settings settings;
private final Path path;
private final List<Future<?>> futures;
private final Map<Path, PathQueueEventService> pathEventServiceMap;
@SuppressWarnings("unchecked")
public PathQueueEventManager(Settings settings,
EventBus eventBus,
ExecutorService executorService,
ClassLoader classLoader) {
this.settings = settings;
this.futures = new ArrayList<>();
this.pathEventServiceMap = new LinkedHashMap<>();
this.path = Paths.get(settings.get("path", "/var/tmp/default/queues"));
for (Map.Entry<String, Settings> entry : settings.getGroups("queues").entrySet()) {
String name = entry.getKey();
Settings definition = entry.getValue();
String eventClassName = definition.get("class");
if (eventClassName == null) {
throw new IllegalArgumentException("no path event class name given for path event manager at " + path);
}
try {
Class<? extends PathQueueEvent> eventClass = (Class<? extends PathQueueEvent>) classLoader.loadClass(eventClassName);
Path p = path.resolve(name);
if (!Files.exists(p)) {
logger.log(Level.INFO, "creating queue " + name + " at " + p);
Files.createDirectories(p);
}
for (String string : List.of(PathQueueEvent.INCOMING, PathQueueEvent.SUCCESS, PathQueueEvent.FAIL)) {
Path dir = p.resolve(string);
if (!Files.exists(dir)) {
logger.log(Level.INFO, "creating queue " + name + " dir = " + dir);
Files.createDirectories(dir);
}
}
if (!pathEventServiceMap.containsKey(p)) {
int maxFileSize = settings.getAsInt("maxfilesize", 10 * 1024 * 1024); // max. 10 MB
logger.log(Level.INFO, "creating path event service on " + p + " with class " + eventClassName + " max file size = " + maxFileSize);
PathQueueEventService pathEventService = new PathQueueEventService(eventBus, p, maxFileSize, eventClass);
pathEventServiceMap.put(p, pathEventService);
futures.add(executorService.submit(pathEventService));
}
} catch (Exception e) {
logger.log(Level.WARNING, "unable to create path event service " + eventClassName + " reason " + e.getMessage());
}
}
logger.log(Level.INFO, pathEventServiceMap.size() + " path event services initialized");
}
public boolean put(String queue, String key, Map<String,Object> map) throws IOException {
String keyFileName = key + ".json";
Path queuePath = path.resolve(queue);
if (Files.exists(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName)) ||
Files.exists(queuePath.resolve(PathQueueEvent.SUCCESS).resolve(keyFileName))) {
logger.log(Level.WARNING, "key " + key + " already exists");
return false;
}
try (Writer writer = Files.newBufferedWriter(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName))) {
writer.write(Json.toString(map));
}
purge(queue);
return true;
}
public boolean put(String queue, String key, String value) throws IOException {
String keyFileName = key + ".txt";
Path queuePath = path.resolve(queue);
if (Files.exists(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName)) ||
Files.exists(queuePath.resolve(PathQueueEvent.SUCCESS).resolve(keyFileName))) {
logger.log(Level.WARNING, "key " + key + " already exists");
return false;
}
try (Writer writer = Files.newBufferedWriter(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName))) {
writer.write(value);
}
purge(queue);
return true;
}
public boolean exists(String queue, String key) {
String keyFileName = key + ".json";
Path queuePath = path.resolve(queue);
return Files.exists(queuePath.resolve(PathQueueEvent.INCOMING).resolve(keyFileName)) ||
Files.exists(queuePath.resolve(PathQueueEvent.SUCCESS).resolve(keyFileName));
}
public long sizeOfIncoming(String queue) throws IOException {
Path queuePath = path.resolve(queue);
Path incomingPath = queuePath.resolve(PathQueueEvent.INCOMING);
return sizeOf(incomingPath);
}
public long sizeOfSuccess(String queue) throws IOException {
Path queuePath = path.resolve(queue);
Path successPath = queuePath.resolve(PathQueueEvent.SUCCESS);
return sizeOf(successPath);
}
public static long sizeOf(Path path) throws IOException {
Stream<Path> stream = Files.find(path, 1, (p, basicFileAttributes) -> Files.isRegularFile(p));
return stream.count();
}
public void purge(String queue) throws IOException {
List<String> purgeQueues = Arrays.asList(settings.getAsArray("purge"));
if (purgeQueues.contains(queue)) {
TimeValue lifetime = settings.getAsTime("lifetime", TimeValue.timeValueHours(72));
Path queuePath = path.resolve(queue);
Files.walkFileTree(queuePath, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (Instant.now().minusMillis(attrs.lastModifiedTime().toMillis()).toEpochMilli() > lifetime.millis()) {
logger.log(Level.WARNING, "lifetime " + lifetime + " exceeded, deleting " + file);
Files.delete(file);
}
return FileVisitResult.CONTINUE;
}
});
}
}
@Override
public void close() throws IOException {
logger.log(Level.INFO, "closing all path event services");
for (PathQueueEventService service : pathEventServiceMap.values()) {
logger.log(Level.INFO, "closing path event service " + service);
service.close();
}
for (Future<?> future : futures) {
future.cancel(true);
}
}
}

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src/main/java/org/xbib/event/queue/path/watch/PathQueueEventService.java
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package org.xbib.event.queue.path.watch;
import com.google.common.eventbus.EventBus;
import org.xbib.datastructures.json.tiny.Json;
import java.io.Closeable;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.InvocationTargetException;
import java.nio.file.ClosedWatchServiceException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardWatchEventKinds;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.util.LinkedHashMap;
import java.util.Objects;
import java.util.concurrent.Callable;
import java.util.logging.Level;
import java.util.logging.Logger;
import static org.xbib.event.queue.path.watch.PathQueueEvent.INCOMING;
public class PathQueueEventService implements Callable<Integer>, Closeable {
private static final Logger logger = Logger.getLogger(PathQueueEventService.class.getName());
private final EventBus eventBus;
private final Path path;
private final int maxFileSize;
private final Class<? extends PathQueueEvent> pathEventClass;
private final WatchService watchService;
private int eventCount;
private volatile boolean keepWatching;
public PathQueueEventService(EventBus eventBus,
Path path,
int maxFileSize,
Class<? extends PathQueueEvent> pathEventClass) throws IOException {
this.eventBus = eventBus;
this.path = path;
this.maxFileSize = maxFileSize;
this.pathEventClass = pathEventClass;
drainIncoming();
this.watchService = path.getFileSystem().newWatchService();
WatchEvent.Kind<?>[] kinds = new WatchEvent.Kind<?>[] { StandardWatchEventKinds.ENTRY_CREATE };
WatchKey watchKey = path.resolve(INCOMING).register(watchService, kinds);
keepWatching = true;
logger.log(Level.INFO, "at startup: watch service created for incoming files at " + path +
"max file size = " + maxFileSize);
}
@Override
public Integer call() {
try {
logger.log(Level.INFO, "watch service running on " + path.resolve(INCOMING));
while (keepWatching && watchService != null) {
WatchKey watchKey = watchService.take();
logger.log(Level.FINE, "received a watch key " + watchKey);
for (WatchEvent<?> watchEvent : watchKey.pollEvents()) {
WatchEvent.Kind<?> kind = watchEvent.kind();
if (kind == StandardWatchEventKinds.OVERFLOW) {
continue;
}
// we sleep here a bit, to give time to the OS to complete file writing
Thread.sleep(1000L);
@SuppressWarnings("unchecked")
WatchEvent<Path> pathWatchEvent = (WatchEvent<Path>) watchEvent;
String watchEventContext = pathWatchEvent.context().toString();
Path p = path.resolve(INCOMING).resolve(watchEventContext);
logger.log(Level.FINE, "watch event" + pathWatchEvent + " key=" + watchEventContext + " path=" + p);
postEvent(watchEventContext, p);
}
watchKey.reset();
}
} catch (ClosedWatchServiceException e) {
logger.log(Level.FINE, "closed watch key");
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
logger.log(Level.FINE, "interrupted: " + e.getMessage());
} catch (Exception e) {
logger.log(Level.SEVERE, e.getMessage(), e);
}
return eventCount;
}
@Override
public void close() throws IOException {
keepWatching = false;
if (watchService != null) {
logger.log(Level.FINE, "closing watch service " + watchService);
watchService.close();
}
}
private void drainIncoming() throws IOException {
try (DirectoryStream<Path> directoryStream = Files.newDirectoryStream(path.resolve(INCOMING))) {
directoryStream.forEach(path -> {
if (Files.isRegularFile(path)) {
String key = path.getFileName().toString();
logger.log(Level.INFO, "while draining found key=" + key + " path=" + path);
try {
postEvent(key, path);
} catch (IOException | NoSuchMethodException | InvocationTargetException | InstantiationException | IllegalAccessException e) {
logger.log(Level.SEVERE, e.getMessage(), e);
}
}
});
}
}
private void postEvent(String key, Path file)
throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, IOException {
String base = getBase(key);
String suffix = getSuffix(key);
PathQueueEvent event = pathEventClass.getConstructor().newInstance();
event.setKey(base);
event.setFile(file);
event.setSuffix(suffix);
event.setMap(new LinkedHashMap<>());
event.setPath(path); // remember directory for fail() and success()
long fileSize = Files.size(file);
if (fileSize < maxFileSize && Objects.equals(suffix, "json")) {
// we read only small JSON files
try (Reader reader = Files.newBufferedReader(file)) {
event.setMap(Json.toMap(reader));
} catch (Exception e) {
logger.log(Level.WARNING, e.getMessage(), e);
}
logger.log(Level.INFO, "posting new event =" + event.getClass() + " " + event);
eventBus.post(event);
eventCount++;
} else {
logger.log(Level.SEVERE, "skipping post event because incoming file is too large, max file size = " + maxFileSize);
}
}
public static String getBase(String name) {
int pos = name.lastIndexOf('.');
return pos >= 0 ? name.substring(0, pos) : name;
}
public static String getSuffix(String name) {
int pos = name.lastIndexOf('.');
return pos >= 0 ? name.substring(pos + 1) : null;
}
}

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src/main/java/org/xbib/event/timer/TimerEvent.java
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package org.xbib.event.timer;
import org.xbib.event.Event;
import java.time.Instant;
public interface TimerEvent extends Event {
void setInstant(Instant instant);
Instant getInstant();
}

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src/main/java/org/xbib/event/timer/TimerEventManager.java
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package org.xbib.event.timer;
import com.google.common.eventbus.EventBus;
import org.xbib.event.persistence.FilePersistenceStore;
import org.xbib.event.persistence.PersistenceStore;
import org.xbib.settings.Settings;
import org.xbib.time.chronic.Chronic;
import org.xbib.time.chronic.Span;
import java.io.Closeable;
import java.io.IOException;
import java.text.ParseException;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
public class TimerEventManager implements Closeable {
private static final Logger logger = Logger.getLogger(TimerEventManager.class.getName());
private final Map<String, TimerEventService> services;
@SuppressWarnings("unchecked")
public TimerEventManager(Settings settings,
EventBus eventBus,
ClassLoader classLoader,
ZoneId zoneId) {
this.services = new LinkedHashMap<>();
for (Map.Entry<String, Settings> entry : settings.getGroups("timer").entrySet()) {
String name = entry.getKey();
Settings timerSettings = entry.getValue();
String className = timerSettings.get("class", TimerEvent.class.getName());
try {
Class<? extends TimerEvent> eventClass = (Class<? extends TimerEvent>) classLoader.loadClass(className);
PersistenceStore<String, Object> persistenceStore = new FilePersistenceStore(timerSettings, name);
services.put(name, new TimerEventService(eventBus, name, eventClass, zoneId, persistenceStore));
logger.log(Level.INFO, "timer " + name + " active for timer event class " + className);
} catch (Exception e) {
logger.log(Level.WARNING, "unable to activate timer " + name + ", reason " + e.getMessage());
}
}
}
public boolean put(String key, String timeSpec, Map<String,Object> map) throws ParseException, IOException {
if (services.containsKey(key)) {
Span span = Chronic.parse(timeSpec);
if (span != null) {
ZonedDateTime zonedDateTime = span.getBeginCalendar();
services.get(key).schedule(zonedDateTime.toInstant(), map);
logger.log(Level.INFO, "scheduled to " + zonedDateTime);
} else {
logger.log(Level.INFO, "timer event key " + key + ": can not understand time spec " + timeSpec);
return false;
}
return true;
} else {
logger.log(Level.SEVERE, "unknown timer event key: " + key);
}
return false;
}
public boolean put(String key, Instant instant, Map<String,Object> map) throws IOException {
if (services.containsKey(key)) {
services.get(key).schedule(instant, map);
return true;
} else {
logger.log(Level.SEVERE, "unknown timer event key: " + key);
}
return false;
}
public void purge() {
for (Map.Entry<String, TimerEventService> entry : services.entrySet()) {
logger.log(Level.INFO, "purging timer " + entry.getKey());
entry.getValue().purge();
}
}
@Override
public void close() throws IOException {
for (Map.Entry<String, TimerEventService> entry : services.entrySet()) {
logger.log(Level.INFO, "closing timer " + entry.getKey());
entry.getValue().close();
}
}
}

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src/main/java/org/xbib/event/timer/TimerEventService.java
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package org.xbib.event.timer;
import com.google.common.eventbus.EventBus;
import org.xbib.event.persistence.PersistenceStore;
import java.io.Closeable;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;
class TimerEventService implements Closeable {
private static final Logger logger = Logger.getLogger(TimerEventService.class.getName());
private final EventBus eventBus;
private final Class<? extends TimerEvent> eventClass;
private final ZoneId zoneId;
private final PersistenceStore<String, Object> persistenceStore;
private final Timer timer;
public TimerEventService(EventBus eventBus,
String name,
Class<? extends TimerEvent> eventClass,
ZoneId zoneId,
PersistenceStore<String, Object> persistenceStore) throws IOException {
this.eventBus = eventBus;
this.eventClass = eventClass;
this.zoneId = zoneId;
this.persistenceStore = persistenceStore;
this.timer = new Timer();
int tasknum = reschedule();
logger.log(Level.INFO, "timer event service " + name + " loaded and rescheduled, " + tasknum + " timer tasks");
}
void schedule(Instant instant, Map<String, Object> task) throws IOException {
ZonedDateTime zonedDateTime = instant.atZone(zoneId);
task.put("scheduled", zonedDateTime.format(DateTimeFormatter.ISO_DATE_TIME));
TimerEventTask timerEventTask = new TimerEventTask(task);
Date date = Date.from(instant);
timer.schedule(timerEventTask, date);
persistenceStore.insert("tasks", task);
logger.log(Level.INFO, "new task " + task + " added, scheduled at " + date);
}
@SuppressWarnings("unchecked")
int reschedule() throws IOException {
logger.log(Level.INFO, "rescheduling timer events");
persistenceStore.load();
List<Map<String, Object>> tasks = (List<Map<String, Object>>) persistenceStore.getOrDefault("tasks", new ArrayList<>());
persistenceStore.clear();
persistenceStore.commit();
for (Map<String, Object> task : tasks) {
ZonedDateTime scheduledDate = ZonedDateTime.parse((String) task.get("scheduled"), DateTimeFormatter.ISO_DATE_TIME);
if (scheduledDate.isBefore(ZonedDateTime.now())) {
logger.log(Level.WARNING, "scheduled timer task " + task + " date already passed");
} else {
schedule(scheduledDate.toInstant(), task);
}
}
tasks = (List<Map<String, Object>>) persistenceStore.getOrDefault("tasks", new ArrayList<>());
logger.log(Level.INFO, "rescheduling timer events complete: " + tasks.size() + " events");
return tasks.size();
}
@Override
public void close() throws IOException {
timer.cancel();
persistenceStore.commit();
}
void purge() {
timer.purge();
}
public class TimerEventTask extends TimerTask {
private final Map<String,Object> map;
public TimerEventTask(Map<String, Object> map) {
this.map = map;
}
@Override
public void run() {
TimerEvent timerEvent;
try {
timerEvent = eventClass.getDeclaredConstructor().newInstance();
} catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
logger.log(Level.SEVERE, e.getMessage(), e);
return;
}
timerEvent.setInstant(Instant.now());
timerEvent.setMap(map);
logger.log(Level.FINE, "posting timer event " + timerEvent.getClass().getName() + " map = " + map);
eventBus.post(timerEvent);
persistenceStore.remove("tasks", this);
logger.log(Level.FINE, "persistence after remove: " + persistenceStore.get("tasks"));
}
@Override
public String toString() {
return map.toString();
}
@Override
public int hashCode() {
return map.hashCode();
}
@Override
public boolean equals(Object object) {
return object instanceof TimerEventTask && Objects.equals(map, object);
}
}
}

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src/main/java/org/xbib/event/yield/Advancer.java
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package org.xbib.event.yield;
/**
* Sequential traverser with internal and individually step approach.
*/
public interface Advancer<T> {
/**
* An Advancer object without elements.
*/
static <R> Advancer<R> empty() {
return action -> false;
}
/**
* If a remaining element exists, yields that element through
* the given action.
*/
boolean tryAdvance(Yield<? super T> yield);
}

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src/main/java/org/xbib/event/yield/AsyncQuery.java
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package org.xbib.event.yield;
import org.xbib.event.yield.async.AsyncQueryDistinct;
import org.xbib.event.yield.async.AsyncQueryFilter;
import org.xbib.event.yield.async.AsyncQueryFlatMapConcat;
import org.xbib.event.yield.async.AsyncQueryFlatMapMerge;
import org.xbib.event.yield.async.AsyncQueryFork;
import org.xbib.event.yield.async.AsyncQueryMap;
import org.xbib.event.yield.async.AsyncQueryOf;
import org.xbib.event.yield.async.AsyncQueryOfIterator;
import org.xbib.event.yield.async.AsyncQueryOnNext;
import org.xbib.event.yield.async.AsyncQuerySkip;
import org.xbib.event.yield.async.AsyncQueryTakeWhile;
import java.util.Iterator;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.function.Predicate;
/**
* An asynchronous sequence of elements supporting sequential operations.
* Query operations are composed into a pipeline to perform computation.
*/
public abstract class AsyncQuery<T> implements AsyncTraverser<T> {
/**
* Returns an asynchronous sequential ordered query whose elements
* are the specified values in data parameter.
*/
@SuppressWarnings("unchecked")
public static <U> AsyncQuery<U> of(U... data) {
return new AsyncQueryOf<>(data);
}
/**
* Returns an asynchronous sequential ordered query whose elements
* are the specified values in the Iterator parameter.
*/
public static <U> AsyncQuery<U> of(Iterator<U> iter) {
return new AsyncQueryOfIterator<>(iter);
}
/**
* Returns an asynchronous sequential ordered query whose elements
* are the specified values in data parameter running on thread pool.
*/
@SuppressWarnings("unchecked")
public static <U> AsyncQuery<U> fork(U... data) {
return new AsyncQueryFork<>(data);
}
/**
* Returns a new asynchronous query emitting the same items of this query,
* additionally performing the provided action on each element as elements are consumed
* from the resulting query.
*/
public final AsyncQuery<T> onNext(BiConsumer<? super T, ? super Throwable> action) {
return new AsyncQueryOnNext<>(this, action);
}
/**
* Returns a new asynchronous query consisting of the remaining elements of
* this query after discarding the first {@code n} elements of the query.
*/
public final AsyncQuery<T> skip(int n) {
return new AsyncQuerySkip<>(this, n);
}
/**
* Returns an asynchronous query consisting of the elements of this query that match
* the given predicate.
*/
public final AsyncQuery<T> filter(Predicate<? super T> p) {
return new AsyncQueryFilter<>(this, p);
}
/**
* Returns an asynchronous query consisting of the results of applying the given
* function to the elements of this query.
*/
public final <R> AsyncQuery<R> map(Function<? super T, ? extends R> mapper) {
return new AsyncQueryMap<>(this, mapper);
}
/**
* Returns a query consisting of the distinct elements (according to
* {@link Object#equals(Object)}) of this query.
*/
public final AsyncQuery<T> distinct() {
return new AsyncQueryDistinct<>(this);
}
/**
* Returns a query consisting of the longest prefix of elements taken from
* this query that match the given predicate.
*/
public final AsyncQuery<T> takeWhile(Predicate<? super T> predicate) {
return new AsyncQueryTakeWhile<>(this, predicate);
}
/**
* Returns an asynchronous query consisting of the results of replacing each element of
* this query with the contents of a mapped query produced by applying
* the provided mapping function to each element.
* It waits for the inner flow to complete before starting to collect the next one.
*/
public final <R> AsyncQuery<R> flatMapConcat(Function<? super T, ? extends AsyncQuery<? extends R>> mapper) {
return new AsyncQueryFlatMapConcat<>(this, mapper);
}
public final <R> AsyncQuery<R> flatMapMerge(Function<? super T, ? extends AsyncQuery<? extends R>> mapper) {
return new AsyncQueryFlatMapMerge<>(this, mapper);
}
public final void blockingSubscribe() {
this
.subscribe((item, err) -> {
})
.join(); // In both previous cases cf will raise an exception.
}
}

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src/main/java/org/xbib/event/yield/AsyncTraverser.java
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package org.xbib.event.yield;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
/**
* Asynchronous traversal.
* We use a traverse method as its first choice to
* implement AsyncQuery operations.
* This is a special kind of traversal that disallows individually access.
*/
public interface AsyncTraverser<T> {
/**
* Yields elements sequentially until all elements have been
* processed or an exception is thrown.
* The given consumer is invoked with the result (or null if none)
* and the exception (or null if none).
*
* @return A CompletableFuture to signal finish to enable cancellation
* through its cancel() method.
*/
CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons);
}

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src/main/java/org/xbib/event/yield/Query.java
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package org.xbib.event.yield;
import org.xbib.event.yield.boxes.BoolBox;
import org.xbib.event.yield.boxes.Box;
import org.xbib.event.yield.ops.Concat;
import org.xbib.event.yield.ops.Distinct;
import org.xbib.event.yield.ops.DropWhile;
import org.xbib.event.yield.ops.Filter;
import org.xbib.event.yield.ops.FlatMap;
import org.xbib.event.yield.ops.FromArray;
import org.xbib.event.yield.ops.FromList;
import org.xbib.event.yield.ops.FromStream;
import org.xbib.event.yield.ops.Generate;
import org.xbib.event.yield.ops.Iterate;
import org.xbib.event.yield.ops.Limit;
import org.xbib.event.yield.ops.Mapping;
import org.xbib.event.yield.ops.Peek;
import org.xbib.event.yield.ops.Skip;
import org.xbib.event.yield.ops.TakeWhile;
import org.xbib.event.yield.ops.Zip;
import org.xbib.event.yield.primitives.dbl.DoubleAdvancer;
import org.xbib.event.yield.primitives.dbl.DoubleQuery;
import org.xbib.event.yield.primitives.dbl.DoubleTraverser;
import org.xbib.event.yield.primitives.intgr.IntAdvancer;
import org.xbib.event.yield.primitives.intgr.IntQuery;
import org.xbib.event.yield.primitives.intgr.IntTraverser;
import org.xbib.event.yield.primitives.lng.LongAdvancer;
import org.xbib.event.yield.primitives.lng.LongQuery;
import org.xbib.event.yield.primitives.lng.LongTraverser;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.Spliterator;
import java.util.Spliterators.AbstractSpliterator;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.BinaryOperator;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.function.ToDoubleFunction;
import java.util.function.ToIntFunction;
import java.util.function.ToLongFunction;
import java.util.function.UnaryOperator;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
/**
* A sequence of elements supporting sequential operations.
* Query operations are composed into a pipeline to perform
* computation.
*/
public class Query<T> {
private final Advancer<T> adv;
private final Traverser<T> trav;
public Query(Advancer<T> adv, Traverser<T> trav) {
this.adv = adv;
this.trav = trav;
}
/**
* Returns a sequential ordered query whose elements
* are the specified values in data parameter.
*/
@SuppressWarnings("unchecked")
public static <U> Query<U> of(U... data) {
FromArray<U> adv = new FromArray<>(data);
return new Query<>(adv, adv);
}
/**
* Returns a sequential ordered query with elements
* from the provided List data.
*/
public static <U> Query<U> fromList(List<U> data) {
FromList<U> adv = new FromList<>(data);
return new Query<>(adv, adv);
}
/**
* Returns a sequential ordered query with elements
* from the provided stream data.
*/
public static <U> Query<U> fromStream(Stream<U> data) {
FromStream<U> adv = new FromStream<>(data);
return new Query<>(adv, adv);
}
/**
* Returns an infinite sequential ordered {@code Query} produced by iterative
* application of a function {@code f} to an initial element {@code seed},
* producing a {@code Query} consisting of {@code seed}, {@code f(seed)},
* {@code f(f(seed))}, etc.
*/
public static <U> Query<U> iterate(U seed, UnaryOperator<U> f) {
Iterate<U> iter = new Iterate<>(seed, f);
return new Query<>(iter, iter);
}
/**
* Returns an infinite sequential unordered {@code Query}
* where each element is generated by the provided Supplier.
*/
public static <U> Query<U> generate(Supplier<U> s) {
Generate<U> gen = new Generate<>(s);
return new Query<>(gen, gen);
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or an
* exception is thrown.
*/
public final void traverse(Yield<? super T> yield) {
this.trav.traverse(yield);
}
/**
* If a remaining element exists, yields that element through
* the given action.
*/
public boolean tryAdvance(Yield<? super T> action) {
return this.adv.tryAdvance(action);
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or the traversal
* exited normally through the invocation of yield.bye().
*/
public final void shortCircuit(Yield<T> yield) {
try {
this.trav.traverse(yield);
} catch (TraversableFinishError e) {
/* Proceed */
}
}
/**
* Returns a query consisting of the results of applying the given
* function to the elements of this query.
*/
public final <R> Query<R> map(Function<? super T, ? extends R> mapper) {
Mapping<T, R> map = new Mapping<>(this, mapper);
return new Query<>(map, map);
}
/**
* Applies a specified function to the corresponding elements of two
* sequences, producing a sequence of the results.
*/
public final <U, R> Query<R> zip(Query<U> other, BiFunction<? super T, ? super U, ? extends R> zipper) {
Zip<T, U, R> zip = new Zip<>(this, other, zipper);
return new Query<>(zip, zip);
}
/**
* Returns a {@link IntQuery} with the elements of this {@code Query} mapped by
* a {@link ToIntFunction}
*
* @param mapper ToIntFunction used to map elements of this {@code Query} to int
*/
public final IntQuery mapToInt(ToIntFunction<? super T> mapper) {
return new IntQuery(IntAdvancer.from(adv, mapper), IntTraverser.from(trav, mapper));
}
/**
* Returns a {@link LongQuery} with the elements of this {@code Query} mapped by
* a {@link ToLongFunction}
*
* @param mapper ToLongFunction used to map elements of this {@code Query} to long
*/
public final LongQuery mapToLong(ToLongFunction<? super T> mapper) {
return new LongQuery(LongAdvancer.from(adv, mapper), LongTraverser.from(trav, mapper));
}
/**
* Returns a {@link DoubleQuery} with the elements of this {@code Query} mapped by
* a {@link ToDoubleFunction}
*
* @param mapper ToLongFunction used to map elements of this {@code Query} to double
*/
public final DoubleQuery mapToDouble(ToDoubleFunction<? super T> mapper) {
return new DoubleQuery(DoubleAdvancer.from(adv, mapper), DoubleTraverser.from(trav, mapper));
}
/**
* Returns a query consisting of the elements of this query that match
* the given predicate.
*/
public final Query<T> filter(Predicate<? super T> p) {
Filter<T> filter = new Filter<>(this, p);
return new Query<>(filter, filter);
}
/**
* Returns a query consisting of the remaining elements of this query
* after discarding the first {@code n} elements of the query.
*/
public final Query<T> skip(int n) {
Skip<T> skip = new Skip<>(this, n);
return new Query<>(skip, skip);
}
/**
* Returns a query consisting of the elements of this query, truncated
* to be no longer than {@code n} in length.
*/
public final Query<T> limit(int n) {
Limit<T> limit = new Limit<>(this, n);
return new Query<>(limit, limit);
}
/**
* Returns a query consisting of the distinct elements (according to
* {@link Object#equals(Object)}) of this query.
*/
public final Query<T> distinct() {
Distinct<T> dis = new Distinct<>(this);
return new Query<>(dis, dis);
}
/**
* Returns a query consisting of the results of replacing each element of
* this query with the contents of a mapped query produced by applying
* the provided mapping function to each element.
*/
public final <R> Query<R> flatMap(Function<? super T, ? extends Query<? extends R>> mapper) {
FlatMap<T, R> map = new FlatMap<>(this, mapper);
return new Query<>(map, map);
}
/**
* Returns a query consisting of the elements of this query, additionally
* performing the provided action on each element as elements are consumed
* from the resulting query.
*/
public final Query<T> peek(Consumer<? super T> action) {
Peek<T> peek = new Peek<>(this, action);
return new Query<>(peek, peek);
}
/**
* Returns a query consisting of the longest prefix of elements taken from
* this query that match the given predicate.
*/
public final Query<T> takeWhile(Predicate<? super T> predicate) {
TakeWhile<T> take = new TakeWhile<>(this, predicate);
return new Query<>(take, take);
}
/**
* The {@code then} operator lets you encapsulate a piece of an operator
* chain into a function.
* That function {@code next} is applied to this query to produce a new
* {@code Traverser} object that is encapsulated in the resulting query.
* On the other hand, the {@code nextAdv} is applied to this query to produce a new
* {@code Advancer} object that is encapsulated in the resulting query.
*/
public final <R> Query<R> then(Function<Query<T>, Advancer<R>> nextAdv, Function<Query<T>, Traverser<R>> next) {
return new Query<>(nextAdv.apply(this), next.apply(this));
}
/**
* The {@code then} operator lets you encapsulate a piece of an operator
* chain into a function.
* That function {@code next} is applied to this query to produce a new
* {@code Traverser} object that is encapsulated in the resulting query.
*/
public final <R> Query<R> then(Function<Query<T>, Traverser<R>> next) {
Advancer<R> nextAdv = item -> {
throw new UnsupportedOperationException(
"Missing tryAdvance() implementation! Use the overloaded then() providing both Advancer and Traverser!");
};
return new Query<>(nextAdv, next.apply(this));
}
/**
* Returns a list containing the elements of this query.
*/
public final List<T> toList() {
List<T> data = new ArrayList<>();
this.traverse(data::add);
return data;
}
/**
* Returns an array containing the elements of this query.
*/
public final Object[] toArray() {
return this.toArray(Object[]::new);
}
public final Stream<T> toStream() {
Spliterator<T> iter = new AbstractSpliterator<T>(Long.MAX_VALUE, Spliterator.ORDERED) {
@Override
public boolean tryAdvance(Consumer<? super T> action) {
return adv.tryAdvance(action::accept);
}
@Override
public void forEachRemaining(Consumer<? super T> action) {
trav.traverse(action::accept);
}
};
return StreamSupport.stream(iter, false);
}
/**
* Returns an {@link Optional} describing the first element of this query,
* or an empty {@code Optional} if this query is empty.
*/
public final Optional<T> findFirst() {
Box<T> box = new Box<>();
this.tryAdvance(box::turnPresent);
return box.isPresent()
? Optional.of(box.getValue())
: Optional.empty();
}
/**
* Returns the maximum element of this query according to the provided
* {@code Comparator}. This is a special case of a reduction.
*/
public final Optional<T> max(Comparator<? super T> cmp) {
class BoxMax extends Box<T> implements Yield<T> {
@Override
public final void ret(T item) {
if (!isPresent()) turnPresent(item);
else if (cmp.compare(item, value) > 0) value = item;
}
}
BoxMax b = new BoxMax();
this.traverse(b);
return b.isPresent() ? Optional.of(b.getValue()) : Optional.empty();
}
/**
* Returns whether any elements of this query match the provided
* predicate. May not evaluate the predicate on all elements if not
* necessary for determining the result. If the query is empty then
* {@code false} is returned and the predicate is not evaluated.
*/
public final boolean anyMatch(Predicate<? super T> p) {
BoolBox found = new BoolBox();
shortCircuit(item -> {
if (p.test(item)) {
found.set();
Yield.bye();
}
});
return found.isTrue();
}
/**
* Returns whether all elements of this query match the provided
* predicate. May not evaluate the predicate on all elements if not
* necessary for determining the result. If the query is empty then
* {@code true} is returned and the predicate is not evaluated.
*/
public final boolean allMatch(Predicate<? super T> p) {
BoolBox succeed = new BoolBox(true);
shortCircuit(item -> {
if (!p.test(item)) {
succeed.set(false);
Yield.bye();
}
});
return succeed.isTrue();
}
/**
* Returns the count of elements in this query.
*/
public final long count() {
class Counter implements Yield<T> {
long n = 0;
@Override
public void ret(T item) {
++n;
}
}
Counter c = new Counter();
this.traverse(c);
return c.n;
}
/**
* Returns an {@link Optional} with the resulting reduction of the elements of this {@code Query},
* if a reduction can be made, using the provided accumulator.
*/
public Optional<T> reduce(BinaryOperator<T> accumulator) {
Box<T> box = new Box<>();
if (this.tryAdvance(box::setValue)) {
return Optional.of(this.reduce(box.getValue(), accumulator));
} else {
return Optional.empty();
}
}
/**
* Returns the result of the reduction of the elements of this query,
* using the provided identity value and accumulator.
*/
public T reduce(T identity, BinaryOperator<T> accumulator) {
class BoxAccumulator extends Box<T> implements Yield<T> {
public BoxAccumulator(T identity) {
super(identity);
}
@Override
public final void ret(T item) {
this.value = accumulator.apply(value, item);
}
}
BoxAccumulator box = new BoxAccumulator(identity);
this.traverse(box);
return box.getValue();
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or an
* exception is thrown.
*/
public final void forEach(Yield<? super T> yield) {
this.traverse(yield);
}
/**
* Returns a {@link Set} containing the elements of this query.
*/
public final Set<T> toSet() {
Set<T> data = new HashSet<>();
this.traverse(data::add);
return data;
}
/**
* Returns an array containing the elements of this query.
*/
public final <U> U[] toArray(IntFunction<U[]> generator) {
return this.toList().toArray(generator);
}
/**
* Returns the concatenation of the input elements into a String, in encounter order.
*/
public final String join() {
return this.map(String::valueOf)
.collect(StringBuilder::new, StringBuilder::append)
.toString();
}
/**
* Returns an {@link Optional} describing any element of this query,
* or an empty {@code Optional} if this query is empty.
*/
public final Optional<T> findAny() {
return this.findFirst();
}
/**
* Returns the minimum element of this query according to the provided
* {@code Comparator}. This is a special case of a reduction.
*/
public final Optional<T> min(Comparator<? super T> cmp) {
return this.max((a, b) -> cmp.compare(a, b) * -1);
}
/**
* Returns whether no elements of this query match the provided
* predicate. May not evaluate the predicate on all elements if not
* necessary for determining the result. If the query is empty then
* {@code true} is returned and the predicate is not evaluated.
*/
public final boolean noneMatch(Predicate<? super T> p) {
return !this.anyMatch(p);
}
/**
* Performs a mutable reduction operation on the elements of this {@code Query}.
* A mutable reduction is one in which the reduced value is a mutable result container, such as an ArrayList,
* and elements are incorporated by updating the state of the result rather than by replacing the result.
*/
public <R> R collect(Supplier<R> supplier, BiConsumer<R, ? super T> accumulator) {
R result = supplier.get();
this.traverse(elem -> accumulator.accept(result, elem));
return result;
}
/**
* Creates a concatenated {@code Query} in which the elements are
* all the elements of this {@code Query} followed by all the
* elements of the other {@code Query}.
*/
public final Query<T> concat(Query<T> other) {
Concat<T> con = new Concat<>(this, other);
return new Query<>(con, con);
}
/**
* Returns a {@code Query} consisting of the elements of this {@code Query},
* sorted according to the provided Comparator.
* <p>
* This is a stateful intermediate operation.
*/
@SuppressWarnings("unchecked")
public final Query<T> sorted(Comparator<T> comparator) {
T[] state = (T[]) this.toArray();
Arrays.sort(state, comparator);
FromArray<T> sorted = new FromArray<>(state);
return new Query<>(sorted, sorted);
}
/**
* Returns a {@code Query} consisting of the remaining elements of this query
* after discarding the first sequence of elements that match the given Predicate.
*/
public final Query<T> dropWhile(Predicate<T> predicate) {
DropWhile<T> drop = new DropWhile<>(this, predicate);
return new Query<>(drop, drop);
}
}

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package org.xbib.event.yield;
@SuppressWarnings("serial")
public class TraversableFinishError extends Error {
public static final TraversableFinishError finishTraversal = new TraversableFinishError();
private TraversableFinishError() {
super("Auxiliary exception finishes traversal!", null, false, false);
}
}

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src/main/java/org/xbib/event/yield/Traverser.java
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package org.xbib.event.yield;
/**
* Bulk traversal.
* We uses traverse method as its first choice to
* implement Query operations.
* This is a special kind of traversal that disallows individually access.
*/
public interface Traverser<T> {
/**
* A Traverser object without elements.
*/
static <R> Traverser<R> empty() {
return action -> {
};
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or an
* exception is thrown.
*/
void traverse(Yield<? super T> yield);
}

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src/main/java/org/xbib/event/yield/Yield.java
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package org.xbib.event.yield;
/**
* Equivalent to {@code Consumer<T>} with a yield semantics.
*/
@FunctionalInterface
public interface Yield<T> {
/**
* Auxiliary function for traversal short circuit.
*/
static void bye() {
throw TraversableFinishError.finishTraversal;
}
void ret(T item);
}

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src/main/java/org/xbib/event/yield/async/AsyncQueryDistinct.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.HashSet;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
public class AsyncQueryDistinct<T> extends AsyncQuery<T> {
private final AsyncQuery<T> upstream;
public AsyncQueryDistinct(AsyncQuery<T> upstream) {
this.upstream = upstream;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
final HashSet<T> mem = new HashSet<>();
return upstream.subscribe((item, err) -> {
if (err != null) {
cons.accept(null, err);
return;
}
if (mem.add(item)) cons.accept(item, null);
});
}
}

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src/main/java/org/xbib/event/yield/async/AsyncQueryFilter.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Predicate;
public class AsyncQueryFilter<T> extends AsyncQuery<T> {
private final AsyncQuery<T> upstream;
private final Predicate<? super T> p;
public AsyncQueryFilter(AsyncQuery<T> upstream, Predicate<? super T> p) {
this.upstream = upstream;
this.p = p;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
return upstream.subscribe((item, err) -> {
if (err != null) {
cons.accept(null, err);
return;
}
if (p.test(item)) cons.accept(item, null);
});
}
}

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src/main/java/org/xbib/event/yield/async/AsyncQueryFlatMapConcat.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Function;
public class AsyncQueryFlatMapConcat<T, R> extends AsyncQuery<R> {
private final AsyncQuery<T> upstream;
private final Function<? super T, ? extends AsyncQuery<? extends R>> mapper;
public AsyncQueryFlatMapConcat(AsyncQuery<T> upstream, Function<? super T, ? extends AsyncQuery<? extends R>> mapper) {
this.upstream = upstream;
this.mapper = mapper;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super R, ? super Throwable> cons) {
return upstream.subscribe((item, err) -> {
if (err != null) {
cons.accept(null, err);
return;
}
mapper.apply(item)
.subscribe(cons)
.join();
});
}
}

38
src/main/java/org/xbib/event/yield/async/AsyncQueryFlatMapMerge.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Function;
public class AsyncQueryFlatMapMerge<T, R> extends AsyncQuery<R> {
private final AsyncQuery<T> upstream;
private final Function<? super T, ? extends AsyncQuery<? extends R>> mapper;
public AsyncQueryFlatMapMerge(AsyncQuery<T> upstream, Function<? super T, ? extends AsyncQuery<? extends R>> mapper) {
this.upstream = upstream;
this.mapper = mapper;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super R, ? super Throwable> cons) {
List<CompletableFuture<Void>> cfs = new ArrayList<>();
return upstream
.subscribe((item, err) -> {
if (err != null) {
cons.accept(null, err);
return;
}
cfs.add(mapper
.apply(item)
.subscribe(cons));
})
.thenCompose(ignore -> CompletableFuture.allOf(cfs.toArray(new CompletableFuture<?>[0])));
}
}

25
src/main/java/org/xbib/event/yield/async/AsyncQueryFork.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import org.xbib.event.yield.Query;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import static java.util.concurrent.CompletableFuture.runAsync;
public class AsyncQueryFork<U> extends AsyncQuery<U> {
private final U[] data;
public AsyncQueryFork(U[] data) {
this.data = data;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super U, ? super Throwable> cons) {
return runAsync(() -> Query
.of(data)
.traverse(item -> cons.accept(item, null)));
}
}

30
src/main/java/org/xbib/event/yield/async/AsyncQueryMap.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Function;
public class AsyncQueryMap<T, R> extends AsyncQuery<R> {
private final AsyncQuery<T> upstream;
private final Function<? super T, ? extends R> mapper;
public AsyncQueryMap(AsyncQuery<T> upstream, Function<? super T, ? extends R> mapper) {
this.upstream = upstream;
this.mapper = mapper;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super R, ? super Throwable> cons) {
return upstream.subscribe((item, err) -> {
if (err != null) {
cons.accept(null, err);
return;
}
cons.accept(mapper.apply(item), null);
});
}
}

22
src/main/java/org/xbib/event/yield/async/AsyncQueryOf.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import org.xbib.event.yield.Query;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
public class AsyncQueryOf<U> extends AsyncQuery<U> {
private final U[] data;
public AsyncQueryOf(U[] data) {
this.data = data;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super U, ? super Throwable> cons) {
Query.of(data).traverse(item -> cons.accept(item, null));
return CompletableFuture.completedFuture(null);
}
}

24
src/main/java/org/xbib/event/yield/async/AsyncQueryOfIterator.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.Iterator;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
public class AsyncQueryOfIterator<T> extends AsyncQuery<T> {
private final Iterator<T> iter;
public AsyncQueryOfIterator(Iterator<T> iter) {
this.iter = iter;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
while (iter.hasNext()) {
cons.accept(iter.next(), null);
}
return CompletableFuture.completedFuture(null);
}
}

26
src/main/java/org/xbib/event/yield/async/AsyncQueryOnNext.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
public class AsyncQueryOnNext<T> extends AsyncQuery<T> {
private final AsyncQuery<T> upstream;
private final BiConsumer<? super T, ? super Throwable> action;
public AsyncQueryOnNext(AsyncQuery<T> upstream, BiConsumer<? super T, ? super Throwable> action) {
this.upstream = upstream;
this.action = action;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
return upstream.subscribe((item, err) -> {
action.accept(item, err);
cons.accept(item, err);
});
}
}

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src/main/java/org/xbib/event/yield/async/AsyncQuerySkip.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import org.xbib.event.yield.AsyncTraverser;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
public class AsyncQuerySkip<T> extends AsyncQuery<T> {
private final AsyncTraverser<T> upstream;
private final int skip;
private int count = 0;
public AsyncQuerySkip(AsyncTraverser<T> upstream, int skip) {
this.upstream = upstream;
this.skip = skip;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
return upstream.subscribe((item, err) -> {
if (err != null) {
cons.accept(null, err);
return;
}
if (count >= skip) cons.accept(item, err);
else count++;
});
}
}

60
src/main/java/org/xbib/event/yield/async/AsyncQueryTakeWhile.java
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package org.xbib.event.yield.async;
import org.xbib.event.yield.AsyncQuery;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import java.util.function.Predicate;
public class AsyncQueryTakeWhile<T> extends AsyncQuery<T> {
private final AsyncQuery<T> upstream;
private final Predicate<? super T> p;
private CompletableFuture<Void> subscription;
/**
* After cancellation of upstream subscription we may still receive updates on consumer.
* To avoid propagation we must check if we have already cancelled the subscription.
* But we need a different flag from the CF subscription because this field may not be
* initialized yet on first check of the subscribe callback.
*/
private boolean finished = false;
public AsyncQueryTakeWhile(AsyncQuery<T> upstream, Predicate<? super T> p) {
this.upstream = upstream;
this.p = p;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
subscription = upstream.subscribe((item, err) -> {
/*
* After cancellation of upstream subscription we may still receive updates on consumer.
* To avoid propagation we must check if we have already cancelled the subscription.
*/
if (finished) {
if (subscription != null && !subscription.isDone())
subscription.complete(null);
return;
}
if (err != null) {
cons.accept(null, err);
return;
}
if (p.test(item)) cons.accept(item, null);
else {
if (!finished) {
finished = true;
// We need this guard because we could meet conditions
// to finish processing, yet the outer subscribe() invocation
// has not returned and the subscription is still null.
if (subscription != null)
subscription.complete(null);
}
}
});
return subscription;
}
}

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src/main/java/org/xbib/event/yield/boxes/BoolBox.java
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package org.xbib.event.yield.boxes;
public class BoolBox {
private boolean value;
public BoolBox(boolean value) {
this.value = value;
}
public BoolBox() {
this(false);
}
public boolean isTrue() {
return value;
}
public boolean isFalse() {
return !value;
}
public void set() {
value = true;
}
public void set(boolean val) {
value = val;
}
}

34
src/main/java/org/xbib/event/yield/boxes/Box.java
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package org.xbib.event.yield.boxes;
public class Box<T> {
protected T value;
private boolean isPresent;
public Box() {
}
public Box(T identity) {
this.value = identity;
this.isPresent = true;
}
public final boolean isPresent() {
return isPresent;
}
public final T getValue() {
return value;
}
public final T setValue(T value) {
this.value = value;
return value;
}
public final void turnPresent(T e) {
this.setValue(e);
this.isPresent = true;
}
}

39
src/main/java/org/xbib/event/yield/boxes/DoubleBox.java
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package org.xbib.event.yield.boxes;
public class DoubleBox {
protected double value;
private boolean isPresent;
public DoubleBox() {
this(Double.MIN_VALUE, false);
}
public DoubleBox(double value, boolean isPresent) {
this.value = value;
this.isPresent = isPresent;
}
public DoubleBox(double identity) {
this.value = identity;
this.isPresent = true;
}
public double getValue() {
return value;
}
public void setValue(double value) {
this.value = value;
}
public boolean isPresent() {
return isPresent;
}
public void turnPresent(double value) {
this.value = value;
isPresent = true;
}
}

38
src/main/java/org/xbib/event/yield/boxes/IntBox.java
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package org.xbib.event.yield.boxes;
public class IntBox {
protected int value;
private boolean isPresent;
public IntBox() {
this(Integer.MIN_VALUE, false);
}
public IntBox(int value, boolean isPresent) {
this.value = value;
this.isPresent = isPresent;
}
public IntBox(int identity) {
this.value = identity;
}
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
public boolean isPresent() {
return isPresent;
}
public void turnPresent(int value) {
this.value = value;
isPresent = true;
}
}

38
src/main/java/org/xbib/event/yield/boxes/LongBox.java
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package org.xbib.event.yield.boxes;
public class LongBox {
protected long value;
private boolean isPresent;
public LongBox() {
this(Long.MIN_VALUE, false);
}
public LongBox(long value, boolean isPresent) {
this.value = value;
this.isPresent = isPresent;
}
public LongBox(long identity) {
this.value = identity;
}
public long getValue() {
return value;
}
public void setValue(long value) {
this.value = value;
}
public boolean isPresent() {
return isPresent;
}
public void turnPresent(long value) {
this.value = value;
isPresent = true;
}
}

29
src/main/java/org/xbib/event/yield/ops/Concat.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
public class Concat<T> implements Advancer<T>, Traverser<T> {
private final Query<T> first;
private final Query<T> second;
public Concat(Query<T> first, Query<T> second) {
this.first = first;
this.second = second;
}
@Override
public void traverse(Yield<? super T> yield) {
this.first.traverse(yield);
this.second.traverse(yield);
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
return first.tryAdvance(yield) || second.tryAdvance(yield);
}
}

38
src/main/java/org/xbib/event/yield/ops/Distinct.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import org.xbib.event.yield.boxes.BoolBox;
import java.util.HashSet;
public class Distinct<T> implements Advancer<T>, Traverser<T> {
final HashSet<T> mem = new HashSet<>();
private final Query<T> upstream;
public Distinct(Query<T> adv) {
this.upstream = adv;
}
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(item -> {
if (mem.add(item)) yield.ret(item);
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
final BoolBox found = new BoolBox();
while (found.isFalse() && upstream.tryAdvance(item -> {
if (mem.add(item)) {
yield.ret(item);
found.set();
}
})) ;
return found.isTrue();
}
}

55
src/main/java/org/xbib/event/yield/ops/DropWhile.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.Predicate;
public class DropWhile<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final Predicate<T> predicate;
private boolean dropped;
public DropWhile(Query<T> upstream, Predicate<T> predicate) {
this.upstream = upstream;
this.predicate = predicate;
}
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(item -> {
if (!dropped && !predicate.test(item)) {
dropped = true;
}
if (dropped) {
yield.ret(item);
}
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
if (dropped) {
return upstream.tryAdvance(yield);
} else {
while (!dropped && dropNext(yield)) {
// Intentionally empty. Action specified on yield statement of tryAdvance().
}
return dropped;
}
}
private boolean dropNext(Yield<? super T> yield) {
return upstream.tryAdvance(item -> {
if (!predicate.test(item)) {
dropped = true;
yield.ret(item);
}
});
}
}

44
src/main/java/org/xbib/event/yield/ops/Filter.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import org.xbib.event.yield.boxes.BoolBox;
import java.util.function.Predicate;
public class Filter<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final Predicate<? super T> p;
public Filter(Query<T> adv, Predicate<? super T> p) {
this.upstream = adv;
this.p = p;
}
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(e -> {
if (p.test(e))
yield.ret(e);
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
BoolBox found = new BoolBox();
while (found.isFalse()) {
boolean hasNext = upstream.tryAdvance(item -> {
if (p.test(item)) {
yield.ret(item);
found.set();
}
});
if (!hasNext) break;
}
return found.isTrue();
}
}

39
src/main/java/org/xbib/event/yield/ops/FlatMap.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.Function;
public class FlatMap<T, R> implements Advancer<R>, Traverser<R> {
private final Query<T> upstream;
private final Function<? super T, ? extends Query<? extends R>> mapper;
private Query<? extends R> src;
public FlatMap(Query<T> query, Function<? super T, ? extends Query<? extends R>> mapper) {
this.upstream = query;
this.mapper = mapper;
src = new Query<>(Advancer.empty(), Traverser.empty());
}
@Override
public void traverse(Yield<? super R> yield) {
upstream.traverse(elem ->
mapper.apply(elem).traverse(yield));
}
@Override
public boolean tryAdvance(Yield<? super R> yield) {
while (!src.tryAdvance(yield)) {
if (!upstream.tryAdvance(t -> src = mapper.apply(t)))
return false;
}
return true;
}
}

42
src/main/java/org/xbib/event/yield/ops/FromArray.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
public class FromArray<U> implements Advancer<U>, Traverser<U> {
private final U[] data;
private int current;
@SuppressWarnings("unchecked")
public FromArray(U... data) {
this.data = data;
this.current = 0;
}
public boolean hasNext() {
return current < data.length;
}
/**
* Continues from the point where tryAdvance or next left the
* internal iteration.
*
* @param yield yield
*/
@Override
public void traverse(Yield<? super U> yield) {
for (int i = current; i < data.length; i++) {
yield.ret(data[i]);
}
}
@Override
public boolean tryAdvance(Yield<? super U> yield) {
if (!hasNext()) return false;
yield.ret(data[current++]);
return true;
}
}

26
src/main/java/org/xbib/event/yield/ops/FromList.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.List;
import java.util.Spliterator;
public class FromList<U> implements Advancer<U>, Traverser<U> {
private final Spliterator<U> current;
public FromList(List<U> data) {
this.current = data.spliterator();
}
@Override
public void traverse(Yield<? super U> yield) {
current.forEachRemaining(yield::ret);
}
@Override
public boolean tryAdvance(Yield<? super U> yield) {
return current.tryAdvance(yield::ret);
}
}

28
src/main/java/org/xbib/event/yield/ops/FromStream.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.Spliterator;
import java.util.stream.Stream;
public class FromStream<U> implements Advancer<U>, Traverser<U> {
private final Spliterator<U> upstream;
public FromStream(Stream<U> data) {
this.upstream = data.spliterator();
}
@Override
public void traverse(Yield<? super U> yield) {
upstream.forEachRemaining(yield::ret);
}
@Override
public boolean tryAdvance(Yield<? super U> yield) {
return upstream.tryAdvance(yield::ret);
}
}

29
src/main/java/org/xbib/event/yield/ops/Generate.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.Supplier;
public class Generate<U> implements Advancer<U>, Traverser<U> {
private final Supplier<U> s;
public Generate(Supplier<U> s) {
this.s = s;
}
@Override
public void traverse(Yield<? super U> yield) {
while (true) {
yield.ret(s.get());
}
}
@Override
public boolean tryAdvance(Yield<? super U> yield) {
yield.ret(s.get());
return true;
}
}

33
src/main/java/org/xbib/event/yield/ops/Iterate.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.UnaryOperator;
public class Iterate<U> implements Advancer<U>, Traverser<U> {
private final UnaryOperator<U> f;
private U prev;
public Iterate(U seed, UnaryOperator<U> f) {
this.f = f;
this.prev = seed;
}
@Override
public void traverse(Yield<? super U> yield) {
for (U curr = prev; true; curr = f.apply(curr))
yield.ret(curr);
}
@Override
public boolean tryAdvance(Yield<? super U> yield) {
U curr = prev;
prev = f.apply(prev);
yield.ret(curr);
return true;
}
}

38
src/main/java/org/xbib/event/yield/ops/Limit.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
public class Limit<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final int n;
int count;
public Limit(Query<T> upstream, int n) {
this.upstream = upstream;
this.n = n;
count = 0;
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
if (count >= n) return false;
count++;
return upstream.tryAdvance(yield);
}
@Override
public void traverse(Yield<? super T> yield) {
if (count >= n)
throw new IllegalStateException("Traverser has already been operated on or closed!");
while (this.tryAdvance(yield)) {
// Intentionally empty. Action specified on yield statement of tryAdvance().
}
}
}

30
src/main/java/org/xbib/event/yield/ops/Mapping.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.Function;
public class Mapping<T, R> implements Advancer<R>, Traverser<R> {
private final Query<T> upstream;
private final Function<? super T, ? extends R> mapper;
public Mapping(Query<T> adv, Function<? super T, ? extends R> mapper) {
this.upstream = adv;
this.mapper = mapper;
}
@Override
public void traverse(Yield<? super R> yield) {
upstream.traverse(e -> yield.ret(mapper.apply(e)));
}
@Override
public boolean tryAdvance(Yield<? super R> yield) {
return upstream.tryAdvance(item -> yield.ret(mapper.apply(item)));
}
}

36
src/main/java/org/xbib/event/yield/ops/Peek.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.Consumer;
public class Peek<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final Consumer<? super T> action;
public Peek(Query<T> adv, Consumer<? super T> action) {
this.upstream = adv;
this.action = action;
}
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(item -> {
action.accept(item);
yield.ret(item);
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
return upstream.tryAdvance(item -> {
action.accept(item);
yield.ret(item);
});
}
}

43
src/main/java/org/xbib/event/yield/ops/Skip.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
public class Skip<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final int n;
int index;
public Skip(Query<T> adv, int n) {
this.upstream = adv;
this.n = n;
index = 0;
}
/**
* Continues from the point where tryAdvance or next left the
* internal iteration.
*
* @param yield the yield
*/
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(item -> {
if (index++ >= n)
yield.ret(item);
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
for (; index < n; index++)
upstream.tryAdvance(item -> {
});
return upstream.tryAdvance(yield);
}
}

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src/main/java/org/xbib/event/yield/ops/TakeWhile.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import java.util.function.Predicate;
public class TakeWhile<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final Predicate<? super T> predicate;
private boolean hasNext;
public TakeWhile(Query<T> upstream, Predicate<? super T> predicate) {
this.upstream = upstream;
this.predicate = predicate;
this.hasNext = true;
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
if (!hasNext) return false; // Once predicate is false it finishes the iteration
Yield<T> takeWhile = item -> {
if (predicate.test(item)) {
yield.ret(item);
} else {
hasNext = false;
}
};
return upstream.tryAdvance(takeWhile) && hasNext;
}
@Override
public void traverse(Yield<? super T> yield) {
upstream.shortCircuit(item -> {
if (!predicate.test(item)) Yield.bye();
yield.ret(item);
});
}
}

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src/main/java/org/xbib/event/yield/ops/Zip.java
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package org.xbib.event.yield.ops;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import org.xbib.event.yield.boxes.BoolBox;
import java.util.function.BiFunction;
public class Zip<T, U, R> implements Advancer<R>, Traverser<R> {
private final Query<T> upstream;
private final Query<U> other;
private final BiFunction<? super T, ? super U, ? extends R> zipper;
public Zip(Query<T> upstream, Query<U> other, BiFunction<? super T, ? super U, ? extends R> zipper) {
this.upstream = upstream;
this.other = other;
this.zipper = zipper;
}
@Override
public boolean tryAdvance(Yield<? super R> yield) {
BoolBox consumed = new BoolBox();
upstream.tryAdvance(e1 -> other.tryAdvance(e2 -> {
yield.ret(zipper.apply(e1, e2));
consumed.set();
}));
return consumed.isTrue();
}
@Override
public void traverse(Yield<? super R> yield) {
upstream.shortCircuit(e1 -> {
if (!other.tryAdvance(e2 -> yield.ret(zipper.apply(e1, e2))))
Yield.bye();
});
}
}

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src/main/java/org/xbib/event/yield/primitives/dbl/DoubleAdvancer.java
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package org.xbib.event.yield.primitives.dbl;
import org.xbib.event.yield.Advancer;
import org.xbib.event.yield.Yield;
import org.xbib.event.yield.primitives.intgr.IntAdvancer;
import org.xbib.event.yield.primitives.lng.LongAdvancer;
import java.util.function.DoubleToLongFunction;
import java.util.function.IntToDoubleFunction;
import java.util.function.LongToDoubleFunction;
import java.util.function.ToDoubleFunction;
/**
* Sequential traverser with both internal and external iteration approach.
*/
public interface DoubleAdvancer extends Advancer<Double> {
/**
* An DoubleAdvancer object without elements.
*/
static DoubleAdvancer empty() {
return action -> false;
}
/**
* A DoubleAdvancer object from a generic {@link Advancer} mapped by a {@link ToDoubleFunction}.
*
* @param source {@link Advancer} with the source elements for this {@code DoubleAdvancer}.
* @param mapper {@link ToDoubleFunction} that specifies how to map the source elements double values.
*/
static <T> DoubleAdvancer from(Advancer<T> source, ToDoubleFunction<? super T> mapper) {
return yield -> source.tryAdvance(item -> yield.ret(mapper.applyAsDouble(item)));
}
/**
* A DoubleAdvancer object from a {@link LongAdvancer} mapped by a {@link LongToDoubleFunction}.
*
* @param source {@link LongAdvancer} with the source elements for this {@code LongAdvancer}.
* @param mapper {@link DoubleToLongFunction} that specifies how to map the source elements into double values.
*/
static DoubleAdvancer from(LongAdvancer source, LongToDoubleFunction mapper) {
return from((Advancer<Long>) source, mapper::applyAsDouble);
}
/**
* A DoubleAdvancer object from a {@link IntAdvancer} mapped by a {@link IntToDoubleFunction}.
*
* @param source {@link IntAdvancer} with the source elements for this {@code LongAdvancer}.
* @param mapper {@link IntToDoubleFunction} that specifies how to map the source elements into double values.
*/
static DoubleAdvancer from(IntAdvancer source, IntToDoubleFunction mapper) {
return from((Advancer<Integer>) source, mapper::applyAsDouble);
}
/**
* Default advance implementation that calls the
* primitive version of it
*/
@Override
default boolean tryAdvance(Yield<? super Double> yield) {
DoubleYield yld = yield::ret;
return this.tryAdvance(yld);
}
/**
* If a remaining element exists, yields that element through
* the given action.
*/
boolean tryAdvance(DoubleYield yield);
}

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src/main/java/org/xbib/event/yield/primitives/dbl/DoubleQuery.java
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package org.xbib.event.yield.primitives.dbl;
import org.xbib.event.yield.Query;
import org.xbib.event.yield.TraversableFinishError;
import org.xbib.event.yield.Yield;
import org.xbib.event.yield.boxes.BoolBox;
import org.xbib.event.yield.boxes.DoubleBox;
import org.xbib.event.yield.primitives.dbl.ops.DoubleConcat;
import org.xbib.event.yield.primitives.dbl.ops.DoubleDistinct;
import org.xbib.event.yield.primitives.dbl.ops.DoubleDropWhile;
import org.xbib.event.yield.primitives.dbl.ops.DoubleFilter;
import org.xbib.event.yield.primitives.dbl.ops.DoubleFlatMap;
import org.xbib.event.yield.primitives.dbl.ops.DoubleGenerate;
import org.xbib.event.yield.primitives.dbl.ops.DoubleIterate;
import org.xbib.event.yield.primitives.dbl.ops.DoubleLimit;
import org.xbib.event.yield.primitives.dbl.ops.DoubleMapToObj;
import org.xbib.event.yield.primitives.dbl.ops.DoubleMapping;
import org.xbib.event.yield.primitives.dbl.ops.DoublePeek;
import org.xbib.event.yield.primitives.dbl.ops.DoubleSkip;
import org.xbib.event.yield.primitives.dbl.ops.DoubleTakeWhile;
import org.xbib.event.yield.primitives.dbl.ops.DoubleZip;
import org.xbib.event.yield.primitives.dbl.ops.FromDoubleArray;
import org.xbib.event.yield.primitives.dbl.ops.FromDoubleStream;
import org.xbib.event.yield.primitives.intgr.IntAdvancer;
import org.xbib.event.yield.primitives.intgr.IntQuery;
import org.xbib.event.yield.primitives.intgr.IntTraverser;
import org.xbib.event.yield.primitives.lng.LongAdvancer;
import org.xbib.event.yield.primitives.lng.LongQuery;
import org.xbib.event.yield.primitives.lng.LongTraverser;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.DoubleSummaryStatistics;
import java.util.List;
import java.util.OptionalDouble;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.DoubleBinaryOperator;
import java.util.function.DoubleConsumer;
import java.util.function.DoubleFunction;
import java.util.function.DoublePredicate;
import java.util.function.DoubleSupplier;
import java.util.function.DoubleToIntFunction;
import java.util.function.DoubleToLongFunction;
import java.util.function.DoubleUnaryOperator;
import java.util.function.Function;
import java.util.function.ObjDoubleConsumer;
import java.util.function.Supplier;
import java.util.stream.DoubleStream;
import java.util.stream.StreamSupport;
/**
* A sequence of primitive double-valued elements supporting sequential
* operations. This is the double primitive specialization of Query.
*/
public class DoubleQuery {
private final DoubleAdvancer adv;
private final DoubleTraverser trav;
public DoubleQuery(DoubleAdvancer adv, DoubleTraverser trav) {
this.adv = adv;
this.trav = trav;
}
/**
* Returns a sequential ordered {@code DoubleQuery} with elements
* from the provided {@link DoubleStream} data.
*/
public static DoubleQuery fromStream(DoubleStream src) {
FromDoubleStream strm = new FromDoubleStream(src);
return new DoubleQuery(strm, strm);
}
/**
* Returns an infinite sequential ordered {@code DoubleQuery} produced by iterative
* application of a function {@code f} to an initial element {@code seed},
* producing a {@code DoubleQuery} consisting of {@code seed}, {@code f(seed)},
* {@code f(f(seed))}, etc.
*/
public static DoubleQuery iterate(double seed, DoubleUnaryOperator f) {
DoubleIterate iter = new DoubleIterate(seed, f);
return new DoubleQuery(iter, iter);
}
/**
* Returns an infinite sequential unordered {@code DoubleQuery}
* where each element is generated by the provided Supplier.
*/
public static DoubleQuery generate(DoubleSupplier s) {
DoubleGenerate gen = new DoubleGenerate(s);
return new DoubleQuery(gen, gen);
}
/**
* Returns a sequential ordered {@code DoubleQuery} whose elements
* are the specified values in data parameter.
*/
public static DoubleQuery of(double... data) {
FromDoubleArray arr = new FromDoubleArray(data);
return new DoubleQuery(arr, arr);
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or an
* exception is thrown.
*/
public final void forEach(DoubleYield yield) {
this.traverse(yield);
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or an
* exception is thrown.
*/
public final void traverse(DoubleYield yield) {
this.trav.traverse(yield);
}
/**
* If a remaining element exists, yields that element through
* the given action.
*/
public boolean tryAdvance(DoubleYield action) {
return this.adv.tryAdvance(action);
}
/**
* Returns a {@code DoubleQuery} consisting of the elements of this {@code DoubleQuery} that match
* the given predicate.
*/
public DoubleQuery filter(DoublePredicate p) {
DoubleFilter filter = new DoubleFilter(this, p);
return new DoubleQuery(filter, filter);
}
/**
* Returns a {@code DoubleQuery} consisting of the results of applying the given
* DoubleUnaryOperator to the elements of this {@code DoubleQuery}.
*
* @param op DoubleUnaryOperator used to map the elements of this DoubleQuery
*/
public DoubleQuery map(DoubleUnaryOperator op) {
DoubleMapping map = new DoubleMapping(this, op);
return new DoubleQuery(map, map);
}
/**
* Returns a {@code Query} consisting of the results of applying the given
* function to the elements of this {@code DoubleQuery}.
*
* @param function DoubleFunction used to map the elements of this DoubleQuery
*/
public <U> Query<U> mapToObj(DoubleFunction<? extends U> function) {
DoubleMapToObj<U> map = new DoubleMapToObj<>(this, function);
return new Query<>(map, map);
}
/**
* Returns a {@code DoubleQuery} consisting of the results of replacing each element of
* this {@code DoubleQuery} with the contents of a mapped {@code DoubleQuery} produced by applying
* the provided mapping function to each element.
*/
public DoubleQuery flatMap(DoubleFunction<? extends DoubleQuery> function) {
DoubleFlatMap map = new DoubleFlatMap(this, function);
return new DoubleQuery(map, map);
}
/**
* Returns a query consisting of the distinct elements (according to
* {@link Object#equals(Object)}) of this query.
*/
public DoubleQuery distinct() {
DoubleDistinct dist = new DoubleDistinct(this);
return new DoubleQuery(dist, dist);
}
/**
* Returns a {@code DoubleQuery} consisting of the elements of this {@code DoubleQuery},
* sorted according to the same logic as {@code Arrays.sort(double[] a)}.
* <p>
* This is a stateful intermediate operation.
*/
public DoubleQuery sorted() {
double[] state = this.toArray();
Arrays.sort(state);
FromDoubleArray arr = new FromDoubleArray(state);
return new DoubleQuery(arr, arr);
}
/**
* Returns an array containing the elements of this {@code DoubleQuery}.
*/
public double[] toArray() {
List<Double> list = toList();
double[] result = new double[list.size()];
for (int i = 0; i < list.size(); i++) {
result[i] = list.get(i);
}
return result;
}
/**
* Returns a List containing the elements of this {@code DoubleQuery}.
*/
public List<Double> toList() {
ArrayList<Double> result = new ArrayList<>();
this.traverse(result::add);
return result;
}
/**
* Returns a {@code DoubleQuery} consisting of the elements of this {@code DoubleQuery}, additionally
* performing the provided action on each element as elements are consumed
* from the resulting {@code DoubleQuery}.
*/
public DoubleQuery peek(DoubleConsumer action) {
DoublePeek peek = new DoublePeek(this, action);
return new DoubleQuery(peek, peek);
}
/**
* Returns a {@code DoubleQuery} consisting of the elements of this query, truncated
* to be no longer than {@code n} in length.
*
* @param n maximum amount of elements to retrieve from this {@code DoubleQuery}
*/
public DoubleQuery limit(int n) {
DoubleLimit lim = new DoubleLimit(this, n);
return new DoubleQuery(lim, lim);
}
/**
* Returns a {@code DoubleQuery} consisting of the remaining elements of this {@code DoubleQuery}
* after discarding the first {@code n} elements of the {@code DoubleQuery}.
*
* @param n number of elements to discard
*/
public DoubleQuery skip(int n) {
DoubleSkip skip = new DoubleSkip(this, n);
return new DoubleQuery(skip, skip);
}
/**
* Returns an {@link OptionalDouble} with the resulting reduction of the elements of this {@code DoubleQuery},
* if a reduction can be made, using the provided accumulator.
*/
public OptionalDouble reduce(DoubleBinaryOperator accumulator) {
DoubleBox box = new DoubleBox();
if (this.tryAdvance(box::setValue)) {
return OptionalDouble.of(this.reduce(box.getValue(), accumulator));
} else {
return OptionalDouble.empty();
}
}
/**
* Returns the result of the reduction of the elements of this {@code DoubleQuery},
* using the provided identity value and accumulator.
*/
public double reduce(double identity, DoubleBinaryOperator accumulator) {
class BoxAccumulator extends DoubleBox implements DoubleYield {
public BoxAccumulator(double identity) {
super(identity);
}
@Override
public void ret(double item) {
this.value = accumulator.applyAsDouble(value, item);
}
}
BoxAccumulator box = new BoxAccumulator(identity);
this.traverse(box);
return box.getValue();
}
/**
* Returns the lowest double of this {@code DoubleQuery}
*/
public OptionalDouble min() {
DoubleBox b = new DoubleBox();
this.traverse(e -> {
if (!b.isPresent()) {
b.turnPresent(e);
} else if (e < b.getValue()) {
b.setValue(e);
}
});
return b.isPresent() ? OptionalDouble.of(b.getValue()) : OptionalDouble.empty();
}
/**
* Returns the highest double of this {@code DoubleQuery}
*/
public OptionalDouble max() {
DoubleBox b = new DoubleBox();
this.traverse(e -> {
if (!b.isPresent()) {
b.turnPresent(e);
} else if (e > b.getValue()) {
b.setValue(e);
}
});
return b.isPresent() ? OptionalDouble.of(b.getValue()) : OptionalDouble.empty();
}
/**
* Returns the count of elements in this {@code DoubleQuery}.
*/
public final long count() {
class Counter implements DoubleYield {
long n = 0;
@Override
public void ret(double item) {
++n;
}
}
Counter c = new Counter();
this.traverse(c);
return c.n;
}
/**
* Returns an OptionalDouble describing the arithmetic mean of elements of this {@code DoubleQuery},
* or an empty optional if this {@code DoubleQuery} is empty. This is a special case of a reduction.
* <p>
* This is a terminal operation.
*/
public OptionalDouble average() {
double[] data = this.toArray();
double count = data.length;
if (count == 0) {
return OptionalDouble.empty();
}
double sum = DoubleQuery.of(data).sum();
return OptionalDouble.of(sum / count);
}
/**
* Returns the sum of elements in this {@code DoubleQuery} .
* <p>
* This is a special case of a reduction.
*/
public double sum() {
return this.reduce(0, Double::sum);
}
/**
* Returns an DoubleSummaryStatistics describing various summary data about
* the elements of this {@code DoubleQuery}. This is a special case of a reduction.
* <p>
* This is a terminal operation.
*/
public DoubleSummaryStatistics summaryStatistics() {
return this.collect(DoubleSummaryStatistics::new, DoubleSummaryStatistics::accept);
}
/**
* Performs a mutable reduction operation on the elements of this {@code DoubleQuery}.
* A mutable reduction is one in which the reduced value is a mutable result container, such as an ArrayList,
* and elements are incorporated by updating the state of the result rather than by replacing the result.
*/
public <R> R collect(Supplier<R> supplier, ObjDoubleConsumer<R> accumulator) {
R result = supplier.get();
this.traverse(elem -> accumulator.accept(result, elem));
return result;
}
/**
* Returns whether all elements of this {@code DoubleQuery} match the provided
* {@link DoublePredicate}. May not evaluate the predicate on all elements if not
* necessary for determining the result. If the query is empty then
* {@code true} is returned and the predicate is not evaluated.
*
* @param p DoublePredicate used to test elements of this {@code DoubleQuery}
*/
public boolean allMatch(DoublePredicate p) {
BoolBox succeed = new BoolBox(true);
shortCircuit(item -> {
if (!p.test(item)) {
succeed.set(false);
Yield.bye();
}
});
return succeed.isTrue();
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or the traversal
* exited normally through the invocation of yield.bye().
*/
public final void shortCircuit(DoubleYield yield) {
try {
this.trav.traverse(yield);
} catch (TraversableFinishError e) {
/* Proceed */
}
}
/**
* Returns whether no elements of this {@code DoubleQuery} match the provided
* {@link DoublePredicate}. May not evaluate the predicate on all elements if not
* necessary for determining the result. If the query is empty then
* {@code true} is returned and the predicate is not evaluated.
*
* @param p DoublePredicate used to test elements of this {@code DoubleQuery}
*/
public boolean noneMatch(DoublePredicate p) {
return !this.anyMatch(p);
}
/**
* Returns whether any elements of this {@code DoubleQuery} match the provided
* {@link DoublePredicate}. May not evaluate the predicate on all elements if not
* necessary for determining the result. If the query is empty then
* {@code false} is returned and the predicate is not evaluated.
*
* @param p DoublePredicate used to test elements of this {@code DoubleQuery}
*/
public boolean anyMatch(DoublePredicate p) {
BoolBox found = new BoolBox();
shortCircuit(item -> {
if (p.test(item)) {
found.set();
Yield.bye();
}
});
return found.isTrue();
}
/**
* Returns an {@link OptionalDouble} describing any element of this {@code DoubleQuery},
* or an empty {@code OptionalDouble} if this {@code DoubleQuery} is empty.
*/
public OptionalDouble findAny() {
return this.findFirst();
}
/**
* Returns an {@link OptionalDouble} describing the first element of this {@code DoubleQuery},
* or an empty {@code OptionalDouble} if this {@code DoubleQuery} is empty.
*/
public OptionalDouble findFirst() {
DoubleBox box = new DoubleBox();
this.tryAdvance(box::turnPresent);
return box.isPresent()
? OptionalDouble.of(box.getValue())
: OptionalDouble.empty();
}
/**
* Returns a {@code LongQuery} consisting of the elements of this {@code DoubleQuery},
* converted to long. It's equivalent to calling Math.round on every element
* <p>
* This is an intermediate operation.
*/
public LongQuery asLongQuery() {
return this.mapToLong(Math::round);
}
/**
* Returns a {@code LongQuery} consisting of the results of applying the given
* function to the elements of this {@code DoubleQuery}.
*
* @param function DoubleToLongFunction used to map the elements of this DoubleQuery
*/
public LongQuery mapToLong(DoubleToLongFunction function) {
return new LongQuery(LongAdvancer.from(adv, function), LongTraverser.from(trav, function));
}
/**
* Returns a {@code IntQuery} consisting of the elements of this {@code DoubleQuery},
* converted to int. It's equivalent to calling Math.round on every element
* <p>
* This is an intermediate operation.
*/
public IntQuery asIntQuery() {
return this.mapToInt(v -> (int) Math.round(v));
}
/**
* Returns a {@code IntQuery} consisting of the results of applying the given
* function to the elements of this {@code DoubleQuery}.
*
* @param function DoubleToIntFunction used to map the elements of this DoubleQuery
*/
public IntQuery mapToInt(DoubleToIntFunction function) {
return new IntQuery(IntAdvancer.from(adv, function), IntTraverser.from(trav, function));
}
/**
* Returns a Stream consisting of the elements of this {@code DoubleQuery},
* each boxed to an Double.
*/
public Query<Double> boxed() {
return new Query<>(adv, trav);
}
public DoubleStream toStream() {
Spliterator.OfDouble iter = new Spliterators.AbstractDoubleSpliterator(Long.MAX_VALUE, Spliterator.ORDERED) {
@Override
public boolean tryAdvance(DoubleConsumer action) {
return adv.tryAdvance(action::accept);
}
@Override
public void forEachRemaining(DoubleConsumer action) {
trav.traverse(action::accept);
}
};
return StreamSupport.doubleStream(iter, false);
}
/**
* The {@code then} operator lets you encapsulate a piece of an operator
* chain into a function.
* That function {@code next} is applied to this {@code DoubleQuery} to produce a new
* {@code DoubleTraverser} object that is encapsulated in the resulting {@code DoubleQuery}.
* On the other hand, the {@code nextAdv} is applied to this query to produce a new
* {@code DoubleAdvancer} object that is encapsulated in the resulting query.
*/
public final DoubleQuery then(
Function<DoubleQuery,
DoubleAdvancer> nextAdv,
Function<DoubleQuery, DoubleTraverser> next) {
return new DoubleQuery(nextAdv.apply(this), next.apply(this));
}
/**
* The {@code then} operator lets you encapsulate a piece of an operator
* chain into a function.
* That function {@code next} is applied to this {@code DoubleQuery} to produce a new
* {@code DoubleTraverser} object that is encapsulated in the resulting {@code DoubleQuery}.
*/
public final DoubleQuery then(Function<DoubleQuery, DoubleTraverser> next) {
DoubleAdvancer nextAdv = item -> {
throw new UnsupportedOperationException(
"Missing tryAdvance() implementation! Use the overloaded then() providing both Advancer and Traverser!");
};
return new DoubleQuery(nextAdv, next.apply(this));
}
/**
* Returns a {@code DoubleQuery} consisting of the longest prefix of elements taken from
* this {@code DoubleQuery} that match the given predicate.
*/
public final DoubleQuery takeWhile(DoublePredicate predicate) {
DoubleTakeWhile take = new DoubleTakeWhile(this, predicate);
return new DoubleQuery(take, take);
}
/**
* Creates a concatenated {@code Query} in which the elements are
* all the elements of this {@code Query} followed by all the
* elements of the other {@code Query}.
*/
public final DoubleQuery concat(DoubleQuery other) {
DoubleConcat cat = new DoubleConcat(this, other);
return new DoubleQuery(cat, cat);
}
/**
* Returns a {@code DoubleQuery} consisting of the remaining elements of this query
* after discarding the first sequence of elements that match the given Predicate.
*/
public final DoubleQuery dropWhile(DoublePredicate predicate) {
DoubleDropWhile drop = new DoubleDropWhile(this, predicate);
return new DoubleQuery(drop, drop);
}
/**
* Applies a specified function to the corresponding elements of two
* sequences, producing a sequence of the results.
*/
public final DoubleQuery zip(DoubleQuery other, DoubleBinaryOperator zipper) {
DoubleZip zip = new DoubleZip(this, other, zipper);
return new DoubleQuery(zip, zip);
}
}

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package org.xbib.event.yield.primitives.dbl;
import org.xbib.event.yield.Traverser;
import org.xbib.event.yield.Yield;
import org.xbib.event.yield.primitives.intgr.IntTraverser;
import org.xbib.event.yield.primitives.lng.LongTraverser;
import java.util.function.DoubleToLongFunction;
import java.util.function.IntToDoubleFunction;
import java.util.function.LongToDoubleFunction;
import java.util.function.ToDoubleFunction;
/**
* Bulk traversal.
* We use a traverse method as its first choice to
* implement Query operations.
* This is a special kind of traversal that disallows individually access.
*/
public interface DoubleTraverser extends Traverser<Double> {
/**
* An DoubleTraverser object without elements.
*/
static DoubleTraverser empty() {
return action -> {
};
}
/**
* A DoubleTraverser object from a generic {@link Traverser} mapped by a {@link ToDoubleFunction}.
*
* @param source {@link Traverser} with the source elements for this {@code DoubleTraverser}.
* @param mapper {@link ToDoubleFunction} that specifies how to map the source elements double values.
*/
static <T> DoubleTraverser from(Traverser<T> source, ToDoubleFunction<? super T> mapper) {
return yield -> source.traverse(item -> yield.ret(mapper.applyAsDouble(item)));
}
/**
* A DoubleTraverser object from a {@link LongTraverser} mapped by a {@link LongToDoubleFunction}.
*
* @param source {@link LongTraverser} with the source elements for this {@code LongTraverser}.
* @param mapper {@link DoubleToLongFunction} that specifies how to map the source elements into double values.
*/
static DoubleTraverser from(LongTraverser source, LongToDoubleFunction mapper) {
return from((Traverser<Long>) source, mapper::applyAsDouble);
}
/**
* A DoubleTraverser object from a {@link IntTraverser} mapped by a {@link IntToDoubleFunction}.
*
* @param source {@link IntTraverser} with the source elements for this {@code LongTraverser}.
* @param mapper {@link IntToDoubleFunction} that specifies how to map the source elements into double values.
*/
static DoubleTraverser from(IntTraverser source, IntToDoubleFunction mapper) {
return from((Traverser<Integer>) source, mapper::applyAsDouble);
}
/**
* Default traverse implementation that calls the
* primitive version of it
*/
@Override
default void traverse(Yield<? super Double> yield) {
DoubleYield yld = yield::ret;
this.traverse(yld);
}
/**
* Yields elements sequentially in the current thread,
* until all elements have been processed or an
* exception is thrown.
*/
void traverse(DoubleYield yield);
}

16
src/main/java/org/xbib/event/yield/primitives/dbl/DoubleYield.java
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package org.xbib.event.yield.primitives.dbl;
import org.xbib.event.yield.Yield;
/**
* Equivalent to {@code DoubleConsumer} with a yield semantics.
*/
@FunctionalInterface
public interface DoubleYield extends Yield<Double> {
void ret(double item);
@Override
default void ret(Double item) {
this.ret((double) item);
}
}

29
src/main/java/org/xbib/event/yield/primitives/dbl/ops/DoubleConcat.java
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package org.xbib.event.yield.primitives.dbl.ops;
import org.xbib.event.yield.primitives.dbl.DoubleAdvancer;
import org.xbib.event.yield.primitives.dbl.DoubleQuery;
import org.xbib.event.yield.primitives.dbl.DoubleTraverser;
import org.xbib.event.yield.primitives.dbl.DoubleYield;
public class DoubleConcat implements DoubleAdvancer, DoubleTraverser {
private final DoubleQuery first;
private final DoubleQuery second;
public DoubleConcat(DoubleQuery first, DoubleQuery second) {
this.first = first;
this.second = second;
}
@Override
public void traverse(DoubleYield yield) {
this.first.traverse(yield);
this.second.traverse(yield);
}
@Override
public boolean tryAdvance(DoubleYield yield) {
return first.tryAdvance(yield) || second.tryAdvance(yield);
}
}

41
src/main/java/org/xbib/event/yield/primitives/dbl/ops/DoubleDistinct.java
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package org.xbib.event.yield.primitives.dbl.ops;
import org.xbib.event.yield.boxes.BoolBox;
import org.xbib.event.yield.primitives.dbl.DoubleAdvancer;
import org.xbib.event.yield.primitives.dbl.DoubleQuery;
import org.xbib.event.yield.primitives.dbl.DoubleTraverser;
import org.xbib.event.yield.primitives.dbl.DoubleYield;
import java.util.HashSet;
public class DoubleDistinct implements DoubleAdvancer, DoubleTraverser {
final HashSet<Double> mem = new HashSet<>();
private final DoubleQuery upstream;
public DoubleDistinct(DoubleQuery adv) {
this.upstream = adv;
}
@Override
public void traverse(DoubleYield yield) {
upstream.traverse(item -> {
if (mem.add(item)) {
yield.ret(item);
}
});
}
@Override
public boolean tryAdvance(DoubleYield yield) {
final BoolBox found = new BoolBox();
while (found.isFalse() && upstream.tryAdvance(item -> {
if (mem.add(item)) {
yield.ret(item);
found.set();
}
})) ;
return found.isTrue();
}
}

54
src/main/java/org/xbib/event/yield/primitives/dbl/ops/DoubleDropWhile.java
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package org.xbib.event.yield.primitives.dbl.ops;
import org.xbib.event.yield.primitives.dbl.DoubleAdvancer;
import org.xbib.event.yield.primitives.dbl.DoubleQuery;
import org.xbib.event.yield.primitives.dbl.DoubleTraverser;
import org.xbib.event.yield.primitives.dbl.DoubleYield;
import java.util.function.DoublePredicate;
public class DoubleDropWhile implements DoubleAdvancer, DoubleTraverser {
private final DoubleQuery upstream;
private final DoublePredicate predicate;
private boolean dropped;
public DoubleDropWhile(DoubleQuery upstream, DoublePredicate predicate) {
this.upstream = upstream;
this.predicate = predicate;
this.dropped = false;
}
@Override
public void traverse(DoubleYield yield) {
upstream.traverse(item -> {
if (!dropped && !predicate.test(item)) {
dropped = true;
}
if (dropped) {
yield.ret(item);
}
});
}
@Override
public boolean tryAdvance(DoubleYield yield) {
if (dropped) {
return upstream.tryAdvance(yield);
} else {
while (!dropped && dropNext(yield)) {
// Intentionally empty. Action specified on yield statement of tryAdvance().
}
return dropped;
}
}
private boolean dropNext(DoubleYield yield) {
return upstream.tryAdvance(item -> {
if (!predicate.test(item)) {
dropped = true;
yield.ret(item);
}
});
}
}

45
src/main/java/org/xbib/event/yield/primitives/dbl/ops/DoubleFilter.java
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package org.xbib.event.yield.primitives.dbl.ops;
import org.xbib.event.yield.boxes.BoolBox;
import org.xbib.event.yield.primitives.dbl.DoubleAdvancer;
import org.xbib.event.yield.primitives.dbl.DoubleQuery;
import org.xbib.event.yield.primitives.dbl.DoubleTraverser;
import org.xbib.event.yield.primitives.dbl.DoubleYield;
import java.util.function.DoublePredicate;
public class DoubleFilter implements DoubleAdvancer, DoubleTraverser {
private final DoubleQuery upstream;
private final DoublePredicate p;
public DoubleFilter(DoubleQuery adv, DoublePredicate p) {
this.upstream = adv;
this.p = p;
}
@Override
public void traverse(DoubleYield yield) {
upstream.traverse(e -> {
if (p.test(e)) {
yield.ret(e);
}
});
}
@Override
public boolean tryAdvance(DoubleYield yield) {
BoolBox found = new BoolBox();
while (found.isFalse()) {
boolean hasNext = upstream.tryAdvance(item -> {
if (p.test(item)) {
yield.ret(item);
found.set();
}
});
if (!hasNext) break;
}
return found.isTrue();
}
}

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