97 lines
3.2 KiB
Java
97 lines
3.2 KiB
Java
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/*
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* Copyright 2016 Netflix, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package io.reactivex.netty.channel;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufHolder;
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import io.netty.channel.Channel;
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import rx.Observable;
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import rx.Subscriber;
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import rx.functions.Func1;
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/**
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* A source for any content/data read from a channel.
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*
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* <h2>Managing {@link ByteBuf} lifecycle.</h2>
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*
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* If this source emits {@link ByteBuf} or a {@link ByteBufHolder}, using {@link #autoRelease()} will release the buffer
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* after emitting it from this source.
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*
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* <h2>Replaying content</h2>
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*
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* Since, the content read from a channel is not re-readable, this also provides a {@link #replayable()} function that
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* produces a source which can be subscribed multiple times to replay the same data. This is specially useful if the
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* content read from one channel is written on to another with an option to retry.
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*
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* @param <T>
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*/
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public final class ContentSource<T> extends Observable<T> {
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private ContentSource(final Observable<T> source) {
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super(new OnSubscribe<T>() {
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@Override
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public void call(Subscriber<? super T> subscriber) {
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source.unsafeSubscribe(subscriber);
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}
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});
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}
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public ContentSource(final Channel channel, final Func1<Subscriber<? super T>, Object> subscriptionEventFactory) {
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super(new OnSubscribe<T>() {
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@Override
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public void call(Subscriber<? super T> subscriber) {
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channel.pipeline()
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.fireUserEventTriggered(subscriptionEventFactory.call(subscriber));
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}
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});
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}
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public ContentSource(final Throwable error) {
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super(new OnSubscribe<T>() {
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@Override
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public void call(Subscriber<? super T> subscriber) {
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subscriber.onError(error);
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}
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});
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}
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/**
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* If this source emits {@link ByteBuf} or {@link ByteBufHolder} then using this operator will release the buffer
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* after it is emitted from this source.
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*
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* @return A new instance of the stream with auto-release enabled.
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*/
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public Observable<T> autoRelease() {
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return this.lift(new AutoReleaseOperator<T>());
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}
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/**
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* This provides a replayable content source that only subscribes once to the actual content and then caches it,
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* till {@link DisposableContentSource#dispose()} is called.
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*
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* @return A new replayable content source.
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*/
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public DisposableContentSource<T> replayable() {
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return DisposableContentSource.createNew(this);
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}
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public <R> ContentSource<R> transform(Transformer<T, R> transformer) {
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return new ContentSource<>(transformer.call(this));
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}
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}
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