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Reactive Extensions for Java
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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
*
* http://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.
*/
package io.reactivex.internal.operators.observable;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.*;
import io.reactivex.plugins.RxJavaPlugins;
import static io.reactivex.internal.util.ExceptionHelper.timeoutMessage;
public final class ObservableTimeoutTimed extends AbstractObservableWithUpstream {
final long timeout;
final TimeUnit unit;
final Scheduler scheduler;
final ObservableSource other;
public ObservableTimeoutTimed(Observable source,
long timeout, TimeUnit unit, Scheduler scheduler, ObservableSource other) {
super(source);
this.timeout = timeout;
this.unit = unit;
this.scheduler = scheduler;
this.other = other;
}
@Override
protected void subscribeActual(Observer observer) {
if (other == null) {
TimeoutObserver parent = new TimeoutObserver(observer, timeout, unit, scheduler.createWorker());
observer.onSubscribe(parent);
parent.startTimeout(0L);
source.subscribe(parent);
} else {
TimeoutFallbackObserver parent = new TimeoutFallbackObserver(observer, timeout, unit, scheduler.createWorker(), other);
observer.onSubscribe(parent);
parent.startTimeout(0L);
source.subscribe(parent);
}
}
static final class TimeoutObserver extends AtomicLong
implements Observer, Disposable, TimeoutSupport {
private static final long serialVersionUID = 3764492702657003550L;
final Observer downstream;
final long timeout;
final TimeUnit unit;
final Scheduler.Worker worker;
final SequentialDisposable task;
final AtomicReference upstream;
TimeoutObserver(Observer actual, long timeout, TimeUnit unit, Scheduler.Worker worker) {
this.downstream = actual;
this.timeout = timeout;
this.unit = unit;
this.worker = worker;
this.task = new SequentialDisposable();
this.upstream = new AtomicReference();
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(upstream, d);
}
@Override
public void onNext(T t) {
long idx = get();
if (idx == Long.MAX_VALUE || !compareAndSet(idx, idx + 1)) {
return;
}
task.get().dispose();
downstream.onNext(t);
startTimeout(idx + 1);
}
void startTimeout(long nextIndex) {
task.replace(worker.schedule(new TimeoutTask(nextIndex, this), timeout, unit));
}
@Override
public void onError(Throwable t) {
if (getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
task.dispose();
downstream.onError(t);
worker.dispose();
} else {
RxJavaPlugins.onError(t);
}
}
@Override
public void onComplete() {
if (getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
task.dispose();
downstream.onComplete();
worker.dispose();
}
}
@Override
public void onTimeout(long idx) {
if (compareAndSet(idx, Long.MAX_VALUE)) {
DisposableHelper.dispose(upstream);
downstream.onError(new TimeoutException(timeoutMessage(timeout, unit)));
worker.dispose();
}
}
@Override
public void dispose() {
DisposableHelper.dispose(upstream);
worker.dispose();
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(upstream.get());
}
}
static final class TimeoutTask implements Runnable {
final TimeoutSupport parent;
final long idx;
TimeoutTask(long idx, TimeoutSupport parent) {
this.idx = idx;
this.parent = parent;
}
@Override
public void run() {
parent.onTimeout(idx);
}
}
static final class TimeoutFallbackObserver extends AtomicReference
implements Observer, Disposable, TimeoutSupport {
private static final long serialVersionUID = 3764492702657003550L;
final Observer downstream;
final long timeout;
final TimeUnit unit;
final Scheduler.Worker worker;
final SequentialDisposable task;
final AtomicLong index;
final AtomicReference upstream;
ObservableSource fallback;
TimeoutFallbackObserver(Observer actual, long timeout, TimeUnit unit,
Scheduler.Worker worker, ObservableSource fallback) {
this.downstream = actual;
this.timeout = timeout;
this.unit = unit;
this.worker = worker;
this.fallback = fallback;
this.task = new SequentialDisposable();
this.index = new AtomicLong();
this.upstream = new AtomicReference();
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(upstream, d);
}
@Override
public void onNext(T t) {
long idx = index.get();
if (idx == Long.MAX_VALUE || !index.compareAndSet(idx, idx + 1)) {
return;
}
task.get().dispose();
downstream.onNext(t);
startTimeout(idx + 1);
}
void startTimeout(long nextIndex) {
task.replace(worker.schedule(new TimeoutTask(nextIndex, this), timeout, unit));
}
@Override
public void onError(Throwable t) {
if (index.getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
task.dispose();
downstream.onError(t);
worker.dispose();
} else {
RxJavaPlugins.onError(t);
}
}
@Override
public void onComplete() {
if (index.getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
task.dispose();
downstream.onComplete();
worker.dispose();
}
}
@Override
public void onTimeout(long idx) {
if (index.compareAndSet(idx, Long.MAX_VALUE)) {
DisposableHelper.dispose(upstream);
ObservableSource f = fallback;
fallback = null;
f.subscribe(new FallbackObserver(downstream, this));
worker.dispose();
}
}
@Override
public void dispose() {
DisposableHelper.dispose(upstream);
DisposableHelper.dispose(this);
worker.dispose();
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(get());
}
}
static final class FallbackObserver implements Observer {
final Observer downstream;
final AtomicReference arbiter;
FallbackObserver(Observer actual, AtomicReference arbiter) {
this.downstream = actual;
this.arbiter = arbiter;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.replace(arbiter, d);
}
@Override
public void onNext(T t) {
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
downstream.onError(t);
}
@Override
public void onComplete() {
downstream.onComplete();
}
}
interface TimeoutSupport {
void onTimeout(long idx);
}
}
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