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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.flowable;
import java.util.concurrent.atomic.AtomicReference;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.annotations.Nullable;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.subscriptions.*;
import io.reactivex.internal.util.AtomicThrowable;
import io.reactivex.plugins.RxJavaPlugins;
/**
* Maps a sequence of values into CompletableSources and awaits their termination.
* @param the value type
*/
public final class FlowableFlatMapCompletable extends AbstractFlowableWithUpstream {
final Function super T, ? extends CompletableSource> mapper;
final int maxConcurrency;
final boolean delayErrors;
public FlowableFlatMapCompletable(Flowable source,
Function super T, ? extends CompletableSource> mapper, boolean delayErrors,
int maxConcurrency) {
super(source);
this.mapper = mapper;
this.delayErrors = delayErrors;
this.maxConcurrency = maxConcurrency;
}
@Override
protected void subscribeActual(Subscriber super T> subscriber) {
source.subscribe(new FlatMapCompletableMainSubscriber(subscriber, mapper, delayErrors, maxConcurrency));
}
static final class FlatMapCompletableMainSubscriber extends BasicIntQueueSubscription
implements FlowableSubscriber {
private static final long serialVersionUID = 8443155186132538303L;
final Subscriber super T> downstream;
final AtomicThrowable errors;
final Function super T, ? extends CompletableSource> mapper;
final boolean delayErrors;
final CompositeDisposable set;
final int maxConcurrency;
Subscription upstream;
volatile boolean cancelled;
FlatMapCompletableMainSubscriber(Subscriber super T> subscriber,
Function super T, ? extends CompletableSource> mapper, boolean delayErrors,
int maxConcurrency) {
this.downstream = subscriber;
this.mapper = mapper;
this.delayErrors = delayErrors;
this.errors = new AtomicThrowable();
this.set = new CompositeDisposable();
this.maxConcurrency = maxConcurrency;
this.lazySet(1);
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
int m = maxConcurrency;
if (m == Integer.MAX_VALUE) {
s.request(Long.MAX_VALUE);
} else {
s.request(m);
}
}
}
@Override
public void onNext(T value) {
CompletableSource cs;
try {
cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.cancel();
onError(ex);
return;
}
getAndIncrement();
InnerConsumer inner = new InnerConsumer();
if (!cancelled && set.add(inner)) {
cs.subscribe(inner);
}
}
@Override
public void onError(Throwable e) {
if (errors.addThrowable(e)) {
if (delayErrors) {
if (decrementAndGet() == 0) {
Throwable ex = errors.terminate();
downstream.onError(ex);
} else {
if (maxConcurrency != Integer.MAX_VALUE) {
upstream.request(1);
}
}
} else {
cancel();
if (getAndSet(0) > 0) {
Throwable ex = errors.terminate();
downstream.onError(ex);
}
}
} else {
RxJavaPlugins.onError(e);
}
}
@Override
public void onComplete() {
if (decrementAndGet() == 0) {
Throwable ex = errors.terminate();
if (ex != null) {
downstream.onError(ex);
} else {
downstream.onComplete();
}
} else {
if (maxConcurrency != Integer.MAX_VALUE) {
upstream.request(1);
}
}
}
@Override
public void cancel() {
cancelled = true;
upstream.cancel();
set.dispose();
}
@Override
public void request(long n) {
// ignored, no values emitted
}
@Nullable
@Override
public T poll() throws Exception {
return null; // always empty
}
@Override
public boolean isEmpty() {
return true; // always empty
}
@Override
public void clear() {
// nothing to clear
}
@Override
public int requestFusion(int mode) {
return mode & ASYNC;
}
void innerComplete(InnerConsumer inner) {
set.delete(inner);
onComplete();
}
void innerError(InnerConsumer inner, Throwable e) {
set.delete(inner);
onError(e);
}
final class InnerConsumer extends AtomicReference implements CompletableObserver, Disposable {
private static final long serialVersionUID = 8606673141535671828L;
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(this, d);
}
@Override
public void onComplete() {
innerComplete(this);
}
@Override
public void onError(Throwable e) {
innerError(this, e);
}
@Override
public void dispose() {
DisposableHelper.dispose(this);
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(get());
}
}
}
}
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