rx.internal.operators.OnSubscribeFlatMapCompletable Maven / Gradle / Ivy
/**
* Copyright 2017 Netflix, Inc.
*
* 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 rx.internal.operators;
import java.util.concurrent.atomic.*;
import rx.*;
import rx.exceptions.Exceptions;
import rx.functions.Func1;
import rx.internal.util.ExceptionsUtils;
import rx.plugins.RxJavaHooks;
import rx.subscriptions.CompositeSubscription;
/**
* Maps upstream values to Completables and merges them, up to a given
* number of them concurrently, optionally delaying errors.
* History: 1.2.7 - experimental
* @param the upstream value type
* @since 1.3
*/
public final class OnSubscribeFlatMapCompletable implements Observable.OnSubscribe {
final Observable source;
final Func1 mapper;
final boolean delayErrors;
final int maxConcurrency;
public OnSubscribeFlatMapCompletable(Observable source, Func1 mapper,
boolean delayErrors, int maxConcurrency) {
if (mapper == null) {
throw new NullPointerException("mapper is null");
}
if (maxConcurrency <= 0) {
throw new IllegalArgumentException("maxConcurrency > 0 required but it was " + maxConcurrency);
}
this.source = source;
this.mapper = mapper;
this.delayErrors = delayErrors;
this.maxConcurrency = maxConcurrency;
}
@Override
public void call(Subscriber child) {
FlatMapCompletableSubscriber parent = new FlatMapCompletableSubscriber(child, mapper, delayErrors, maxConcurrency);
child.add(parent);
child.add(parent.set);
source.unsafeSubscribe(parent);
}
static final class FlatMapCompletableSubscriber extends Subscriber {
final Subscriber actual;
final Func1 mapper;
final boolean delayErrors;
final int maxConcurrency;
final AtomicInteger wip;
final CompositeSubscription set;
final AtomicReference errors;
FlatMapCompletableSubscriber(Subscriber actual, Func1 mapper,
boolean delayErrors, int maxConcurrency) {
this.actual = actual;
this.mapper = mapper;
this.delayErrors = delayErrors;
this.maxConcurrency = maxConcurrency;
this.wip = new AtomicInteger(1);
this.errors = new AtomicReference();
this.set = new CompositeSubscription();
this.request(maxConcurrency != Integer.MAX_VALUE ? maxConcurrency : Long.MAX_VALUE);
}
@Override
public void onNext(T t) {
Completable c;
try {
c = mapper.call(t);
if (c == null) {
throw new NullPointerException("The mapper returned a null Completable");
}
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
unsubscribe();
onError(ex);
return;
}
InnerSubscriber inner = new InnerSubscriber();
set.add(inner);
wip.getAndIncrement();
c.unsafeSubscribe(inner);
}
@Override
public void onError(Throwable e) {
if (delayErrors) {
ExceptionsUtils.addThrowable(errors, e);
onCompleted();
} else {
set.unsubscribe();
if (errors.compareAndSet(null, e)) {
actual.onError(ExceptionsUtils.terminate(errors));
} else {
RxJavaHooks.onError(e);
}
}
}
@Override
public void onCompleted() {
done();
}
boolean done() {
if (wip.decrementAndGet() == 0) {
Throwable ex = ExceptionsUtils.terminate(errors);
if (ex != null) {
actual.onError(ex);
} else {
actual.onCompleted();
}
return true;
}
return false;
}
public void innerError(InnerSubscriber inner, Throwable e) {
set.remove(inner);
if (delayErrors) {
ExceptionsUtils.addThrowable(errors, e);
if (!done() && maxConcurrency != Integer.MAX_VALUE) {
request(1);
}
} else {
set.unsubscribe();
unsubscribe();
if (errors.compareAndSet(null, e)) {
actual.onError(ExceptionsUtils.terminate(errors));
} else {
RxJavaHooks.onError(e);
}
}
}
public void innerComplete(InnerSubscriber inner) {
set.remove(inner);
if (!done() && maxConcurrency != Integer.MAX_VALUE) {
request(1);
}
}
final class InnerSubscriber
extends AtomicReference
implements CompletableSubscriber, Subscription {
private static final long serialVersionUID = -8588259593722659900L;
@Override
public void unsubscribe() {
Subscription s = getAndSet(this);
if (s != null && s != this) {
s.unsubscribe();
}
}
@Override
public boolean isUnsubscribed() {
return get() == this;
}
@Override
public void onCompleted() {
innerComplete(this);
}
@Override
public void onError(Throwable e) {
innerError(this, e);
}
@Override
public void onSubscribe(Subscription d) {
if (!compareAndSet(null, d)) {
d.unsubscribe();
if (get() != this) {
RxJavaHooks.onError(new IllegalStateException("Subscription already set!"));
}
}
}
}
}
}