io.reactivex.internal.operators.mixed.ObservableSwitchMapCompletable Maven / Gradle / Ivy
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/**
* 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.mixed;
import java.util.concurrent.atomic.AtomicReference;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
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.util.*;
import io.reactivex.plugins.RxJavaPlugins;
/**
* Maps the upstream values into {@link CompletableSource}s, subscribes to the newer one while
* disposing the subscription to the previous {@code CompletableSource}, thus keeping at most one
* active {@code CompletableSource} running.
* History: 2.1.11 - experimental
* @param the upstream value type
* @since 2.2
*/
public final class ObservableSwitchMapCompletable extends Completable {
final Observable source;
final Function mapper;
final boolean delayErrors;
public ObservableSwitchMapCompletable(Observable source,
Function mapper, boolean delayErrors) {
this.source = source;
this.mapper = mapper;
this.delayErrors = delayErrors;
}
@Override
protected void subscribeActual(CompletableObserver observer) {
if (!ScalarXMapZHelper.tryAsCompletable(source, mapper, observer)) {
source.subscribe(new SwitchMapCompletableObserver(observer, mapper, delayErrors));
}
}
static final class SwitchMapCompletableObserver implements Observer, Disposable {
final CompletableObserver downstream;
final Function mapper;
final boolean delayErrors;
final AtomicThrowable errors;
final AtomicReference inner;
static final SwitchMapInnerObserver INNER_DISPOSED = new SwitchMapInnerObserver(null);
volatile boolean done;
Disposable upstream;
SwitchMapCompletableObserver(CompletableObserver downstream,
Function mapper, boolean delayErrors) {
this.downstream = downstream;
this.mapper = mapper;
this.delayErrors = delayErrors;
this.errors = new AtomicThrowable();
this.inner = new AtomicReference();
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
CompletableSource c;
try {
c = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null CompletableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.dispose();
onError(ex);
return;
}
SwitchMapInnerObserver o = new SwitchMapInnerObserver(this);
for (;;) {
SwitchMapInnerObserver current = inner.get();
if (current == INNER_DISPOSED) {
break;
}
if (inner.compareAndSet(current, o)) {
if (current != null) {
current.dispose();
}
c.subscribe(o);
break;
}
}
}
@Override
public void onError(Throwable t) {
if (errors.addThrowable(t)) {
if (delayErrors) {
onComplete();
} else {
disposeInner();
Throwable ex = errors.terminate();
if (ex != ExceptionHelper.TERMINATED) {
downstream.onError(ex);
}
}
} else {
RxJavaPlugins.onError(t);
}
}
@Override
public void onComplete() {
done = true;
if (inner.get() == null) {
Throwable ex = errors.terminate();
if (ex == null) {
downstream.onComplete();
} else {
downstream.onError(ex);
}
}
}
void disposeInner() {
SwitchMapInnerObserver o = inner.getAndSet(INNER_DISPOSED);
if (o != null && o != INNER_DISPOSED) {
o.dispose();
}
}
@Override
public void dispose() {
upstream.dispose();
disposeInner();
}
@Override
public boolean isDisposed() {
return inner.get() == INNER_DISPOSED;
}
void innerError(SwitchMapInnerObserver sender, Throwable error) {
if (inner.compareAndSet(sender, null)) {
if (errors.addThrowable(error)) {
if (delayErrors) {
if (done) {
Throwable ex = errors.terminate();
downstream.onError(ex);
}
} else {
dispose();
Throwable ex = errors.terminate();
if (ex != ExceptionHelper.TERMINATED) {
downstream.onError(ex);
}
}
return;
}
}
RxJavaPlugins.onError(error);
}
void innerComplete(SwitchMapInnerObserver sender) {
if (inner.compareAndSet(sender, null)) {
if (done) {
Throwable ex = errors.terminate();
if (ex == null) {
downstream.onComplete();
} else {
downstream.onError(ex);
}
}
}
}
static final class SwitchMapInnerObserver extends AtomicReference
implements CompletableObserver {
private static final long serialVersionUID = -8003404460084760287L;
final SwitchMapCompletableObserver parent;
SwitchMapInnerObserver(SwitchMapCompletableObserver parent) {
this.parent = parent;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(this, d);
}
@Override
public void onError(Throwable e) {
parent.innerError(this, e);
}
@Override
public void onComplete() {
parent.innerComplete(this);
}
void dispose() {
DisposableHelper.dispose(this);
}
}
}
}