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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.rxjava3.internal.operators.completable;
import java.util.Iterator;
import java.util.Objects;
import java.util.concurrent.atomic.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.*;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class CompletableMergeIterable extends Completable {
final Iterable extends CompletableSource> sources;
public CompletableMergeIterable(Iterable extends CompletableSource> sources) {
this.sources = sources;
}
@Override
public void subscribeActual(final CompletableObserver observer) {
final CompositeDisposable set = new CompositeDisposable();
final AtomicInteger wip = new AtomicInteger(1);
MergeCompletableObserver shared = new MergeCompletableObserver(observer, set, wip);
observer.onSubscribe(shared);
Iterator extends CompletableSource> iterator;
try {
iterator = Objects.requireNonNull(sources.iterator(), "The source iterator returned is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
observer.onError(e);
return;
}
for (;;) {
if (set.isDisposed()) {
return;
}
boolean b;
try {
b = iterator.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
set.dispose();
shared.onError(e);
return;
}
if (!b) {
break;
}
if (set.isDisposed()) {
return;
}
CompletableSource c;
try {
c = Objects.requireNonNull(iterator.next(), "The iterator returned a null CompletableSource");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
set.dispose();
shared.onError(e);
return;
}
if (set.isDisposed()) {
return;
}
wip.getAndIncrement();
c.subscribe(shared);
}
shared.onComplete();
}
static final class MergeCompletableObserver extends AtomicBoolean implements CompletableObserver, Disposable {
private static final long serialVersionUID = -7730517613164279224L;
final CompositeDisposable set;
final CompletableObserver downstream;
final AtomicInteger wip;
MergeCompletableObserver(CompletableObserver actual, CompositeDisposable set, AtomicInteger wip) {
this.downstream = actual;
this.set = set;
this.wip = wip;
}
@Override
public void onSubscribe(Disposable d) {
set.add(d);
}
@Override
public void onError(Throwable e) {
set.dispose();
if (compareAndSet(false, true)) {
downstream.onError(e);
} else {
RxJavaPlugins.onError(e);
}
}
@Override
public void onComplete() {
if (wip.decrementAndGet() == 0) {
// errors don't decrement wip
downstream.onComplete();
}
}
@Override
public void dispose() {
set.dispose();
set(true);
}
@Override
public boolean isDisposed() {
return set.isDisposed();
}
}
}
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