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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.maybe;
import java.util.concurrent.atomic.AtomicBoolean;
import io.reactivex.*;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.disposables.EmptyDisposable;
import io.reactivex.plugins.RxJavaPlugins;
/**
* Signals the event of the first MaybeSource that signals.
*
* @param the value type emitted
*/
public final class MaybeAmb extends Maybe {
private final MaybeSource[] sources;
private final Iterable> sourcesIterable;
public MaybeAmb(MaybeSource[] sources, Iterable> sourcesIterable) {
this.sources = sources;
this.sourcesIterable = sourcesIterable;
}
@Override
@SuppressWarnings("unchecked")
protected void subscribeActual(MaybeObserver observer) {
MaybeSource[] sources = this.sources;
int count = 0;
if (sources == null) {
sources = new MaybeSource[8];
try {
for (MaybeSource element : sourcesIterable) {
if (element == null) {
EmptyDisposable.error(new NullPointerException("One of the sources is null"), observer);
return;
}
if (count == sources.length) {
MaybeSource[] b = new MaybeSource[count + (count >> 2)];
System.arraycopy(sources, 0, b, 0, count);
sources = b;
}
sources[count++] = element;
}
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptyDisposable.error(e, observer);
return;
}
} else {
count = sources.length;
}
CompositeDisposable set = new CompositeDisposable();
observer.onSubscribe(set);
AtomicBoolean winner = new AtomicBoolean();
for (int i = 0; i < count; i++) {
MaybeSource s = sources[i];
if (set.isDisposed()) {
return;
}
if (s == null) {
set.dispose();
NullPointerException ex = new NullPointerException("One of the MaybeSources is null");
if (winner.compareAndSet(false, true)) {
observer.onError(ex);
} else {
RxJavaPlugins.onError(ex);
}
return;
}
s.subscribe(new AmbMaybeObserver(observer, set, winner));
}
if (count == 0) {
observer.onComplete();
}
}
static final class AmbMaybeObserver
implements MaybeObserver {
final MaybeObserver downstream;
final AtomicBoolean winner;
final CompositeDisposable set;
Disposable upstream;
AmbMaybeObserver(MaybeObserver downstream, CompositeDisposable set, AtomicBoolean winner) {
this.downstream = downstream;
this.set = set;
this.winner = winner;
}
@Override
public void onSubscribe(Disposable d) {
upstream = d;
set.add(d);
}
@Override
public void onSuccess(T value) {
if (winner.compareAndSet(false, true)) {
set.delete(upstream);
set.dispose();
downstream.onSuccess(value);
}
}
@Override
public void onError(Throwable e) {
if (winner.compareAndSet(false, true)) {
set.delete(upstream);
set.dispose();
downstream.onError(e);
} else {
RxJavaPlugins.onError(e);
}
}
@Override
public void onComplete() {
if (winner.compareAndSet(false, true)) {
set.delete(upstream);
set.dispose();
downstream.onComplete();
}
}
}
}