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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.observable;
import java.util.concurrent.atomic.*;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.util.AtomicThrowable;
import io.reactivex.plugins.RxJavaPlugins;
public final class ObservableCombineLatest extends Observable {
final ObservableSource[] sources;
final Iterable> sourcesIterable;
final Function combiner;
final int bufferSize;
final boolean delayError;
public ObservableCombineLatest(ObservableSource[] sources,
Iterable> sourcesIterable,
Function combiner, int bufferSize,
boolean delayError) {
this.sources = sources;
this.sourcesIterable = sourcesIterable;
this.combiner = combiner;
this.bufferSize = bufferSize;
this.delayError = delayError;
}
@Override
@SuppressWarnings("unchecked")
public void subscribeActual(Observer observer) {
ObservableSource[] sources = this.sources;
int count = 0;
if (sources == null) {
sources = new Observable[8];
for (ObservableSource p : sourcesIterable) {
if (count == sources.length) {
ObservableSource[] b = new ObservableSource[count + (count >> 2)];
System.arraycopy(sources, 0, b, 0, count);
sources = b;
}
sources[count++] = p;
}
} else {
count = sources.length;
}
if (count == 0) {
EmptyDisposable.complete(observer);
return;
}
LatestCoordinator lc = new LatestCoordinator(observer, combiner, count, bufferSize, delayError);
lc.subscribe(sources);
}
static final class LatestCoordinator extends AtomicInteger implements Disposable {
private static final long serialVersionUID = 8567835998786448817L;
final Observer downstream;
final Function combiner;
final CombinerObserver[] observers;
Object[] latest;
final SpscLinkedArrayQueue queue;
final boolean delayError;
volatile boolean cancelled;
volatile boolean done;
final AtomicThrowable errors = new AtomicThrowable();
int active;
int complete;
@SuppressWarnings("unchecked")
LatestCoordinator(Observer actual,
Function combiner,
int count, int bufferSize, boolean delayError) {
this.downstream = actual;
this.combiner = combiner;
this.delayError = delayError;
this.latest = new Object[count];
CombinerObserver[] as = new CombinerObserver[count];
for (int i = 0; i < count; i++) {
as[i] = new CombinerObserver(this, i);
}
this.observers = as;
this.queue = new SpscLinkedArrayQueue(bufferSize);
}
public void subscribe(ObservableSource[] sources) {
Observer[] as = observers;
int len = as.length;
downstream.onSubscribe(this);
for (int i = 0; i < len; i++) {
if (done || cancelled) {
return;
}
sources[i].subscribe(as[i]);
}
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
cancelSources();
if (getAndIncrement() == 0) {
clear(queue);
}
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
void cancelSources() {
for (CombinerObserver observer : observers) {
observer.dispose();
}
}
void clear(SpscLinkedArrayQueue q) {
synchronized (this) {
latest = null;
}
q.clear();
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
final SpscLinkedArrayQueue q = queue;
final Observer a = downstream;
final boolean delayError = this.delayError;
int missed = 1;
for (;;) {
for (;;) {
if (cancelled) {
clear(q);
return;
}
if (!delayError && errors.get() != null) {
cancelSources();
clear(q);
a.onError(errors.terminate());
return;
}
boolean d = done;
Object[] s = q.poll();
boolean empty = s == null;
if (d && empty) {
clear(q);
Throwable ex = errors.terminate();
if (ex == null) {
a.onComplete();
} else {
a.onError(ex);
}
return;
}
if (empty) {
break;
}
R v;
try {
v = ObjectHelper.requireNonNull(combiner.apply(s), "The combiner returned a null value");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
errors.addThrowable(ex);
cancelSources();
clear(q);
ex = errors.terminate();
a.onError(ex);
return;
}
a.onNext(v);
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
void innerNext(int index, T item) {
boolean shouldDrain = false;
synchronized (this) {
Object[] latest = this.latest;
if (latest == null) {
return;
}
Object o = latest[index];
int a = active;
if (o == null) {
active = ++a;
}
latest[index] = item;
if (a == latest.length) {
queue.offer(latest.clone());
shouldDrain = true;
}
}
if (shouldDrain) {
drain();
}
}
void innerError(int index, Throwable ex) {
if (errors.addThrowable(ex)) {
boolean cancelOthers = true;
if (delayError) {
synchronized (this) {
Object[] latest = this.latest;
if (latest == null) {
return;
}
cancelOthers = latest[index] == null;
if (cancelOthers || ++complete == latest.length) {
done = true;
}
}
}
if (cancelOthers) {
cancelSources();
}
drain();
} else {
RxJavaPlugins.onError(ex);
}
}
void innerComplete(int index) {
boolean cancelOthers = false;
synchronized (this) {
Object[] latest = this.latest;
if (latest == null) {
return;
}
cancelOthers = latest[index] == null;
if (cancelOthers || ++complete == latest.length) {
done = true;
}
}
if (cancelOthers) {
cancelSources();
}
drain();
}
}
static final class CombinerObserver extends AtomicReference implements Observer {
private static final long serialVersionUID = -4823716997131257941L;
final LatestCoordinator parent;
final int index;
CombinerObserver(LatestCoordinator parent, int index) {
this.parent = parent;
this.index = index;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(this, d);
}
@Override
public void onNext(T t) {
parent.innerNext(index, t);
}
@Override
public void onError(Throwable t) {
parent.innerError(index, t);
}
@Override
public void onComplete() {
parent.innerComplete(index);
}
public void dispose() {
DisposableHelper.dispose(this);
}
}
}
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