io.reactivex.internal.operators.observable.ObservableZip Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
Show all versions of rxjava Show documentation
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 io.reactivex.internal.functions.ObjectHelper;
import java.util.Arrays;
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.queue.SpscLinkedArrayQueue;
public final class ObservableZip extends Observable {
final ObservableSource[] sources;
final Iterable> sourcesIterable;
final Function zipper;
final int bufferSize;
final boolean delayError;
public ObservableZip(ObservableSource[] sources,
Iterable> sourcesIterable,
Function zipper,
int bufferSize,
boolean delayError) {
this.sources = sources;
this.sourcesIterable = sourcesIterable;
this.zipper = zipper;
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 ObservableSource[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;
}
ZipCoordinator zc = new ZipCoordinator(observer, zipper, count, delayError);
zc.subscribe(sources, bufferSize);
}
static final class ZipCoordinator extends AtomicInteger implements Disposable {
private static final long serialVersionUID = 2983708048395377667L;
final Observer downstream;
final Function zipper;
final ZipObserver[] observers;
final T[] row;
final boolean delayError;
volatile boolean cancelled;
@SuppressWarnings("unchecked")
ZipCoordinator(Observer actual,
Function zipper,
int count, boolean delayError) {
this.downstream = actual;
this.zipper = zipper;
this.observers = new ZipObserver[count];
this.row = (T[])new Object[count];
this.delayError = delayError;
}
public void subscribe(ObservableSource[] sources, int bufferSize) {
ZipObserver[] s = observers;
int len = s.length;
for (int i = 0; i < len; i++) {
s[i] = new ZipObserver(this, bufferSize);
}
// this makes sure the contents of the observers array is visible
this.lazySet(0);
downstream.onSubscribe(this);
for (int i = 0; i < len; i++) {
if (cancelled) {
return;
}
sources[i].subscribe(s[i]);
}
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
cancelSources();
if (getAndIncrement() == 0) {
clear();
}
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
void cancel() {
clear();
cancelSources();
}
void cancelSources() {
for (ZipObserver zs : observers) {
zs.dispose();
}
}
void clear() {
for (ZipObserver zs : observers) {
zs.queue.clear();
}
}
public void drain() {
if (getAndIncrement() != 0) {
return;
}
int missing = 1;
final ZipObserver[] zs = observers;
final Observer a = downstream;
final T[] os = row;
final boolean delayError = this.delayError;
for (;;) {
for (;;) {
int i = 0;
int emptyCount = 0;
for (ZipObserver z : zs) {
if (os[i] == null) {
boolean d = z.done;
T v = z.queue.poll();
boolean empty = v == null;
if (checkTerminated(d, empty, a, delayError, z)) {
return;
}
if (!empty) {
os[i] = v;
} else {
emptyCount++;
}
} else {
if (z.done && !delayError) {
Throwable ex = z.error;
if (ex != null) {
cancelled = true;
cancel();
a.onError(ex);
return;
}
}
}
i++;
}
if (emptyCount != 0) {
break;
}
R v;
try {
v = ObjectHelper.requireNonNull(zipper.apply(os.clone()), "The zipper returned a null value");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancel();
a.onError(ex);
return;
}
a.onNext(v);
Arrays.fill(os, null);
}
missing = addAndGet(-missing);
if (missing == 0) {
return;
}
}
}
boolean checkTerminated(boolean d, boolean empty, Observer a, boolean delayError, ZipObserver source) {
if (cancelled) {
cancel();
return true;
}
if (d) {
if (delayError) {
if (empty) {
Throwable e = source.error;
cancelled = true;
cancel();
if (e != null) {
a.onError(e);
} else {
a.onComplete();
}
return true;
}
} else {
Throwable e = source.error;
if (e != null) {
cancelled = true;
cancel();
a.onError(e);
return true;
} else
if (empty) {
cancelled = true;
cancel();
a.onComplete();
return true;
}
}
}
return false;
}
}
static final class ZipObserver implements Observer {
final ZipCoordinator parent;
final SpscLinkedArrayQueue queue;
volatile boolean done;
Throwable error;
final AtomicReference upstream = new AtomicReference();
ZipObserver(ZipCoordinator parent, int bufferSize) {
this.parent = parent;
this.queue = new SpscLinkedArrayQueue(bufferSize);
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(this.upstream, d);
}
@Override
public void onNext(T t) {
queue.offer(t);
parent.drain();
}
@Override
public void onError(Throwable t) {
error = t;
done = true;
parent.drain();
}
@Override
public void onComplete() {
done = true;
parent.drain();
}
public void dispose() {
DisposableHelper.dispose(upstream);
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy