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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* 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.observable;
import java.util.concurrent.atomic.AtomicInteger;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.BiPredicate;
import io.reactivex.rxjava3.internal.disposables.ArrayCompositeDisposable;
import io.reactivex.rxjava3.internal.fuseable.FuseToObservable;
import io.reactivex.rxjava3.operators.SpscLinkedArrayQueue;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class ObservableSequenceEqualSingle extends Single implements FuseToObservable {
final ObservableSource first;
final ObservableSource second;
final BiPredicate comparer;
final int bufferSize;
public ObservableSequenceEqualSingle(ObservableSource first, ObservableSource second,
BiPredicate comparer, int bufferSize) {
this.first = first;
this.second = second;
this.comparer = comparer;
this.bufferSize = bufferSize;
}
@Override
public void subscribeActual(SingleObserver observer) {
EqualCoordinator ec = new EqualCoordinator<>(observer, bufferSize, first, second, comparer);
observer.onSubscribe(ec);
ec.subscribe();
}
@Override
public Observable fuseToObservable() {
return RxJavaPlugins.onAssembly(new ObservableSequenceEqual<>(first, second, comparer, bufferSize));
}
static final class EqualCoordinator extends AtomicInteger implements Disposable {
private static final long serialVersionUID = -6178010334400373240L;
final SingleObserver downstream;
final BiPredicate comparer;
final ArrayCompositeDisposable resources;
final ObservableSource first;
final ObservableSource second;
final EqualObserver[] observers;
volatile boolean cancelled;
T v1;
T v2;
EqualCoordinator(SingleObserver actual, int bufferSize,
ObservableSource first, ObservableSource second,
BiPredicate comparer) {
this.downstream = actual;
this.first = first;
this.second = second;
this.comparer = comparer;
@SuppressWarnings("unchecked")
EqualObserver[] as = new EqualObserver[2];
this.observers = as;
as[0] = new EqualObserver<>(this, 0, bufferSize);
as[1] = new EqualObserver<>(this, 1, bufferSize);
this.resources = new ArrayCompositeDisposable(2);
}
boolean setDisposable(Disposable d, int index) {
return resources.setResource(index, d);
}
void subscribe() {
EqualObserver[] as = observers;
first.subscribe(as[0]);
second.subscribe(as[1]);
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
resources.dispose();
if (getAndIncrement() == 0) {
EqualObserver[] as = observers;
as[0].queue.clear();
as[1].queue.clear();
}
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
void cancel(SpscLinkedArrayQueue q1, SpscLinkedArrayQueue q2) {
cancelled = true;
q1.clear();
q2.clear();
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
EqualObserver[] as = observers;
final EqualObserver observer1 = as[0];
final SpscLinkedArrayQueue q1 = observer1.queue;
final EqualObserver observer2 = as[1];
final SpscLinkedArrayQueue q2 = observer2.queue;
for (;;) {
for (;;) {
if (cancelled) {
q1.clear();
q2.clear();
return;
}
boolean d1 = observer1.done;
if (d1) {
Throwable e = observer1.error;
if (e != null) {
cancel(q1, q2);
downstream.onError(e);
return;
}
}
boolean d2 = observer2.done;
if (d2) {
Throwable e = observer2.error;
if (e != null) {
cancel(q1, q2);
downstream.onError(e);
return;
}
}
if (v1 == null) {
v1 = q1.poll();
}
boolean e1 = v1 == null;
if (v2 == null) {
v2 = q2.poll();
}
boolean e2 = v2 == null;
if (d1 && d2 && e1 && e2) {
downstream.onSuccess(true);
return;
}
if ((d1 && d2) && (e1 != e2)) {
cancel(q1, q2);
downstream.onSuccess(false);
return;
}
if (!e1 && !e2) {
boolean c;
try {
c = comparer.test(v1, v2);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancel(q1, q2);
downstream.onError(ex);
return;
}
if (!c) {
cancel(q1, q2);
downstream.onSuccess(false);
return;
}
v1 = null;
v2 = null;
}
if (e1 || e2) {
break;
}
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
}
static final class EqualObserver implements Observer {
final EqualCoordinator parent;
final SpscLinkedArrayQueue queue;
final int index;
volatile boolean done;
Throwable error;
EqualObserver(EqualCoordinator parent, int index, int bufferSize) {
this.parent = parent;
this.index = index;
this.queue = new SpscLinkedArrayQueue<>(bufferSize);
}
@Override
public void onSubscribe(Disposable d) {
parent.setDisposable(d, index);
}
@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();
}
}
}
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