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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.observers;
import java.util.concurrent.atomic.AtomicInteger;
import io.reactivex.rxjava3.core.Observer;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.operators.SimplePlainQueue;
/**
* Abstract base class for subscribers that hold another subscriber, a queue
* and requires queue-drain behavior.
*
* @param the source type to which this subscriber will be subscribed
* @param the value type in the queue
* @param the value type the child subscriber accepts
*/
public abstract class QueueDrainObserver extends QueueDrainSubscriberPad2 implements Observer, ObservableQueueDrain {
protected final Observer super V> downstream;
protected final SimplePlainQueue queue;
protected volatile boolean cancelled;
protected volatile boolean done;
protected Throwable error;
public QueueDrainObserver(Observer super V> actual, SimplePlainQueue queue) {
this.downstream = actual;
this.queue = queue;
}
@Override
public final boolean cancelled() {
return cancelled;
}
@Override
public final boolean done() {
return done;
}
@Override
public final boolean enter() {
return wip.getAndIncrement() == 0;
}
protected final void fastPathEmit(U value, boolean delayError, Disposable dispose) {
final Observer super V> observer = downstream;
final SimplePlainQueue q = queue;
if (wip.get() == 0 && wip.compareAndSet(0, 1)) {
accept(observer, value);
if (leave(-1) == 0) {
return;
}
} else {
q.offer(value);
if (!enter()) {
return;
}
}
QueueDrainHelper.drainLoop(q, observer, delayError, dispose, this);
}
/**
* Makes sure the fast-path emits in order.
* @param value the value to emit or queue up
* @param delayError if true, errors are delayed until the source has terminated
* @param disposable the resource to dispose if the drain terminates
*/
protected final void fastPathOrderedEmit(U value, boolean delayError, Disposable disposable) {
final Observer super V> observer = downstream;
final SimplePlainQueue q = queue;
if (wip.get() == 0 && wip.compareAndSet(0, 1)) {
if (q.isEmpty()) {
accept(observer, value);
if (leave(-1) == 0) {
return;
}
} else {
q.offer(value);
}
} else {
q.offer(value);
if (!enter()) {
return;
}
}
QueueDrainHelper.drainLoop(q, observer, delayError, disposable, this);
}
@Override
public final Throwable error() {
return error;
}
@Override
public final int leave(int m) {
return wip.addAndGet(m);
}
@Override
public void accept(Observer super V> a, U v) {
// ignored by default
}
}
// -------------------------------------------------------------------
// Padding superclasses
//-------------------------------------------------------------------
/** Pads the header away from other fields. */
class QueueDrainSubscriberPad0 {
volatile long p1, p2, p3, p4, p5, p6, p7;
volatile long p8, p9, p10, p11, p12, p13, p14, p15;
}
/** The wip counter. */
class QueueDrainSubscriberWip extends QueueDrainSubscriberPad0 {
final AtomicInteger wip = new AtomicInteger();
}
/** Pads away the wip from the other fields. */
class QueueDrainSubscriberPad2 extends QueueDrainSubscriberWip {
volatile long p1a, p2a, p3a, p4a, p5a, p6a, p7a;
volatile long p8a, p9a, p10a, p11a, p12a, p13a, p14a, p15a;
}
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