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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.subscribers;
import java.util.concurrent.atomic.AtomicReference;
import org.reactivestreams.Subscription;
import io.reactivex.rxjava3.core.FlowableSubscriber;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.QueueDrainHelper;
import io.reactivex.rxjava3.operators.QueueSubscription;
import io.reactivex.rxjava3.operators.SimpleQueue;
/**
* Subscriber that can fuse with the upstream and calls a support interface
* whenever an event is available.
*
* @param the value type
*/
public final class InnerQueuedSubscriber
extends AtomicReference
implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = 22876611072430776L;
final InnerQueuedSubscriberSupport parent;
final int prefetch;
final int limit;
volatile SimpleQueue queue;
volatile boolean done;
long produced;
int fusionMode;
public InnerQueuedSubscriber(InnerQueuedSubscriberSupport parent, int prefetch) {
this.parent = parent;
this.prefetch = prefetch;
this.limit = prefetch - (prefetch >> 2);
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.setOnce(this, s)) {
if (s instanceof QueueSubscription) {
@SuppressWarnings("unchecked")
QueueSubscription qs = (QueueSubscription) s;
int m = qs.requestFusion(QueueSubscription.ANY);
if (m == QueueSubscription.SYNC) {
fusionMode = m;
queue = qs;
done = true;
parent.innerComplete(this);
return;
}
if (m == QueueSubscription.ASYNC) {
fusionMode = m;
queue = qs;
QueueDrainHelper.request(s, prefetch);
return;
}
}
queue = QueueDrainHelper.createQueue(prefetch);
QueueDrainHelper.request(s, prefetch);
}
}
@Override
public void onNext(T t) {
if (fusionMode == QueueSubscription.NONE) {
parent.innerNext(this, t);
} else {
parent.drain();
}
}
@Override
public void onError(Throwable t) {
parent.innerError(this, t);
}
@Override
public void onComplete() {
parent.innerComplete(this);
}
@Override
public void request(long n) {
if (fusionMode != QueueSubscription.SYNC) {
long p = produced + n;
if (p >= limit) {
produced = 0L;
get().request(p);
} else {
produced = p;
}
}
}
@Override
public void cancel() {
SubscriptionHelper.cancel(this);
}
public boolean isDone() {
return done;
}
public void setDone() {
this.done = true;
}
public SimpleQueue queue() {
return queue;
}
}
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