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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.mixed;
import java.util.concurrent.atomic.AtomicInteger;
import org.reactivestreams.Subscription;
import io.reactivex.rxjava3.core.FlowableSubscriber;
import io.reactivex.rxjava3.exceptions.*;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.operators.QueueFuseable;
import io.reactivex.rxjava3.operators.QueueSubscription;
import io.reactivex.rxjava3.operators.SimpleQueue;
import io.reactivex.rxjava3.operators.SpscArrayQueue;
/**
* Base class for implementing concatMapX main subscribers.
*
* @param the upstream value type
* @since 3.0.10
*/
public abstract class ConcatMapXMainSubscriber extends AtomicInteger
implements FlowableSubscriber {
private static final long serialVersionUID = -3214213361171757852L;
final AtomicThrowable errors;
final int prefetch;
final ErrorMode errorMode;
SimpleQueue queue;
Subscription upstream;
volatile boolean done;
volatile boolean cancelled;
boolean syncFused;
public ConcatMapXMainSubscriber(int prefetch, ErrorMode errorMode) {
this.errorMode = errorMode;
this.errors = new AtomicThrowable();
this.prefetch = prefetch;
}
@Override
public final void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(upstream, s)) {
upstream = s;
if (s instanceof QueueSubscription) {
@SuppressWarnings("unchecked")
QueueSubscription qs = (QueueSubscription)s;
int mode = qs.requestFusion(QueueFuseable.ANY | QueueFuseable.BOUNDARY);
if (mode == QueueFuseable.SYNC) {
queue = qs;
syncFused = true;
done = true;
onSubscribeDownstream();
drain();
return;
}
else if (mode == QueueFuseable.ASYNC) {
queue = qs;
onSubscribeDownstream();
upstream.request(prefetch);
return;
}
}
queue = new SpscArrayQueue<>(prefetch);
onSubscribeDownstream();
upstream.request(prefetch);
}
}
@Override
public final void onNext(T t) {
// In async fusion mode, t is a drain indicator
if (t != null) {
if (!queue.offer(t)) {
upstream.cancel();
onError(new QueueOverflowException());
return;
}
}
drain();
}
@Override
public final void onError(Throwable t) {
if (errors.tryAddThrowableOrReport(t)) {
if (errorMode == ErrorMode.IMMEDIATE) {
disposeInner();
}
done = true;
drain();
}
}
@Override
public final void onComplete() {
done = true;
drain();
}
final void stop() {
cancelled = true;
upstream.cancel();
disposeInner();
errors.tryTerminateAndReport();
if (getAndIncrement() == 0) {
queue.clear();
clearValue();
}
}
/**
* Override this to clear values when the downstream disposes.
*/
void clearValue() {
}
/**
* Typically, this should be {@code downstream.onSubscribe(this);}.
*/
abstract void onSubscribeDownstream();
/**
* Typically, this should be {@code inner.dispose()}.
*/
abstract void disposeInner();
/**
* Implement the serialized inner subscribing and value emission here.
*/
abstract void drain();
}
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