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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.util;
import java.util.concurrent.atomic.AtomicInteger;
import org.reactivestreams.Subscriber;
import io.reactivex.rxjava3.core.Observer;
/**
* Utility methods to perform half-serialization: a form of serialization
* where onNext is guaranteed to be called from a single thread but
* onError or onComplete may be called from any threads.
*/
public final class HalfSerializer {
/** Utility class. */
private HalfSerializer() {
throw new IllegalStateException("No instances!");
}
/**
* Emits the given value if possible and terminates if there was an onComplete or onError
* while emitting, drops the value otherwise.
* @param the value type
* @param subscriber the target Subscriber to emit to
* @param value the value to emit
* @param wip the serialization work-in-progress counter/indicator
* @param errors the holder of Throwables
* @return true if the operation succeeded, false if there sequence completed
*/
public static boolean onNext(Subscriber super T> subscriber, T value,
AtomicInteger wip, AtomicThrowable errors) {
if (wip.get() == 0 && wip.compareAndSet(0, 1)) {
subscriber.onNext(value);
if (wip.decrementAndGet() == 0) {
return true;
}
errors.tryTerminateConsumer(subscriber);
}
return false;
}
/**
* Emits the given exception if possible or adds it to the given error container to
* be emitted by a concurrent onNext if one is running.
* Undeliverable exceptions are sent to the RxJavaPlugins.onError.
* @param subscriber the target Subscriber to emit to
* @param ex the Throwable to emit
* @param wip the serialization work-in-progress counter/indicator
* @param errors the holder of Throwables
*/
public static void onError(Subscriber> subscriber, Throwable ex,
AtomicInteger wip, AtomicThrowable errors) {
if (errors.tryAddThrowableOrReport(ex)) {
if (wip.getAndIncrement() == 0) {
errors.tryTerminateConsumer(subscriber);
}
}
}
/**
* Emits an onComplete signal or an onError signal with the given error or indicates
* the concurrently running onNext should do that.
* @param subscriber the target Subscriber to emit to
* @param wip the serialization work-in-progress counter/indicator
* @param errors the holder of Throwables
*/
public static void onComplete(Subscriber> subscriber, AtomicInteger wip, AtomicThrowable errors) {
if (wip.getAndIncrement() == 0) {
errors.tryTerminateConsumer(subscriber);
}
}
/**
* Emits the given value if possible and terminates if there was an onComplete or onError
* while emitting, drops the value otherwise.
* @param the value type
* @param observer the target Observer to emit to
* @param value the value to emit
* @param wip the serialization work-in-progress counter/indicator
* @param errors the holder of Throwables
*/
public static void onNext(Observer super T> observer, T value,
AtomicInteger wip, AtomicThrowable errors) {
if (wip.get() == 0 && wip.compareAndSet(0, 1)) {
observer.onNext(value);
if (wip.decrementAndGet() != 0) {
errors.tryTerminateConsumer(observer);
}
}
}
/**
* Emits the given exception if possible or adds it to the given error container to
* be emitted by a concurrent onNext if one is running.
* Undeliverable exceptions are sent to the RxJavaPlugins.onError.
* @param observer the target Subscriber to emit to
* @param ex the Throwable to emit
* @param wip the serialization work-in-progress counter/indicator
* @param errors the holder of Throwables
*/
public static void onError(Observer> observer, Throwable ex,
AtomicInteger wip, AtomicThrowable errors) {
if (errors.tryAddThrowableOrReport(ex)) {
if (wip.getAndIncrement() == 0) {
errors.tryTerminateConsumer(observer);
}
}
}
/**
* Emits an onComplete signal or an onError signal with the given error or indicates
* the concurrently running onNext should do that.
* @param observer the target Subscriber to emit to
* @param wip the serialization work-in-progress counter/indicator
* @param errors the holder of Throwables
*/
public static void onComplete(Observer> observer, AtomicInteger wip, AtomicThrowable errors) {
if (wip.getAndIncrement() == 0) {
errors.tryTerminateConsumer(observer);
}
}
}
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