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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.disposables;
import java.util.concurrent.atomic.AtomicReference;
import io.reactivex.rxjava3.annotations.Nullable;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
/**
* A Disposable container that allows atomically updating/replacing the contained
* Disposable with another Disposable, disposing the old one when updating plus
* handling the disposition when the container itself is disposed.
*/
public final class SerialDisposable implements Disposable {
final AtomicReference resource;
/**
* Constructs an empty SerialDisposable.
*/
public SerialDisposable() {
this.resource = new AtomicReference<>();
}
/**
* Constructs a SerialDisposable with the given initial Disposable instance.
* @param initialDisposable the initial Disposable instance to use, null allowed
*/
public SerialDisposable(@Nullable Disposable initialDisposable) {
this.resource = new AtomicReference<>(initialDisposable);
}
/**
* Atomically: set the next disposable on this container and dispose the previous
* one (if any) or dispose next if the container has been disposed.
* @param next the Disposable to set, may be null
* @return true if the operation succeeded, false if the container has been disposed
* @see #replace(Disposable)
*/
public boolean set(@Nullable Disposable next) {
return DisposableHelper.set(resource, next);
}
/**
* Atomically: set the next disposable on this container but don't dispose the previous
* one (if any) or dispose next if the container has been disposed.
* @param next the Disposable to set, may be null
* @return true if the operation succeeded, false if the container has been disposed
* @see #set(Disposable)
*/
public boolean replace(@Nullable Disposable next) {
return DisposableHelper.replace(resource, next);
}
/**
* Returns the currently contained Disposable or null if this container is empty.
* @return the current Disposable, may be null
*/
@Nullable
public Disposable get() {
Disposable d = resource.get();
if (d == DisposableHelper.DISPOSED) {
return Disposable.disposed();
}
return d;
}
@Override
public void dispose() {
DisposableHelper.dispose(resource);
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(resource.get());
}
}
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