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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 2014 The Netty Project
*
* The Netty Project licenses this file to you 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:
*
* https://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.netty.util.concurrent;
import io.netty.util.internal.PromiseNotificationUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.ObjectUtil.checkNotNullWithIAE;
/**
* {@link GenericFutureListener} implementation which takes other {@link Promise}s
* and notifies them on completion.
*
* @param the type of value returned by the future
* @param the type of future
*/
public class PromiseNotifier> implements GenericFutureListener {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(PromiseNotifier.class);
private final Promise super V>[] promises;
private final boolean logNotifyFailure;
/**
* Create a new instance.
*
* @param promises the {@link Promise}s to notify once this {@link GenericFutureListener} is notified.
*/
@SafeVarargs
public PromiseNotifier(Promise super V>... promises) {
this(true, promises);
}
/**
* Create a new instance.
*
* @param logNotifyFailure {@code true} if logging should be done in case notification fails.
* @param promises the {@link Promise}s to notify once this {@link GenericFutureListener} is notified.
*/
@SafeVarargs
public PromiseNotifier(boolean logNotifyFailure, Promise super V>... promises) {
checkNotNull(promises, "promises");
for (Promise super V> promise: promises) {
checkNotNullWithIAE(promise, "promise");
}
this.promises = promises.clone();
this.logNotifyFailure = logNotifyFailure;
}
/**
* Link the {@link Future} and {@link Promise} such that if the {@link Future} completes the {@link Promise}
* will be notified. Cancellation is propagated both ways such that if the {@link Future} is cancelled
* the {@link Promise} is cancelled and vise-versa.
*
* @param future the {@link Future} which will be used to listen to for notifying the {@link Promise}.
* @param promise the {@link Promise} which will be notified
* @param the type of the value.
* @param the type of the {@link Future}
* @return the passed in {@link Future}
*/
public static > F cascade(final F future, final Promise super V> promise) {
return cascade(true, future, promise);
}
/**
* Link the {@link Future} and {@link Promise} such that if the {@link Future} completes the {@link Promise}
* will be notified. Cancellation is propagated both ways such that if the {@link Future} is cancelled
* the {@link Promise} is cancelled and vise-versa.
*
* @param logNotifyFailure {@code true} if logging should be done in case notification fails.
* @param future the {@link Future} which will be used to listen to for notifying the {@link Promise}.
* @param promise the {@link Promise} which will be notified
* @param the type of the value.
* @param the type of the {@link Future}
* @return the passed in {@link Future}
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public static > F cascade(boolean logNotifyFailure, final F future,
final Promise super V> promise) {
promise.addListener(new FutureListener() {
@Override
public void operationComplete(Future f) {
if (f.isCancelled()) {
future.cancel(false);
}
}
});
future.addListener(new PromiseNotifier(logNotifyFailure, promise) {
@Override
public void operationComplete(Future f) throws Exception {
if (promise.isCancelled() && f.isCancelled()) {
// Just return if we propagate a cancel from the promise to the future and both are notified already
return;
}
super.operationComplete(future);
}
});
return future;
}
@Override
public void operationComplete(F future) throws Exception {
InternalLogger internalLogger = logNotifyFailure ? logger : null;
if (future.isSuccess()) {
V result = future.get();
for (Promise super V> p: promises) {
PromiseNotificationUtil.trySuccess(p, result, internalLogger);
}
} else if (future.isCancelled()) {
for (Promise super V> p: promises) {
PromiseNotificationUtil.tryCancel(p, internalLogger);
}
} else {
Throwable cause = future.cause();
for (Promise super V> p: promises) {
PromiseNotificationUtil.tryFailure(p, cause, internalLogger);
}
}
}
}
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