io.netty.util.concurrent.PromiseNotifier Maven / Gradle / Ivy
/*
* 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:
*
* 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.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;
/**
* {@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[] 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... 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... promises) {
checkNotNull(promises, "promises");
for (Promise promise: promises) {
if (promise == null) {
throw new IllegalArgumentException("promises contains null Promise");
}
}
this.promises = promises.clone();
this.logNotifyFailure = logNotifyFailure;
}
@Override
public void operationComplete(F future) throws Exception {
InternalLogger internalLogger = logNotifyFailure ? logger : null;
if (future.isSuccess()) {
V result = future.get();
for (Promise p: promises) {
PromiseNotificationUtil.trySuccess(p, result, internalLogger);
}
} else if (future.isCancelled()) {
for (Promise p: promises) {
PromiseNotificationUtil.tryCancel(p, internalLogger);
}
} else {
Throwable cause = future.cause();
for (Promise p: promises) {
PromiseNotificationUtil.tryFailure(p, cause, internalLogger);
}
}
}
}