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.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
/**
* {@link GenericFutureListener} implementation which takes other {@link Future}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;
/**
* Create a new instance.
*
* @param promises the {@link Promise}s to notify once this {@link GenericFutureListener} is notified.
*/
@SafeVarargs
public PromiseNotifier(Promise... promises) {
checkNotNull(promises, "promises");
for (Promise promise: promises) {
if (promise == null) {
throw new IllegalArgumentException("promises contains null Promise");
}
}
this.promises = promises.clone();
}
@Override
public void operationComplete(F future) throws Exception {
if (future.isSuccess()) {
V result = future.get();
for (Promise p: promises) {
if (!p.trySuccess(result)) {
logger.warn("Failed to mark a promise as success because it is done already: {}", p);
}
}
} else if (future.isCancelled()) {
for (Promise p: promises) {
if (!p.cancel(false)) {
logger.warn("Failed to cancel a promise because it is done already: {}", p);
}
}
} else {
Throwable cause = future.cause();
for (Promise p: promises) {
if (!p.tryFailure(cause)) {
logger.warn("Failed to mark a promise as failure because it's done already: {}", p, cause);
}
}
}
}
}