/*
* 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 <V> the type of value returned by the future
* @param <F> the type of future
*/
public class
PromiseNotifier<V, F extends
Future<V>> implements
GenericFutureListener<F> {
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) {
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<? 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);
}
}
}
}