/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat 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 org.jboss.netty.util.internal;
import java.util.concurrent.Executor;
/**
* @author <a href="http://gleamynode.net/">Trustin Lee</a>
* @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
*/
public final class DeadLockProofWorker {
/**
* An <em>internal use only</em> thread-local variable that tells the
* {@link Executor} that this worker acquired a worker thread from.
*/
public static final ThreadLocal<Executor> PARENT = new ThreadLocal<Executor>();
public static void start(final Executor parent, final Runnable runnable) {
if (parent == null) {
throw new NullPointerException("parent");
}
if (runnable == null) {
throw new NullPointerException("runnable");
}
parent.execute(new Runnable() {
public void run() {
PARENT.set(parent);
try {
runnable.run();
} finally {
PARENT.remove();
}
}
});
}
private DeadLockProofWorker() {
super();
}
}