/******************************************************************************
* Copyright (c) 2006, 2010 VMware Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html and the Apache License v2.0
* is available at http://www.opensource.org/licenses/apache2.0.php.
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
* VMware Inc.
*****************************************************************************/
package org.eclipse.gemini.blueprint.extender.internal.util.concurrent;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.core.task.TaskExecutor;
import org.springframework.util.Assert;
/**
* Utility class that executes the given Runnable task on the given task executor or , if none is given, to a new
* thread.
*
* <p/> If the thread does not return in the given amount of time, it will be interrupted and a logging message sent.
*
* <p/> This class is intended for usage inside the framework, mainly by the extender package for controlling runaway
* threads.
*
* @see Counter
* @see Thread
* @author Costin Leau
*
*/
public abstract class RunnableTimedExecution {
/** logger */
private static final Log log = LogFactory.getLog(RunnableTimedExecution.class);
private static class MonitoredRunnable implements Runnable {
private Runnable task;
private Counter counter;
public MonitoredRunnable(Runnable task, Counter counter) {
this.task = task;
this.counter = counter;
}
public void run() {
try {
task.run();
} finally {
counter.decrement();
}
}
}
private static class SimpleTaskExecutor implements TaskExecutor, DisposableBean {
private Thread thread;
public void execute(Runnable task) {
thread = new Thread(task);
thread.setName("Thread for runnable [" + task + "]");
thread.start();
}
public void destroy() throws Exception {
if (thread != null) {
thread.interrupt();
}
}
}
public static boolean execute(Runnable task, long waitTime) {
return execute(task, waitTime, null);
}
public static boolean execute(Runnable task, long waitTime, TaskExecutor taskExecutor) {
Assert.notNull(task);
Counter counter = new Counter("counter for task: " + task);
Runnable wrapper = new MonitoredRunnable(task, counter);
boolean internallyManaged = false;
if (taskExecutor == null) {
taskExecutor = new SimpleTaskExecutor();
internallyManaged = true;
}
counter.increment();
taskExecutor.execute(wrapper);
if (counter.waitForZero(waitTime)) {
log.error(task + " did not finish in " + waitTime
+ "ms; consider taking a snapshot and then shutdown the VM in case the thread still hangs");
//log.error("Current Thread dump***\n" + ThreadDump.dumpThreads());
if (internallyManaged) {
try {
((DisposableBean) taskExecutor).destroy();
} catch (Exception e) {
log.error("Exception thrown while destroying internally managed thread executor", e);
}
}
return true;
}
return false;
}
}