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/**
* Copyright (c) 2004 - 2009 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.om.monitor;
import org.eclipse.net4j.util.concurrent.TimeoutRuntimeException;
import java.util.TimerTask;
/**
* @author Eike Stepper
* @since 2.0
*/
public class TimeoutMonitor extends Monitor
{
private long timeout;
private long touched;
private TimerTask timeoutTask;
public TimeoutMonitor(long timeout)
{
this.timeout = timeout;
touched = System.currentTimeMillis();
}
public long getTimeout()
{
return timeout;
}
public void setTimeout(long timeout)
{
this.timeout = timeout;
}
public void touch()
{
touched = System.currentTimeMillis();
}
@Override
public OMMonitor begin(double totalWork)
{
touch();
super.begin(totalWork);
scheduleTimeout();
return this;
}
@Override
public void worked(double work)
{
touch();
super.worked(work);
}
@Override
public OMMonitor fork(double work)
{
touch();
return super.fork(work);
}
@Override
public Async forkAsync(double work)
{
touch();
return super.forkAsync(work);
}
@Override
public void cancel(RuntimeException cancelException)
{
if (timeoutTask != null)
{
timeoutTask.cancel();
timeoutTask = null;
}
super.cancel(cancelException);
}
@Override
public boolean isCanceled()
{
touch();
return super.isCanceled();
}
@Override
public void checkCanceled() throws MonitorCanceledException
{
touch();
super.checkCanceled();
}
protected void handleTimeout(long untouched)
{
cancel(new TimeoutRuntimeException("Timeout after " + untouched + " millis"));
}
private void scheduleTimeout()
{
timeoutTask = new TimerTask()
{
@Override
public void run()
{
if (!isCanceled())
{
long untouched = System.currentTimeMillis() - touched;
if (untouched > timeout)
{
timeoutTask = null;
handleTimeout(untouched);
}
else
{
scheduleTimeout();
}
}
}
};
long delay = timeout - (System.currentTimeMillis() - touched);
getTimer().schedule(timeoutTask, delay);
}
}
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