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/*
* Copyright (c) 2013 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.concurrent;
import org.eclipse.net4j.internal.util.bundle.OM;
import org.eclipse.net4j.util.om.OMPlatform;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.TimerTask;
import java.util.WeakHashMap;
/**
* @author Eike Stepper
* @since 3.3
*/
public abstract class TrackableTimerTask extends TimerTask
{
/**
* The boolean value of the system property <code>org.eclipse.net4j.util.concurrent.TrackTimerTasks</code>.
*/
public static final boolean TRACK_TIMER_TASKS = Boolean
.parseBoolean(OMPlatform.INSTANCE.getProperty("org.eclipse.net4j.util.concurrent.TrackTimerTasks", "false"));
private static final Map<TrackableTimerTask, ConstructionInfo> CONSTRUCTION_INFOS = TRACK_TIMER_TASKS
? new WeakHashMap<TrackableTimerTask, ConstructionInfo>() : null;
protected TrackableTimerTask()
{
if (TRACK_TIMER_TASKS)
{
synchronized (CONSTRUCTION_INFOS)
{
CONSTRUCTION_INFOS.put(this, new ConstructionInfo());
}
}
}
@Override
public boolean cancel()
{
if (TRACK_TIMER_TASKS)
{
synchronized (CONSTRUCTION_INFOS)
{
CONSTRUCTION_INFOS.remove(this);
}
}
return super.cancel();
}
public static Collection<Exception> getConstructionStackTraces(long minLifeTimeMillis)
{
if (!TRACK_TIMER_TASKS)
{
return Collections.emptyList();
}
long maxTimeStamp = System.currentTimeMillis() - minLifeTimeMillis;
Collection<Exception> result = new ArrayList<Exception>();
synchronized (CONSTRUCTION_INFOS)
{
for (ConstructionInfo constructionInfo : CONSTRUCTION_INFOS.values())
{
if (constructionInfo.timeStamp < maxTimeStamp)
{
result.add(constructionInfo.stackTrace);
}
}
}
return result;
}
public static void logConstructionStackTraces(long minLifeTimeMillis)
{
if (TRACK_TIMER_TASKS)
{
Collection<Exception> constructionStackTraces = getConstructionStackTraces(minLifeTimeMillis);
if (!constructionStackTraces.isEmpty())
{
for (Exception exception : constructionStackTraces)
{
OM.LOG.info(exception);
}
}
}
}
/**
* @author Eike Stepper
*/
private final class ConstructionInfo
{
public final long timeStamp = System.currentTimeMillis();
public final Exception stackTrace = getStackTrace();
private Exception getStackTrace()
{
try
{
throw new Exception("The timer task " + TrackableTimerTask.this + " has been constructed here:");
}
catch (Exception ex)
{
return ex;
}
}
}
}
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