//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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
//
// 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.
// ========================================================================
//
package org.eclipse.jetty.monitor;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import org.eclipse.jetty.util.component.Dumpable;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.StdErrLog;
import org.junit.Test;
/* ------------------------------------------------------------ */
/**
*/
public class ThreadMonitorTest
{
public final static int DURATION=4000;
@Test
public void monitorTest() throws Exception
{
((StdErrLog)Log.getLogger(ThreadMonitor.class.getName())).setHideStacks(true);
((StdErrLog)Log.getLogger(ThreadMonitor.class.getName())).setSource(false);
final AtomicInteger countLogs=new AtomicInteger(0);
final AtomicInteger countSpin=new AtomicInteger(0);
ThreadMonitor monitor = new ThreadMonitor(1000,50,1,1)
{
@Override
protected void logThreadInfo(boolean logAll)
{
if (logAll)
countLogs.incrementAndGet();
else
countSpin.incrementAndGet();
super.logThreadInfo(logAll);
}
};
monitor.setDumpable(new Dumpable()
{
public void dump(Appendable out, String indent) throws IOException
{
out.append(dump());
}
public String dump()
{
return "Dump Spinning";
}
});
monitor.logCpuUsage(2000,0);
monitor.start();
Random rnd = new Random();
for (long cnt=0; cnt<100; cnt++)
{
long value = rnd.nextLong() % 50 + 50;
Sleeper sleeper = new Sleeper(value);
Thread runner = new Thread(sleeper);
runner.setDaemon(true);
runner.start();
}
Spinner spinner = new Spinner();
Thread runner = new Thread(spinner);
runner.start();
Thread.sleep(DURATION);
spinner.setDone();
monitor.stop();
assertTrue(countLogs.get() >= 1);
assertTrue(countSpin.get() >= 2);
}
private class Spinner implements Runnable
{
private volatile boolean done = false;
/* ------------------------------------------------------------ */
public void setDone()
{
done = true;
}
/* ------------------------------------------------------------ */
public void run()
{
spin();
}
/* ------------------------------------------------------------ */
public void spin()
{
long result=-1;
long end=System.currentTimeMillis()+DURATION+1000;
while (!done && System.currentTimeMillis()<end)
{
for (int i=0;i<1000000000;i++)
result^=i;
}
if (result==42)
System.err.println("Bingo!");
}
}
private class Sleeper implements Runnable
{
private long _value;
/* ------------------------------------------------------------ */
public Sleeper(long value)
{
_value = value;
}
/* ------------------------------------------------------------ */
public void run()
{
try
{
fn(_value);
}
catch (InterruptedException e) {}
}
/* ------------------------------------------------------------ */
public long fn(long value) throws InterruptedException
{
long result = value > 1 ? fn(value-1) : 1;
Thread.sleep(50);
return result;
}
}
}