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/*
* @(#)TimedProcess.java
*
* Copyright (C) 2001,2003 Matt Albrecht
* groboclown@users.sourceforge.net
* http://groboutils.sourceforge.net
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package net.sourceforge.groboutils.util.thread.v1;
/**
* A Utility to run a task in a thread, and to kill it if the thread runs
* too long. This will first attempt an interrupt() on the thread. If that
* doesn't work, then a stop() will be executed. This is a well-documented
* bad practice, so you have been warned!
*
* @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
* @version $Date: 2003/02/10 22:52:49 $
* @since 15-Mar-2002
*/
public class TimedProcess
{
protected static TimedProcess s_instance = new TimedProcess();
public static final int REASONABLE_TIME = 500;
/**
* Implement this interface to have your own method for killing the
* runner and thread. The caller will perform the Thread.join() manually.
* If the thread is still running after every possible attempt to stop
* the thread has occured (run this interface, and join), then a stop()
* will be called on the thread.
*/
public static interface RunnableKiller
{
public void killRunnable( Runnable r, Thread t );
}
private static class InterruptRunnableKiller implements RunnableKiller
{
public void killRunnable( Runnable r, Thread t )
{
t.interrupt();
}
}
private RunnableKiller interruptor = new InterruptRunnableKiller();
protected TimedProcess()
{
// do nothing
}
public static TimedProcess getInstance()
{
return s_instance;
}
/**
* Runs the given process in a Thread. If it does not stop within the
* specified time, then attempts will be made to kill the thread
* (see earlier text). If the process did not complete in the specified
* time, an <tt>InterruptedException</tt> will be thrown.
*
* @exception InterruptedException if the process did not complete within
* the given time frame.
*/
public void runTimed( Runnable process, long waitTimeMillis )
throws InterruptedException
{
runTimed( process, waitTimeMillis, this.interruptor );
}
/**
* Runs the given process in a Thread. If it does not stop within the
* specified time, then attempts will be made to kill the thread
* (see earlier text). If the process did not complete in the specified
* time, an <tt>InterruptedException</tt> will be thrown.
*
* @exception InterruptedException if the process did not complete within
* the given time frame.
*/
public void runTimed( Runnable process, long waitTimeMillis,
RunnableKiller processEnder )
throws InterruptedException
{
if (processEnder == null || process == null ||
waitTimeMillis <= 0L)
{
throw new IllegalArgumentException("no null args");
}
Thread t = new Thread( process, "TimedProcess" );
setupThread( t );
t.start();
joinThread( t, waitTimeMillis );
if (t.isAlive())
{
stopThread( t, process, processEnder );
throw new InterruptedException( "Process did not end within "+
waitTimeMillis+" milliseconds." );
}
}
/**
*
*/
protected void setupThread( Thread t )
{
// do nothing
}
/**
*
*/
protected void stopThread( Thread t, Runnable process,
RunnableKiller processEnder )
{
processEnder.killRunnable( process, t );
joinThread( t, REASONABLE_TIME );
if (t.isAlive())
{
// We'll give it one more shot before we really kill it.
t.interrupt();
joinThread( t, REASONABLE_TIME );
if (t.isAlive())
{
// ok, that's enough.
// Let's do this the hard way.
t.stop(); // we know this is bad, but do it anyway
if (t.isAlive())
{
throw new IllegalStateException(
"After stopping the thread, the thread still lives. "+
"The thread cannot be killed." );
}
}
}
}
protected void joinThread( Thread t, long joinTime )
{
try
{
t.join( joinTime );
}
catch (InterruptedException e)
{
// ignore
}
}
}
|
