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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
package com.sun.star.comp.beans;
//---------------------------------------------------------------------------
/** Helper class to watch calls into OOo with a timeout.
*/
//Do not add the thread instances to a threadgroup. When testing the bean in
//an applet it turned out the the ThreadGroup was in an inconsistent state
//after navigating off the site that contains the applet and back to it.
//That was tested with a Sun JRE 1.4.2_06
public class CallWatchThread extends Thread
{
private static boolean DEBUG = false;
private Thread aWatchedThread;
private String aTag;
private boolean bAlive;
private long nTimeout;
public CallWatchThread(long nTimeout)
{
this(nTimeout, "");
}
public CallWatchThread( long nTimeout, String aTag )
{
super(aTag);
this.aWatchedThread = Thread.currentThread();
this.nTimeout = nTimeout;
this.aTag = aTag;
setDaemon( true );
dbgPrint( "CallWatchThread(" + this + ").start(" + aTag + ")" );
start();
}
public void cancel()
throws java.lang.InterruptedException
{
dbgPrint( "CallWatchThread(" + this + ".cancel(" + aTag + ")" );
if ( aWatchedThread != null && aWatchedThread != Thread.currentThread() )
throw new RuntimeException( "wrong thread" );
aWatchedThread = null;
if ( interrupted() )
throw new InterruptedException();
}
public synchronized void restart()
throws java.lang.InterruptedException
{
dbgPrint( "CallWatchThread(" + this + ".restart(" + aTag + ")" );
if ( aWatchedThread != null && aWatchedThread != Thread.currentThread() )
throw new RuntimeException( "wrong thread" );
bAlive = true;
if ( interrupted() )
throw new InterruptedException();
notify();
}
public void run()
{
dbgPrint( "CallWatchThread(" + this + ".run(" + aTag + ") ***** STARTED *****" );
long n = 0;
while ( aWatchedThread != null )
{
dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") running #" + ++n );
synchronized(this)
{
bAlive = false;
try
{
wait( nTimeout );
}
catch ( java.lang.InterruptedException aExc )
{
bAlive = false;
}
// watched thread seems to be dead (not answering)?
if ( !bAlive && aWatchedThread != null )
{
dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") interrupting" );
aWatchedThread.interrupt();
aWatchedThread = null;
}
}
}
dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") terminated" );
}
private void dbgPrint( String aMessage )
{
if (DEBUG)
System.err.println( "OOoBean: " + aMessage );
}
}
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