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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
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 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, "CallWatchThread");
}
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 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 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();
}
@Override
public void run()
{
dbgPrint( "CallWatchThread(" + this + ".run(" + aTag + ") ***** STARTED *****" );
long n = 0;
synchronized(this)
{
while ( aWatchedThread != null )
{
dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") running #" + ++n );
bAlive = false;
try
{
wait( nTimeout );
}
catch ( 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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