119 lines
3.7 KiB
Java
119 lines
3.7 KiB
Java
/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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package com.sun.star.comp.beans;
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/** Helper class to watch calls into OOo with a timeout.
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*/
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// Do not add the thread instances to a threadgroup. When testing the bean in
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// an applet it turned out the ThreadGroup was in an inconsistent state
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// after navigating off the site that contains the applet and back to it.
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// That was tested with a Sun JRE 1.4.2_06
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public class CallWatchThread extends Thread
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{
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private static boolean DEBUG = false;
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private Thread aWatchedThread;
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private String aTag;
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private boolean bAlive;
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private long nTimeout;
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public CallWatchThread(long nTimeout)
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{
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this(nTimeout, "CallWatchThread");
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}
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public CallWatchThread( long nTimeout, String aTag )
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{
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super(aTag);
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this.aWatchedThread = Thread.currentThread();
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this.nTimeout = nTimeout;
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this.aTag = aTag;
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setDaemon( true );
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dbgPrint( "CallWatchThread(" + this + ").start(" + aTag + ")" );
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start();
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}
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public void cancel()
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throws InterruptedException
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{
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dbgPrint( "CallWatchThread(" + this + ".cancel(" + aTag + ")" );
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if ( aWatchedThread != null && aWatchedThread != Thread.currentThread() )
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throw new RuntimeException( "wrong thread" );
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aWatchedThread = null;
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if ( interrupted() )
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throw new InterruptedException();
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}
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public synchronized void restart()
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throws InterruptedException
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{
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dbgPrint( "CallWatchThread(" + this + ".restart(" + aTag + ")" );
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if ( aWatchedThread != null && aWatchedThread != Thread.currentThread() )
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throw new RuntimeException( "wrong thread" );
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bAlive = true;
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if ( interrupted() )
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throw new InterruptedException();
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notify();
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}
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@Override
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public void run()
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{
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dbgPrint( "CallWatchThread(" + this + ".run(" + aTag + ") ***** STARTED *****" );
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long n = 0;
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while ( aWatchedThread != null )
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{
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dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") running #" + ++n );
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synchronized(this)
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{
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bAlive = false;
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try
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{
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wait( nTimeout );
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}
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catch ( InterruptedException aExc )
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{
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bAlive = false;
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}
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// watched thread seems to be dead (not answering)?
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if ( !bAlive && aWatchedThread != null )
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{
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dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") interrupting" );
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aWatchedThread.interrupt();
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aWatchedThread = null;
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}
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}
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}
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dbgPrint( "CallWatchThread(" + this + ").run(" + aTag + ") terminated" );
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}
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private void dbgPrint( String aMessage )
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{
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if (DEBUG)
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System.err.println( "OOoBean: " + aMessage );
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}
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}
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