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Diffstat (limited to 'bean/com/sun/star/comp/beans/CallWatchThread.java')
-rw-r--r-- | bean/com/sun/star/comp/beans/CallWatchThread.java | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/bean/com/sun/star/comp/beans/CallWatchThread.java b/bean/com/sun/star/comp/beans/CallWatchThread.java new file mode 100644 index 000000000000..1ab89337c74e --- /dev/null +++ b/bean/com/sun/star/comp/beans/CallWatchThread.java @@ -0,0 +1,128 @@ +/************************************************************************* + * + * 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 ); + } +} + + + + |