1 files changed, 119 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
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+++ b/bean/com/sun/star/comp/beans/CallWatchThread.java
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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 );
+    }
+}
+
+
+
+