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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 .
*/
import java.util.LinkedList;
/** The event queue singleton dispatches events received from OpenOffice.org
applications in a thread separate from the AWB main thread.
The queue of event objects, LinkedList<Runnable> The queue object will
also serve as lock for the consumer/producer type synchronization.
*/
class EventQueue
implements Runnable
{
public boolean mbVerbose = false;
public boolean mbHandleDisposingEventsSynchronous = true;
public synchronized static EventQueue Instance ()
{
if (maInstance == null)
maInstance = new EventQueue ();
return maInstance;
}
public void addEvent (Runnable aEvent)
{
synchronized (maMonitor)
{
if (mbVerbose)
System.out.println ("queing regular event " + aEvent);
maRegularQueue.addLast (aEvent);
maMonitor.notify ();
}
}
public void addDisposingEvent (Runnable aEvent)
{
if (mbHandleDisposingEventsSynchronous)
aEvent.run ();
else
synchronized (maMonitor)
{
if (mbVerbose)
System.out.println ("queing disposing event " + aEvent);
maDisposingQueue.addLast (aEvent);
maMonitor.notify ();
}
}
private EventQueue ()
{
maMonitor = new Boolean (true);
maRegularQueue = new LinkedList<Runnable>();
maDisposingQueue = new LinkedList<Runnable>();
new Thread(this, "AWB.EventQueue").start();
}
/// This thread's main method: deliver all events
public void run()
{
// in an infinite loop, check for events to deliver, then
// wait on lock (which will be notified when new events arrive)
while( true )
{
Runnable aEvent = null;
do
{
synchronized (maMonitor)
{
if (maDisposingQueue.size() > 0)
{
aEvent = maDisposingQueue.removeFirst();
if (mbVerbose)
System.out.println ("delivering disposing event " + aEvent);
}
else if (maRegularQueue.size() > 0)
{
aEvent = maRegularQueue.removeFirst();
if (mbVerbose)
System.out.println ("delivering regular event " + aEvent);
}
else
aEvent = null;
}
if (aEvent != null)
{
try
{
aEvent.run();
}
catch( Throwable e )
{
System.out.println(
"caught exception during event delivery: " + e );
e.printStackTrace();
}
}
}
while( aEvent != null );
try
{
synchronized (maMonitor)
{
maMonitor.wait();
}
}
catch (Exception e)
{
// can't wait? odd!
System.err.println("Can't wait!");
e.printStackTrace();
}
}
}
private static EventQueue maInstance = null;
private Object maMonitor;
private LinkedList<Runnable> maRegularQueue;
private LinkedList<Runnable> maDisposingQueue;
}
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