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