| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| import com.sun.star.accessibility.*; |
| import com.sun.star.lang.EventObject; |
| |
| 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 syncronization. |
| */ |
| 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(); |
| maDisposingQueue = new LinkedList(); |
| 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 = (Runnable)maDisposingQueue.removeFirst(); |
| if (mbVerbose) |
| System.out.println ("delivering disposing event " + aEvent); |
| } |
| else if (maRegularQueue.size() > 0) |
| { |
| aEvent = (Runnable)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 maRegularQueue; |
| private LinkedList maDisposingQueue; |
| } |
| |
| |