1*1b0aaa91SAndrew Rist /************************************************************** 2*1b0aaa91SAndrew Rist * 3*1b0aaa91SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 4*1b0aaa91SAndrew Rist * or more contributor license agreements. See the NOTICE file 5*1b0aaa91SAndrew Rist * distributed with this work for additional information 6*1b0aaa91SAndrew Rist * regarding copyright ownership. The ASF licenses this file 7*1b0aaa91SAndrew Rist * to you under the Apache License, Version 2.0 (the 8*1b0aaa91SAndrew Rist * "License"); you may not use this file except in compliance 9*1b0aaa91SAndrew Rist * with the License. You may obtain a copy of the License at 10*1b0aaa91SAndrew Rist * 11*1b0aaa91SAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0 12*1b0aaa91SAndrew Rist * 13*1b0aaa91SAndrew Rist * Unless required by applicable law or agreed to in writing, 14*1b0aaa91SAndrew Rist * software distributed under the License is distributed on an 15*1b0aaa91SAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*1b0aaa91SAndrew Rist * KIND, either express or implied. See the License for the 17*1b0aaa91SAndrew Rist * specific language governing permissions and limitations 18*1b0aaa91SAndrew Rist * under the License. 19*1b0aaa91SAndrew Rist * 20*1b0aaa91SAndrew Rist *************************************************************/ 21*1b0aaa91SAndrew Rist 22cdf0e10cSrcweir import com.sun.star.accessibility.*; 23cdf0e10cSrcweir import com.sun.star.lang.EventObject; 24cdf0e10cSrcweir 25cdf0e10cSrcweir import java.util.LinkedList; 26cdf0e10cSrcweir 27cdf0e10cSrcweir /** The event queue singleton dispatches events received from OpenOffice.org 28cdf0e10cSrcweir applications in a thread separate from the AWB main thread. 29cdf0e10cSrcweir 30cdf0e10cSrcweir The queue of event objects, LinkedList<Runnable> The queue object will 31cdf0e10cSrcweir also serve as lock for the consumer/producer type syncronization. 32cdf0e10cSrcweir */ 33cdf0e10cSrcweir class EventQueue 34cdf0e10cSrcweir implements Runnable 35cdf0e10cSrcweir { 36cdf0e10cSrcweir public boolean mbVerbose = false; 37cdf0e10cSrcweir public boolean mbHandleDisposingEventsSynchronous = true; 38cdf0e10cSrcweir 39cdf0e10cSrcweir public synchronized static EventQueue Instance () 40cdf0e10cSrcweir { 41cdf0e10cSrcweir if (maInstance == null) 42cdf0e10cSrcweir maInstance = new EventQueue (); 43cdf0e10cSrcweir return maInstance; 44cdf0e10cSrcweir } 45cdf0e10cSrcweir 46cdf0e10cSrcweir public void addEvent (Runnable aEvent) 47cdf0e10cSrcweir { 48cdf0e10cSrcweir synchronized (maMonitor) 49cdf0e10cSrcweir { 50cdf0e10cSrcweir if (mbVerbose) 51cdf0e10cSrcweir System.out.println ("queing regular event " + aEvent); 52cdf0e10cSrcweir maRegularQueue.addLast (aEvent); 53cdf0e10cSrcweir maMonitor.notify (); 54cdf0e10cSrcweir } 55cdf0e10cSrcweir } 56cdf0e10cSrcweir 57cdf0e10cSrcweir 58cdf0e10cSrcweir public void addDisposingEvent (Runnable aEvent) 59cdf0e10cSrcweir { 60cdf0e10cSrcweir if (mbHandleDisposingEventsSynchronous) 61cdf0e10cSrcweir aEvent.run (); 62cdf0e10cSrcweir else 63cdf0e10cSrcweir synchronized (maMonitor) 64cdf0e10cSrcweir { 65cdf0e10cSrcweir if (mbVerbose) 66cdf0e10cSrcweir System.out.println ("queing disposing event " + aEvent); 67cdf0e10cSrcweir maDisposingQueue.addLast (aEvent); 68cdf0e10cSrcweir maMonitor.notify (); 69cdf0e10cSrcweir } 70cdf0e10cSrcweir } 71cdf0e10cSrcweir 72cdf0e10cSrcweir 73cdf0e10cSrcweir private EventQueue () 74cdf0e10cSrcweir { 75cdf0e10cSrcweir maMonitor = new Boolean (true); 76cdf0e10cSrcweir maRegularQueue = new LinkedList(); 77cdf0e10cSrcweir maDisposingQueue = new LinkedList(); 78cdf0e10cSrcweir new Thread(this, "AWB.EventQueue").start(); 79cdf0e10cSrcweir } 80cdf0e10cSrcweir 81cdf0e10cSrcweir 82cdf0e10cSrcweir /// This thread's main method: deliver all events 83cdf0e10cSrcweir public void run() 84cdf0e10cSrcweir { 85cdf0e10cSrcweir // in an infinite loop, check for events to deliver, then 86cdf0e10cSrcweir // wait on lock (which will be notified when new events arrive) 87cdf0e10cSrcweir while( true ) 88cdf0e10cSrcweir { 89cdf0e10cSrcweir Runnable aEvent = null; 90cdf0e10cSrcweir do 91cdf0e10cSrcweir { 92cdf0e10cSrcweir synchronized (maMonitor) 93cdf0e10cSrcweir { 94cdf0e10cSrcweir if (maDisposingQueue.size() > 0) 95cdf0e10cSrcweir { 96cdf0e10cSrcweir aEvent = (Runnable)maDisposingQueue.removeFirst(); 97cdf0e10cSrcweir if (mbVerbose) 98cdf0e10cSrcweir System.out.println ("delivering disposing event " + aEvent); 99cdf0e10cSrcweir } 100cdf0e10cSrcweir else if (maRegularQueue.size() > 0) 101cdf0e10cSrcweir { 102cdf0e10cSrcweir aEvent = (Runnable)maRegularQueue.removeFirst(); 103cdf0e10cSrcweir if (mbVerbose) 104cdf0e10cSrcweir System.out.println ("delivering regular event " + aEvent); 105cdf0e10cSrcweir } 106cdf0e10cSrcweir else 107cdf0e10cSrcweir aEvent = null; 108cdf0e10cSrcweir } 109cdf0e10cSrcweir if (aEvent != null) 110cdf0e10cSrcweir { 111cdf0e10cSrcweir try 112cdf0e10cSrcweir { 113cdf0e10cSrcweir aEvent.run(); 114cdf0e10cSrcweir } 115cdf0e10cSrcweir catch( Throwable e ) 116cdf0e10cSrcweir { 117cdf0e10cSrcweir System.out.println( 118cdf0e10cSrcweir "caught exception during event delivery: " + e ); 119cdf0e10cSrcweir e.printStackTrace(); 120cdf0e10cSrcweir } 121cdf0e10cSrcweir } 122cdf0e10cSrcweir } 123cdf0e10cSrcweir while( aEvent != null ); 124cdf0e10cSrcweir 125cdf0e10cSrcweir try 126cdf0e10cSrcweir { 127cdf0e10cSrcweir synchronized (maMonitor) 128cdf0e10cSrcweir { 129cdf0e10cSrcweir maMonitor.wait(); 130cdf0e10cSrcweir } 131cdf0e10cSrcweir } 132cdf0e10cSrcweir catch (Exception e) 133cdf0e10cSrcweir { 134cdf0e10cSrcweir // can't wait? odd! 135cdf0e10cSrcweir System.err.println("Can't wait!"); 136cdf0e10cSrcweir e.printStackTrace(); 137cdf0e10cSrcweir } 138cdf0e10cSrcweir } 139cdf0e10cSrcweir } 140cdf0e10cSrcweir 141cdf0e10cSrcweir private static EventQueue maInstance = null; 142cdf0e10cSrcweir private Object maMonitor; 143cdf0e10cSrcweir private LinkedList maRegularQueue; 144cdf0e10cSrcweir private LinkedList maDisposingQueue; 145cdf0e10cSrcweir } 146cdf0e10cSrcweir 147cdf0e10cSrcweir 148