Source Code Cross Referenced for NativeEventQueue.java in  » Apache-Harmony-Java-SE » org-package » org » apache » harmony » awt » wtk » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » org package » org.apache.harmony.awt.wtk 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:        /**
018:         * @author Mikhail Danilov
019:         * @version $Revision$
020:         */package org.apache.harmony.awt.wtk;
021:
022:        import java.util.LinkedList;
023:
024:        /**
025:         * Describes the cross-platform native event queue interface
026:         *
027:         * <p/> The implementation constructor should remember thread it was
028:         * created. All other methods would be called obly from this thread,
029:         * except awake().
030:         */
031:        public abstract class NativeEventQueue {
032:
033:            private ShutdownWatchdog shutdownWatchdog;
034:
035:            private class EventMonitor {
036:            }
037:
038:            private final Object eventMonitor = new EventMonitor();
039:            private final LinkedList<NativeEvent> eventQueue = new LinkedList<NativeEvent>();
040:
041:            public static abstract class Task {
042:                public volatile Object returnValue;
043:
044:                public abstract void perform();
045:            }
046:
047:            /**
048:             * Blocks current thread until native event queue is not empty
049:             * or awaken from other thread by awake().
050:             *
051:             * <p/>Should be called only on tread which
052:             * will process native events.
053:             *
054:             * @return if event loop should be stopped
055:             */
056:            public abstract boolean waitEvent();
057:
058:            /**
059:             * Determines whether or not the native event queue is empty.
060:             * An queue is empty if it contains no messages waiting.
061:             *
062:             * @return true if the queue is empty; false otherwise
063:             */
064:            public boolean isEmpty() {
065:                synchronized (eventQueue) {
066:                    return eventQueue.isEmpty();
067:                }
068:            }
069:
070:            public NativeEvent getNextEvent() {
071:                synchronized (eventQueue) {
072:                    if (eventQueue.isEmpty()) {
073:                        shutdownWatchdog.setNativeQueueEmpty(true);
074:                        return null;
075:                    }
076:                    return eventQueue.remove(0);
077:                }
078:            }
079:
080:            protected void addEvent(NativeEvent event) {
081:                synchronized (eventQueue) {
082:                    eventQueue.add(event);
083:                    shutdownWatchdog.setNativeQueueEmpty(false);
084:                }
085:                synchronized (eventMonitor) {
086:                    eventMonitor.notify();
087:                }
088:            }
089:
090:            public final Object getEventMonitor() {
091:                return eventMonitor;
092:            }
093:
094:            public abstract void awake();
095:
096:            /**
097:             * Gets AWT system window ID.
098:             *
099:             * @return AWT system window ID
100:             */
101:            public abstract long getJavaWindow();
102:
103:            /**
104:             * Add NativeEvent to the queue
105:             */
106:            public abstract void dispatchEvent();
107:
108:            public abstract void performTask(Task task);
109:
110:            public abstract void performLater(Task task);
111:
112:            public final void setShutdownWatchdog(ShutdownWatchdog watchdog) {
113:                synchronized (eventQueue) {
114:                    shutdownWatchdog = watchdog;
115:                }
116:            }
117:
118:        }
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