Source Code Cross Referenced for SerialCallback.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.midp.util;
028:
029:        import javax.microedition.lcdui.Display;
030:
031:        /**
032:         * An adaptor class that lets a caller synchronize with the event thread. The
033:         * invokeAndWait() method enqueues an event using Display.callSerially() and
034:         * blocks the caller. When the event reaches the front of the queue, it calls
035:         * this object's run() method on the event thread, and unblocks the caller.
036:         *
037:         * Clients may override the run() method if they wish to provide specialized 
038:         * behavior that must be run on the event thread. If run() is not overridden, 
039:         * invokeAndWait() simply blocks until the event thread has processed the 
040:         * event. This is useful for callers that need to wait until after an event 
041:         * has been processed.
042:         *
043:         * The invokeAndWait() method must not be called on the event thread, 
044:         * otherwise the system will deadlock.
045:         */
046:        public class SerialCallback implements  Runnable {
047:
048:            Display dpy;
049:            Callback callback;
050:            boolean done;
051:
052:            /**
053:             * Constructs this callback object. Requires a Display object upon which 
054:             * the callSerially() method is to be invoked.
055:             */
056:            public SerialCallback(Display dpy) {
057:                this .dpy = dpy;
058:                callback = new Callback();
059:            }
060:
061:            /**
062:             * Blocks the caller until the events currently in the event queue have 
063:             * been processed, calls the run() method on the event thread, then 
064:             * unblocks the caller.
065:             */
066:            public synchronized void invokeAndWait() {
067:                dpy.callSerially(callback);
068:                done = false;
069:
070:                try {
071:                    while (!done) {
072:                        wait();
073:                    }
074:                } catch (InterruptedException ignore) {
075:                }
076:            }
077:
078:            /**
079:             * Subclassers may override this if they wish to provide any specialized
080:             * behavior.  The default implementation does nothing.
081:             */
082:            public void run() {
083:            }
084:
085:            /**
086:             * Called on the event thread when the callSerially event reaches the
087:             * front of the queue. Calls the client's run() method and awakens the 
088:             * thread that had called invokeAndWait().
089:             */
090:            synchronized void called() {
091:                run();
092:                done = true;
093:                notifyAll();
094:            }
095:
096:            /**
097:             * A nested class that provides a run() method to callSerially(), distinct 
098:             * from the run() method that can be overridden by clients.
099:             */
100:            class Callback implements  Runnable {
101:                public void run() {
102:                    called();
103:                }
104:            }
105:        }
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