Source Code Cross Referenced for ScreenUpdater.java in  » 6.0-JDK-Modules » j2me » sun » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        /*
002:         * @(#)ScreenUpdater.java	1.30 06/10/10
003:         *
004:         * Copyright  1990-2006 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:
028:        package sun.awt;
029:
030:        class ScreenUpdaterEntry {
031:            UpdateClient client;
032:            long when;
033:            ScreenUpdaterEntry next;
034:            Object arg;
035:
036:            ScreenUpdaterEntry(UpdateClient client, long when, Object arg,
037:                    ScreenUpdaterEntry next) {
038:                this .client = client;
039:                this .when = when;
040:                this .arg = arg;
041:                this .next = next;
042:            }
043:        }
044:
045:        /**
046:         * A seperate low priority thread that warns clients
047:         * when they need to update the screen. Clients that
048:         * need a wakeup call need to call Notify().
049:         *
050:         * @version 	1.20, 07/01/98
051:         * @author 	Arthur van Hoff
052:         */
053:        public class ScreenUpdater extends Thread {
054:            private ScreenUpdaterEntry first;
055:            /**
056:             * The screen updater. 
057:             */
058:            public final static ScreenUpdater updater = initScreenUpdater();
059:
060:            private static ScreenUpdater initScreenUpdater() {
061:                return (ScreenUpdater) java.security.AccessController
062:                        .doPrivileged(new java.security.PrivilegedAction() {
063:                            public Object run() {
064:                                ScreenUpdater scr = new ScreenUpdater();
065:                                scr.setContextClassLoader(null);
066:                                return scr;
067:                            }
068:                        });
069:            }
070:
071:            private static ThreadGroup getScreenUpdaterThreadGroup() {
072:                ThreadGroup g = currentThread().getThreadGroup();
073:                while ((g.getParent() != null)
074:                        && (g.getParent().getParent() != null)) {
075:                    g = g.getParent();
076:                }
077:                return g;
078:            }
079:
080:            /**
081:             * Constructor. Starts the thread.
082:             */
083:            private ScreenUpdater() {
084:                super (getScreenUpdaterThreadGroup(), "Screen Updater");
085:                start();
086:            }
087:
088:            /**
089:             * Update the next client
090:             */
091:            private synchronized ScreenUpdaterEntry nextEntry()
092:                    throws InterruptedException {
093:                while (true) {
094:                    if (first == null) {
095:                        wait();
096:                        continue;
097:                    }
098:                    long delay = first.when - System.currentTimeMillis();
099:                    if (delay <= 0) {
100:                        ScreenUpdaterEntry entry = first;
101:                        first = first.next;
102:                        return entry;
103:                    }
104:                    wait(delay);
105:                }
106:            }
107:
108:            /**
109:             * The main body of the screen updater.
110:             */
111:            public void run() {
112:                try {
113:                    while (true) {
114:                        setPriority(NORM_PRIORITY - 1);
115:                        ScreenUpdaterEntry entry = nextEntry();
116:                        setPriority(NORM_PRIORITY + 1);
117:                        try {
118:                            entry.client.updateClient(entry.arg);
119:                        } catch (Throwable e) {
120:                            e.printStackTrace();
121:                        }
122:                        // Because this thread is permanent, we don't want to defeat
123:                        // the garbage collector by having dangling references to
124:                        // objects we no longer care about. Clear out entry so that
125:                        // when we go back to sleep in nextEntry we won't hold a
126:                        // dangling reference to the previous entry we processed.
127:                        entry = null;
128:                    }
129:                } catch (InterruptedException e) {
130:                }
131:            }
132:
133:            /**
134:             * Notify the screen updater that a client needs
135:             * updating. As soon as the screen updater is
136:             * scheduled to run it will ask all of clients that
137:             * need updating to update the screen.
138:             */
139:            public void notify(UpdateClient client) {
140:                notify(client, 100, null);
141:            }
142:
143:            public synchronized void notify(UpdateClient client, long delay) {
144:                notify(client, delay, null);
145:            }
146:
147:            public synchronized void notify(UpdateClient client, long delay,
148:                    Object arg) {
149:                long when = System.currentTimeMillis() + delay;
150:                long nextwhen = (first != null) ? first.when : -1L;
151:                if (first != null) {
152:                    if ((first.client == client) && (first.arg == arg)) {
153:                        if (when >= first.when) {
154:                            return;
155:                        }
156:                        first = first.next;
157:                    } else {
158:                        for (ScreenUpdaterEntry e = first; e.next != null; e = e.next) {
159:                            if ((e.next.client == client)
160:                                    && (e.next.arg == arg)) {
161:                                if (when >= e.next.when) {
162:                                    return;
163:                                }
164:                                e.next = e.next.next;
165:                                break;
166:                            }
167:                        }
168:                    }
169:                }
170:                if ((first == null) || (first.when > when)) {
171:                    first = new ScreenUpdaterEntry(client, when, arg, first);
172:                } else {
173:                    for (ScreenUpdaterEntry e = first;; e = e.next) {
174:                        if ((e.next == null) || (e.next.when > when)) {
175:                            e.next = new ScreenUpdaterEntry(client, when, arg,
176:                                    e.next);
177:                            break;
178:                        }
179:                    }
180:                }
181:                if (nextwhen != first.when) {
182:                    super .notify();
183:                }
184:            }
185:
186:            /**
187:             * Remove any pending entries for the specified client.
188:             * This method is normally called by the client's dispose() method.
189:             */
190:            public synchronized void removeClient(UpdateClient client) {
191:                ScreenUpdaterEntry entry = first;
192:                ScreenUpdaterEntry prev = null;
193:                while (entry != null) {
194:                    if (entry.client.equals(client)) {
195:                        if (prev == null) {
196:                            first = entry.next;
197:                        } else {
198:                            prev.next = entry.next;
199:                        }
200:                    } else {
201:                        prev = entry;
202:                    }
203:                    entry = entry.next;
204:                }
205:            }
206:        }
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