Source Code Cross Referenced for Draw.java in  » Net » JGroups-2.4.1-sp3 » org » jgroups » demos » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » JGroups 2.4.1 sp3 » org.jgroups.demos 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // $Id: Draw.java,v 1.33 2006/10/27 16:25:58 belaban Exp $
002:
003:        package org.jgroups.demos;
004:
005:        import org.jgroups.*;
006:        import org.jgroups.debug.Debugger;
007:        import org.jgroups.jmx.JmxConfigurator;
008:        import org.jgroups.util.Util;
009:
010:        import javax.management.MBeanServer;
011:        import javax.swing.*;
012:        import java.awt.*;
013:        import java.awt.event.*;
014:        import java.util.Random;
015:
016:        /**
017:         * Shared whiteboard, each new instance joins the same group. Each instance chooses a random color,
018:         * mouse moves are broadcast to all group members, which then apply them to their canvas<p>
019:         * @author Bela Ban, Oct 17 2001
020:         */
021:        public class Draw extends ExtendedReceiverAdapter implements 
022:                ActionListener, ChannelListener {
023:            String groupname = "DrawGroupDemo";
024:            private Channel channel = null;
025:            private int member_size = 1;
026:            Debugger debugger = null;
027:            final boolean first = true;
028:            final boolean cummulative = true;
029:            private JFrame mainFrame = null;
030:            private JPanel sub_panel = null;
031:            private DrawPanel panel = null;
032:            private JButton clear_button, leave_button;
033:            private final Random random = new Random(System.currentTimeMillis());
034:            private final Font default_font = new Font("Helvetica", Font.PLAIN,
035:                    12);
036:            private final Color draw_color = selectColor();
037:            private final Color background_color = Color.white;
038:            boolean no_channel = false;
039:            boolean jmx;
040:
041:            public Draw(String props, boolean debug, boolean cummulative,
042:                    boolean no_channel, boolean jmx) throws Exception {
043:                this .no_channel = no_channel;
044:                this .jmx = jmx;
045:                if (no_channel)
046:                    return;
047:
048:                channel = new JChannel(props);
049:                // channel.setOpt(Channel.BLOCK, Boolean.TRUE);
050:                if (debug) {
051:                    debugger = new Debugger((JChannel) channel, cummulative);
052:                    debugger.start();
053:                }
054:                channel.setOpt(Channel.AUTO_RECONNECT, Boolean.TRUE);
055:                channel.setReceiver(this );
056:                channel.addChannelListener(this );
057:            }
058:
059:            public Draw(Channel channel) throws Exception {
060:                this .channel = channel;
061:                channel.setOpt(Channel.AUTO_RECONNECT, Boolean.TRUE);
062:                channel.setReceiver(this );
063:                channel.addChannelListener(this );
064:            }
065:
066:            public String getGroupName() {
067:                return groupname;
068:            }
069:
070:            public void setGroupName(String groupname) {
071:                if (groupname != null)
072:                    this .groupname = groupname;
073:            }
074:
075:            public static void main(String[] args) {
076:                Draw draw = null;
077:                String props = null;
078:                boolean debug = false;
079:                boolean cummulative = false;
080:                boolean no_channel = false;
081:                boolean jmx = false;
082:                String group_name = null;
083:
084:                for (int i = 0; i < args.length; i++) {
085:                    if ("-help".equals(args[i])) {
086:                        help();
087:                        return;
088:                    }
089:                    if ("-debug".equals(args[i])) {
090:                        debug = true;
091:                        continue;
092:                    }
093:                    if ("-cummulative".equals(args[i])) {
094:                        cummulative = true;
095:                        continue;
096:                    }
097:                    if ("-props".equals(args[i])) {
098:                        props = args[++i];
099:                        continue;
100:                    }
101:                    if ("-no_channel".equals(args[i])) {
102:                        no_channel = true;
103:                        continue;
104:                    }
105:                    if ("-jmx".equals(args[i])) {
106:                        jmx = true;
107:                        continue;
108:                    }
109:                    if ("-groupname".equals(args[i])) {
110:                        group_name = args[++i];
111:                        continue;
112:                    }
113:
114:                    help();
115:                    return;
116:                }
117:
118:                if (props == null) {
119:                    props = "UDP(down_thread=false;mcast_send_buf_size=640000;mcast_port=45566;discard_incompatible_packets=true;"
120:                            + "ucast_recv_buf_size=20000000;mcast_addr=228.10.10.10;up_thread=false;loopback=false;"
121:                            + "mcast_recv_buf_size=25000000;max_bundle_size=64000;max_bundle_timeout=30;"
122:                            + "use_incoming_packet_handler=true;use_outgoing_packet_handler=false;"
123:                            + "ucast_send_buf_size=640000;tos=16;enable_bundling=true;ip_ttl=2):"
124:                            + "PING(timeout=2000;down_thread=false;num_initial_members=3;up_thread=false):"
125:                            + "MERGE2(max_interval=10000;down_thread=false;min_interval=5000;up_thread=false):"
126:                            + "FD(timeout=2000;max_tries=3;down_thread=false;up_thread=false):"
127:                            + "VERIFY_SUSPECT(timeout=1500;down_thread=false;up_thread=false):"
128:                            + "pbcast.NAKACK(max_xmit_size=60000;down_thread=false;use_mcast_xmit=false;gc_lag=0;"
129:                            + "discard_delivered_msgs=true;up_thread=false;retransmit_timeout=100,200,300,600,1200,2400,4800):"
130:                            + "UNICAST(timeout=300,600,1200,2400,3600;down_thread=false;up_thread=false):"
131:                            + "pbcast.STABLE(stability_delay=1000;desired_avg_gossip=50000;max_bytes=400000;down_thread=false;"
132:                            + "up_thread=false):"
133:                            + "VIEW_SYNC(down_thread=false;avg_send_interval=60000;up_thread=false):"
134:                            + "pbcast.GMS(print_local_addr=true;join_timeout=3000;down_thread=false;"
135:                            + "join_retry_timeout=2000;up_thread=false;shun=true):"
136:                            + "FC(max_credits=2000000;down_thread=false;up_thread=false;min_threshold=0.10):"
137:                            + "FRAG2(frag_size=60000;down_thread=false;up_thread=false):"
138:                            + "pbcast.STATE_TRANSFER(down_thread=false;up_thread=false)";
139:                }
140:
141:                try {
142:                    draw = new Draw(props, debug, cummulative, no_channel, jmx);
143:                    if (group_name != null)
144:                        draw.setGroupName(group_name);
145:                    draw.go();
146:                } catch (Throwable e) {
147:                    e.printStackTrace();
148:                    System.exit(0);
149:                }
150:            }
151:
152:            static void help() {
153:                System.out
154:                        .println("\nDraw [-help] [-debug] [-cummulative] [-no_channel] [-props <protocol stack definition>]"
155:                                + " [-groupname <name>]");
156:                System.out.println("-debug: brings up a visual debugger");
157:                System.out
158:                        .println("-no_channel: doesn't use JGroups at all, any drawing will be relected on the "
159:                                + "whiteboard directly");
160:                System.out
161:                        .println("-props: argument can be an old-style protocol stack specification, or it can be "
162:                                + "a URL. In the latter case, the protocol specification will be read from the URL\n");
163:            }
164:
165:            private Color selectColor() {
166:                int red = (Math.abs(random.nextInt()) % 255);
167:                int green = (Math.abs(random.nextInt()) % 255);
168:                int blue = (Math.abs(random.nextInt()) % 255);
169:                return new Color(red, green, blue);
170:            }
171:
172:            public void go() throws Exception {
173:                if (!no_channel) {
174:                    channel.connect(groupname);
175:                    if (jmx) {
176:                        MBeanServer server = Util.getMBeanServer();
177:                        if (server == null)
178:                            throw new Exception(
179:                                    "No MBeanServers found;"
180:                                            + "\nDraw needs to be run with an MBeanServer present, or inside JDK 5");
181:                        JmxConfigurator.registerChannel((JChannel) channel,
182:                                server, "jgroups", channel.getClusterName(),
183:                                true);
184:                    }
185:                }
186:                mainFrame = new JFrame();
187:                mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
188:                panel = new DrawPanel();
189:                panel.setBackground(background_color);
190:                sub_panel = new JPanel();
191:                mainFrame.getContentPane().add("Center", panel);
192:                clear_button = new JButton("Clear");
193:                clear_button.setFont(default_font);
194:                clear_button.addActionListener(this );
195:                leave_button = new JButton("Leave");
196:                leave_button.setFont(default_font);
197:                leave_button.addActionListener(this );
198:                sub_panel.add("South", clear_button);
199:                sub_panel.add("South", leave_button);
200:                mainFrame.getContentPane().add("South", sub_panel);
201:                mainFrame.setBackground(background_color);
202:                clear_button.setForeground(Color.blue);
203:                leave_button.setForeground(Color.blue);
204:                setTitle();
205:                mainFrame.pack();
206:                mainFrame.setLocation(15, 25);
207:                mainFrame.setBounds(new Rectangle(250, 250));
208:                mainFrame.setVisible(true);
209:            }
210:
211:            void setTitle(String title) {
212:                String tmp = "";
213:                if (no_channel) {
214:                    mainFrame.setTitle(" Draw Demo ");
215:                    return;
216:                }
217:                if (title != null) {
218:                    mainFrame.setTitle(title);
219:                } else {
220:                    if (channel.getLocalAddress() != null)
221:                        tmp += channel.getLocalAddress();
222:                    tmp += " (" + member_size + ")";
223:                    mainFrame.setTitle(tmp);
224:                }
225:            }
226:
227:            void setTitle() {
228:                setTitle(null);
229:            }
230:
231:            public void receive(Message msg) {
232:                byte[] buf = msg.getRawBuffer();
233:                if (buf == null) {
234:                    System.err.println("received null buffer from "
235:                            + msg.getSrc() + ", headers: " + msg.getHeaders());
236:                    return;
237:                }
238:
239:                try {
240:                    DrawCommand comm = (DrawCommand) Util
241:                            .streamableFromByteBuffer(DrawCommand.class, buf,
242:                                    msg.getOffset(), msg.getLength());
243:                    switch (comm.mode) {
244:                    case DrawCommand.DRAW:
245:                        if (panel != null)
246:                            panel.drawPoint(comm);
247:                        break;
248:                    case DrawCommand.CLEAR:
249:                        clearPanel();
250:                        break;
251:                    default:
252:                        System.err
253:                                .println("***** received invalid draw command "
254:                                        + comm.mode);
255:                        break;
256:                    }
257:                } catch (Exception e) {
258:                    e.printStackTrace();
259:                }
260:            }
261:
262:            public void viewAccepted(View v) {
263:                if (v instanceof  MergeView)
264:                    System.out.println("** MergeView=" + v);
265:                else
266:                    System.out.println("** View=" + v);
267:                member_size = v.size();
268:                if (mainFrame != null)
269:                    setTitle();
270:            }
271:
272:            public void block() {
273:                System.out.println("--  received BlockEvent");
274:            }
275:
276:            public void unblock() {
277:                System.out.println("-- received UnblockEvent");
278:            }
279:
280:            /* --------------- Callbacks --------------- */
281:
282:            public void clearPanel() {
283:                if (panel != null)
284:                    panel.clear();
285:            }
286:
287:            public void sendClearPanelMsg() {
288:                int tmp[] = new int[1];
289:                tmp[0] = 0;
290:                DrawCommand comm = new DrawCommand(DrawCommand.CLEAR);
291:
292:                try {
293:                    byte[] buf = Util.streamableToByteBuffer(comm);
294:                    channel.send(new Message(null, null, buf));
295:                } catch (Exception ex) {
296:                    System.err.println(ex);
297:                }
298:            }
299:
300:            public void actionPerformed(ActionEvent e) {
301:                String command = e.getActionCommand();
302:                if ("Clear".equals(command)) {
303:                    if (no_channel) {
304:                        clearPanel();
305:                        return;
306:                    }
307:                    sendClearPanelMsg();
308:                } else if ("Leave".equals(command)) {
309:                    stop();
310:                } else
311:                    System.out.println("Unknown action");
312:            }
313:
314:            public void stop() {
315:                if (!no_channel) {
316:                    try {
317:                        channel.close();
318:                    } catch (Exception ex) {
319:                        System.err.println(ex);
320:                    }
321:                }
322:                mainFrame.setVisible(false);
323:                mainFrame.dispose();
324:            }
325:
326:            /* ------------------------------ ChannelListener interface -------------------------- */
327:
328:            public void channelConnected(Channel channel) {
329:
330:            }
331:
332:            public void channelDisconnected(Channel channel) {
333:
334:            }
335:
336:            public void channelClosed(Channel channel) {
337:
338:            }
339:
340:            public void channelShunned() {
341:                System.out
342:                        .println("-- received EXIT, waiting for ChannelReconnected callback");
343:                setTitle(" Draw Demo - shunned ");
344:            }
345:
346:            public void channelReconnected(Address addr) {
347:                setTitle();
348:            }
349:
350:            /* --------------------------- End of ChannelListener interface ---------------------- */
351:
352:            private class DrawPanel extends JPanel implements 
353:                    MouseMotionListener {
354:                final Dimension preferred_size = new Dimension(235, 170);
355:                Image img = null; // for drawing pixels
356:                Dimension d, imgsize = null;
357:                Graphics gr = null;
358:
359:                public DrawPanel() {
360:                    createOffscreenImage();
361:                    addMouseMotionListener(this );
362:                    addComponentListener(new ComponentAdapter() {
363:                        public void componentResized(ComponentEvent e) {
364:                            if (getWidth() <= 0 || getHeight() <= 0)
365:                                return;
366:                            createOffscreenImage();
367:                        }
368:                    });
369:                }
370:
371:                final void createOffscreenImage() {
372:                    d = getSize();
373:                    if (img == null || imgsize == null
374:                            || imgsize.width != d.width
375:                            || imgsize.height != d.height) {
376:                        img = createImage(d.width, d.height);
377:                        if (img != null)
378:                            gr = img.getGraphics();
379:                        imgsize = d;
380:                    }
381:                }
382:
383:                /* ---------------------- MouseMotionListener interface------------------------- */
384:
385:                public void mouseMoved(MouseEvent e) {
386:                }
387:
388:                public void mouseDragged(MouseEvent e) {
389:                    int x = e.getX(), y = e.getY();
390:                    DrawCommand comm = new DrawCommand(DrawCommand.DRAW, x, y,
391:                            draw_color.getRed(), draw_color.getGreen(),
392:                            draw_color.getBlue());
393:
394:                    if (no_channel) {
395:                        drawPoint(comm);
396:                        return;
397:                    }
398:
399:                    try {
400:                        byte[] buf = Util.streamableToByteBuffer(comm);
401:                        channel.send(new Message(null, null, buf));
402:                        Thread.yield(); // gives the repainter some breath
403:                    } catch (Exception ex) {
404:                        System.err.println(ex);
405:                    }
406:                }
407:
408:                /* ------------------- End of MouseMotionListener interface --------------------- */
409:
410:                /**
411:                 * Adds pixel to queue and calls repaint() whenever we have MAX_ITEMS pixels in the queue
412:                 * or when MAX_TIME msecs have elapsed (whichever comes first). The advantage compared to just calling
413:                 * repaint() after adding a pixel to the queue is that repaint() can most often draw multiple points
414:                 * at the same time.
415:                 */
416:                public void drawPoint(DrawCommand c) {
417:                    if (c == null || gr == null)
418:                        return;
419:                    gr.setColor(new Color(c.r, c.g, c.b));
420:                    gr.fillOval(c.x, c.y, 10, 10);
421:                    repaint();
422:                }
423:
424:                public void clear() {
425:                    if (gr == null)
426:                        return;
427:                    gr.clearRect(0, 0, getSize().width, getSize().height);
428:                    repaint();
429:                }
430:
431:                public Dimension getPreferredSize() {
432:                    return preferred_size;
433:                }
434:
435:                public void paintComponent(Graphics g) {
436:                    super .paintComponent(g);
437:                    if (img != null) {
438:                        g.drawImage(img, 0, 0, null);
439:                    }
440:                }
441:
442:            }
443:
444:        }
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