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1
3 package org.jgroups.demos.wb;
4
5 import org.jgroups.*;
6 import org.jgroups.blocks.*;
7 import org.jgroups.blocks.GroupRequest;
8 import org.jgroups.blocks.RpcDispatcher;
9
10 import java.applet.Applet  ;
11 import java.awt.*;
12 import java.awt.event.*;
13
14
15
16
22 public class Whiteboard extends Applet implements ActionListener, MessageListener, MembershipListener,
23 ComponentListener, FocusListener {
24 public RpcDispatcher disp;
25 Channel channel;
26 GraphPanel panel;
27 private Button leave_button;
28 private Label mbr_label;
29 private final Font default_font=new Font("Helvetica",Font.PLAIN,12);
30 private String props=null;
31 public static final String groupname="WbGrp";
32 private boolean application=false;
33
34
35 public void receive(Message m) {
36 ;
37 }
38
39 public byte[] getState() {
40 panel.saveState();
41 return panel.getState();
42 }
43
44 public void setState(byte[] new_state) {
45 panel.setState(new_state);
46 }
47
48
49 private String getInfo() {
50 StringBuffer ret = new StringBuffer ();
51 ret.append(" (" + System.getProperty("os.name") + ' ' + System.getProperty("os.version") +
52 ' ' + System.getProperty("os.arch") + ')');
53 return ret.toString();
54 }
55
56 private Frame findParent() {
57 Component retval = getParent();
58
59 while (retval != null) {
60 if (retval instanceof Frame)
61 return (Frame) retval;
62 retval = retval.getParent();
63 }
64 return null;
65 }
66
67
68 public Whiteboard() { }
70
71 public Whiteboard(String properties) { application = true;
73 props = properties;
74
75 }
76
77
78 public void init() {
79 setLayout(new BorderLayout());
80 panel = new GraphPanel(this);
81 panel.setBackground(Color.white);
82 add("Center", panel);
83 Panel p = new Panel();
84 leave_button = new Button("Exit");
85 leave_button.setFont(default_font);
86 leave_button.addActionListener(this);
87 mbr_label = new Label("1 mbr(s)");
88 mbr_label.setFont(default_font);
89 p.add("South", leave_button);
90 p.add("South", mbr_label);
91 add("South", p);
92
93 if (!application)
94 props = getParameter("properties");
95 if (props == null) {
96 props = "UDP:PING:FD:" +
98 "pbcast.PBCAST:UNICAST:FRAG:pbcast.GMS:" +
99 "pbcast.STATE_TRANSFER";
100
101
102
103
104 }
108
109 System.out.println("properties are " + props);
110
111 try {
112 channel = new JChannel(props);
113 disp = new RpcDispatcher(channel, this, this, this);
114 channel.connect(groupname);
115 System.out.println("INIT()");
116 channel.getState(null, 0);
117 } catch (Exception e) {
118 System.err.println("Whiteboard.init(): " + e);
119 }
120 panel.my_addr = channel.getLocalAddress();
121
122
123 UserInfoDialog dlg = new UserInfoDialog(findParent());
124 String n = dlg.getUserName();
125 String info = getInfo();
126 panel.start(n + info);
127
128
129 addComponentListener(this);
130 addFocusListener(this);
131 }
132
133
134 public void destroy() {
135 if (disp != null) {
136 try {
137 MethodCall call = new MethodCall("removeNode", new Object [] {panel.my_addr}, new String [] {Object .class.getName()});
138 disp.callRemoteMethods(null, call, GroupRequest.GET_ALL, 0);
139 } catch (Exception e) {
140 System.err.println(e);
141 }
142 channel.close();
143 disp = null;
144 if (panel != null) {
145 panel.stop();
146 panel = null;
147 }
148 }
149
150 }
151
152
153 public void repaint() {
154 if (panel != null)
155 panel.repaint();
156 }
157
158
159 public void actionPerformed(ActionEvent e) {
160 String command = e.getActionCommand();
161
162 if ("Exit".equals(command)) {
163 try {
164 setVisible(false);
165 destroy();
166 if (application) {
167 ((Frame) getParent()).dispose();
168 System.exit(0);
169 }
170 } catch (Exception ex) {
171 System.err.println(ex);
172 }
173
174 } else
175 System.out.println("Unknown action");
176 }
177
178
179 public void viewAccepted(View v) {
180 if (v != null) {
181 if (mbr_label != null)
182 mbr_label.setText(v.size() + " mbr(s)");
183 }
184 panel.adjustNodes(v.getMembers());
185 }
186
187 public void suspect(Address obj) {
188 }
189
190 public void block() {
191 }
192
193
194 public void moveNode(Node n) {
195 panel.moveNode(n);
196 }
197
198
199 public void addNode(String lbl, Address addr, int xloc, int yloc) {
200 panel.addNode(lbl, addr, xloc, yloc);
201 }
202
203
204 public void removeNode(Object addr) {
205 panel.removeNode(addr);
206 }
207
208
209 public void displayMessage(String sender, String msg) {
210 new MessageDialog(findParent(), sender, msg);
211 panel.repaint();
212 }
213
214
215 public void componentResized(ComponentEvent e) {
216 if (panel != null) panel.repaint();
217 }
218
219 public void componentMoved(ComponentEvent e) {
220 }
221
222 public void componentShown(ComponentEvent e) {
223 if (panel != null) panel.repaint();
224 }
225
226 public void componentHidden(ComponentEvent e) {
227 }
228
229
230 public void focusGained(FocusEvent e) {
231 if (panel != null) panel.repaint();
232 }
233
234
235 public void focusLost(FocusEvent e) {
236 }
237
238
239 public static void main(String [] args) {
240 String props = null;
241
242 for (int i = 0; i < args.length; i++) {
243 if ("-props".equals(args[i])) {
244 props = args[++i];
245 continue;
246 }
247 help();
248 return;
249 }
250
251 Whiteboard wb = new Whiteboard(props);
252 new ApplFrame("Whiteboard Application", wb);
253 }
254
255 static void help() {
256 System.out.println("Whiteboard [-help] [-props <props>]");
257 }
258
259
260 }
261
262
263 class ApplFrame extends Frame implements WindowListener, ComponentListener {
264 Whiteboard wb = null;
265
266 public ApplFrame(String title, Whiteboard wb) {
267 super(title);
268 this.wb = wb;
269 add(wb);
270 setSize(299, 299);
271 setVisible(true);
272 wb.init();
273 setSize(300, 300);
274 addWindowListener(this);
275 addComponentListener(this);
276 }
277
278
279 public void windowOpened(WindowEvent e) {
280 }
281
282 public void windowClosing(WindowEvent e) {
283 dispose();
284 System.exit(0);
285 }
286
287 public void windowClosed(WindowEvent e) {
288 }
289
290 public void windowIconified(WindowEvent e) {
291 }
292
293 public void windowDeiconified(WindowEvent e) {
294 wb.repaint();
295 }
296
297 public void windowActivated(WindowEvent e) {
298 wb.repaint();
299 }
300
301 public void windowDeactivated(WindowEvent e) {
302 }
303
304 public void componentResized(ComponentEvent e) {
305 wb.repaint();
306 }
307
308 public void componentMoved(ComponentEvent e) {
309 }
310
311
312 public void componentShown(ComponentEvent e) {
313 }
314
315 public void componentHidden(ComponentEvent e) {
316 }
317
318
319 }
320
321
322 |
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