public void viewAccepted(View v) {
member_size = v.size();
if (mainFrame != null) setTitle();
members.clear();
members.addAll(v.getMembers());
if (v instanceof MergeView) {
System.out.println("** MergeView=" + v);
// This is an example of a simple merge function, which fetches the state from the coordinator
// on a merge and overwrites all of its own state
if (use_state && !members.isEmpty()) {
Address coord = members.get(0);
Address local_addr = channel.getAddress();
if (local_addr != null && !local_addr.equals(coord)) {
try {
System.out.println("fetching state from " + coord);
channel.getState(coord, 5000);
} catch (Exception e) {
e.printStackTrace();
}
}
}
} else System.out.println("** View=" + v);
}
public void go() throws Exception {
if (!no_channel && !use_state) {
channel.connect(groupname);
}
mainFrame = new JFrame();
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel = new DrawPanel(use_state);
panel.setBackground(background_color);
sub_panel = new JPanel();
mainFrame.getContentPane().add("Center", panel);
clear_button = new JButton("Clear");
clear_button.setFont(default_font);
clear_button.addActionListener(this);
leave_button = new JButton("Leave");
leave_button.setFont(default_font);
leave_button.addActionListener(this);
sub_panel.add("South", clear_button);
sub_panel.add("South", leave_button);
mainFrame.getContentPane().add("South", sub_panel);
mainFrame.setBackground(background_color);
clear_button.setForeground(Color.blue);
leave_button.setForeground(Color.blue);
mainFrame.pack();
mainFrame.setLocation(15, 25);
mainFrame.setBounds(new Rectangle(250, 250));
if (!no_channel && use_state) {
channel.connect(groupname, null, null, state_timeout);
}
mainFrame.setVisible(true);
setTitle();
}
public Draw(Channel channel, boolean use_state, long state_timeout) throws Exception {
this.channel = channel;
channel.setReceiver(this);
channel.addChannelListener(this);
this.use_state = use_state;
this.state_timeout = state_timeout;
}
public void start(String props) throws Exception {
channel = new JChannel(props);
channel.setReceiver(this);
channel.connect("ViewDemo");
while (true) {
Util.sleep(10000);
}
}
void setTitle(String title) {
String tmp = "";
if (no_channel) {
mainFrame.setTitle(" Draw Demo ");
return;
}
if (title != null) {
mainFrame.setTitle(title);
} else {
if (channel.getAddress() != null) tmp += channel.getAddress();
tmp += " (" + member_size + ")";
mainFrame.setTitle(tmp);
}
}
public void receive(Message msg) {
byte[] buf = msg.getRawBuffer();
if (buf == null) {
System.err.println(
"["
+ channel.getAddress()
+ "] received null buffer from "
+ msg.getSrc()
+ ", headers: "
+ msg.printHeaders());
return;
}
try {
DrawCommand comm =
(DrawCommand)
Util.streamableFromByteBuffer(
DrawCommand.class, buf, msg.getOffset(), msg.getLength());
switch (comm.mode) {
case DrawCommand.DRAW:
if (panel != null) panel.drawPoint(comm);
break;
case DrawCommand.CLEAR:
clearPanel();
break;
default:
System.err.println("***** received invalid draw command " + comm.mode);
break;
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void stop() {
if (!no_channel) {
try {
channel.close();
} catch (Exception ex) {
System.err.println(ex);
}
}
mainFrame.setVisible(false);
mainFrame.dispose();
}
public void sendClearPanelMsg() {
DrawCommand comm = new DrawCommand(DrawCommand.CLEAR);
try {
byte[] buf = Util.streamableToByteBuffer(comm);
if (use_unicasts) sendToAll(buf);
else channel.send(new Message(null, null, buf));
} catch (Exception ex) {
System.err.println(ex);
}
}
public Draw(
String props,
boolean no_channel,
boolean jmx,
boolean use_state,
long state_timeout,
boolean use_blocking,
boolean use_unicasts,
String name)
throws Exception {
this.no_channel = no_channel;
this.jmx = jmx;
this.use_state = use_state;
this.state_timeout = state_timeout;
this.use_unicasts = use_unicasts;
if (no_channel) return;
channel = new JChannel(props);
if (name != null) channel.setName(name);
if (use_blocking) channel.setOpt(Channel.BLOCK, Boolean.TRUE);
channel.setReceiver(this);
channel.addChannelListener(this);
}
public Draw(Channel channel) throws Exception {
this.channel = channel;
channel.setReceiver(this);
channel.addChannelListener(this);
}
private void sendToAll(byte[] buf) throws Exception {
for (Address mbr : members) {
Message msg = new Message(mbr, null, buf);
channel.send(msg);
}
}
