/**
* Constructor 1
*
* @param props
* @param no_channel
* @param jmx
* @param use_state
* @param state_timeout
* @param use_unicasts
* @param name
* @param send_own_state_on_merge
* @param gen
* @throws Exception
*/
public JWhiteBoard(
String props,
boolean no_channel,
boolean jmx,
boolean use_state,
long state_timeout,
boolean use_unicasts,
String name,
boolean send_own_state_on_merge,
AddressGenerator gen)
throws Exception {
this.noChannel = no_channel;
this.jmx = jmx;
this.useState = use_state;
this.stateTimeout = state_timeout;
this.use_unicasts = use_unicasts;
if (no_channel) return;
channel = new JChannel(props);
if (gen != null) channel.addAddressGenerator(gen);
if (name != null) channel.setName(name);
channel.setReceiver(this);
channel.addChannelListener(this);
this.send_own_state_on_merge = send_own_state_on_merge;
}
/** Execute when new member join or leave Group */
public void viewAccepted(View v) {
memberSize = v.size();
if (mainFrame != null) setTitle();
members.clear();
members.addAll(v.getMembers());
if (v instanceof MergeView) {
System.out.println("** " + v);
// This is a simple merge function, which fetches the state from the coordinator
// on a merge and overwrites all of its own state
if (useState && !members.isEmpty()) {
Address coord = members.get(0);
Address local_addr = channel.getAddress();
if (local_addr != null && !local_addr.equals(coord)) {
try {
// make a copy of our state first
Map<Point, Color> copy = null;
if (send_own_state_on_merge) {
synchronized (drawPanel.state) {
copy = new LinkedHashMap<Point, Color>(drawPanel.state);
}
}
System.out.println("fetching state from " + coord);
channel.getState(coord, 5000);
if (copy != null)
sendOwnState(copy); // multicast my own state so everybody else has it too
} catch (Exception e) {
e.printStackTrace();
}
}
}
} else System.out.println("** View=" + v);
}
/**
* Init JWhiteBoard interface
*
* @throws Exception
*/
public void go() throws Exception {
if (!noChannel && !useState) channel.connect(groupName);
mainFrame = new JFrame();
mainFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
drawPanel = new DrawPanel(useState);
drawPanel.setBackground(backgroundColor);
subPanel = new JPanel();
mainFrame.getContentPane().add("Center", drawPanel);
clearButton = new JButton("Clean");
clearButton.setFont(defaultFont);
clearButton.addActionListener(this);
leaveButton = new JButton("Exit");
leaveButton.setFont(defaultFont);
leaveButton.addActionListener(this);
subPanel.add("South", clearButton);
subPanel.add("South", leaveButton);
mainFrame.getContentPane().add("South", subPanel);
mainFrame.setBackground(backgroundColor);
clearButton.setForeground(Color.blue);
leaveButton.setForeground(Color.blue);
mainFrame.pack();
mainFrame.setLocation(15, 25);
mainFrame.setBounds(new Rectangle(250, 250));
if (!noChannel && useState) {
channel.connect(groupName, null, stateTimeout);
}
mainFrame.setVisible(true);
}
/**
* Constructor 3
*
* @param channel
* @param use_state: Save state of Group
* @param state_timeout: State time out
* @throws Exception
*/
public JWhiteBoard(JChannel channel, boolean use_state, long state_timeout) throws Exception {
this.channel = channel;
channel.setReceiver(this);
channel.addChannelListener(this);
this.useState = use_state;
this.stateTimeout = state_timeout;
}
public void connect() {
try {
channel.connect("TOTAL_TOKEN_DEMO_GROUP");
} catch (ChannelException e) {
e.printStackTrace();
}
receiverThread = new ReceiverThread();
receiverThread.start();
Address a = channel.getAddress();
if (a != null) setTitle(a.toString());
else setTitle("Not connected");
control.connected();
}
/**
* Set Frame's title
*
* @param title : frame's title
*/
void setTitle(String title) {
String tmp = "";
if (noChannel) {
mainFrame.setTitle("JWhiteBoard");
return;
}
if (title != null) {
mainFrame.setTitle(title);
} else {
if (channel.getAddress() != null) tmp += channel.getAddress();
tmp += " (" + memberSize + ")";
mainFrame.setTitle(tmp);
}
}
public void disconnect() {
transmitting = false;
receiverThread.shutDown();
channel.disconnect();
control.disconnected();
setTitle("Not connected");
}
/** When receive a message, analyze message content and then execute the command: Draw or Clear */
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 (drawPanel != null) drawPanel.drawPoint(comm);
break;
case DrawCommand.CLEAR:
clearPanel();
default:
System.err.println("***** received invalid draw command " + comm.mode);
break;
}
} catch (Exception e) {
e.printStackTrace();
}
}
/** Send Clear command to all members in Group */
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);
}
}
/** Leave Group and close JWhiteBoard */
public void stop() {
if (!noChannel) {
try {
channel.close();
} catch (Exception ex) {
System.err.println(ex);
}
}
mainFrame.setVisible(false);
mainFrame.dispose();
}
/**
* Send State (content on WhiteBoard) to all members of Group
*
* @param copy
*/
protected void sendOwnState(final Map<Point, Color> copy) {
if (copy == null) return;
for (Point point : copy.keySet()) {
// we don't need the color: it is our draw_color anyway
DrawCommand comm = new DrawCommand(DrawCommand.DRAW, point.x, point.y, drawColor.getRGB());
try {
byte[] buf = Util.streamableToByteBuffer(comm);
if (use_unicasts) sendToAll(buf);
else channel.send(new Message(null, buf));
} catch (Exception ex) {
System.err.println(ex);
}
}
}
public StackPanel(JChannel channel) {
super();
setBorder(BorderFactory.createTitledBorder("ProtocolStack"));
this.setLayout(new GridLayout(0, 2));
this.stack = channel.getProtocolStack();
Iterator iter = stack.getProtocols().iterator();
String debugLevels[] = new String[] {"DEBUG", "INFO", "ERROR"};
while (iter.hasNext()) {
Protocol p = (Protocol) iter.next();
JLabel field = new JLabel(p.getName());
JComboBox pane = new JComboBox(debugLevels);
this.add(field);
this.add(pane);
}
}
public void run() {
Random r = new Random();
while (true) {
Util.sleep(10);
try {
if (transmitting) {
channel.send(new Message(null, null, new TotalPayload(r.nextInt(255))));
} else {
Util.sleep(200);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* Constructor 2
*
* @param channel
* @throws Exception
*/
public JWhiteBoard(JChannel channel) throws Exception {
this.channel = channel;
channel.setReceiver(this);
channel.addChannelListener(this);
}
/**
* Send message to members in members list only.
*
* @param buf
* @throws Exception
*/
private void sendToAll(byte[] buf) throws Exception {
for (Address mbr : members) channel.send(new Message(mbr, buf));
}
