// $Id: Draw2Channels.java,v 1.10 2006/10/09 11:35:19 belaban Exp $
package org.jgroups.demos;
import org.jgroups.*;
import org.jgroups.Event;
import org.jgroups.util.Util;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
/**
* Same as Draw but using 2 channels: one for view changes (control channel) and the other one for drawing
* (data channel). Ported to use Swing Nov 1 2001, not tested.
* @author Bela Ban, Nov 1 2001
*/
public class Draw2Channels implements ActionListener {
private final String control_groupname="Draw2ChannelsGroup-Control";
private final String data_groupname="Draw2ChannelsGroup-Data";
private Channel control_channel=null;
private Channel data_channel=null;
String control_props=null, data_props=null;
private Receiver control_receiver=null;
private Receiver data_receiver=null;
private int member_size=1;
final boolean first=true;
final boolean cummulative=true;
private JFrame mainFrame=null;
private JPanel sub_panel=null;
private DrawPanel panel=null;
private JButton clear_button, leave_button;
private final Random random=new Random(System.currentTimeMillis());
private final Font default_font=new Font("Helvetica", Font.PLAIN, 12);
private final Color draw_color=selectColor();
private final Color background_color=Color.white;
boolean no_channel=false;
public Draw2Channels(String control_props, String data_props, boolean no_channel) throws Exception {
this.control_props=control_props;
this.data_props=data_props;
this.no_channel=no_channel;
}
public static void main(String[] args) {
Draw2Channels draw=null;
String control_props=null, data_props=null;
boolean no_channel=false;
for(int i=0; i < args.length; i++) {
if("-help".equals(args[i])) {
help();
return;
}
if("-no_channel".equals(args[i])) {
no_channel=true;
continue;
}
help();
return;
}
control_props="UDP(mcast_addr=224.0.0.35;mcast_port=45566;ip_ttl=32;" +
"mcast_send_buf_size=150000;mcast_recv_buf_size=80000):" +
"PING(timeout=2000;num_initial_members=3):" +
"MERGE2(min_interval=5000;max_interval=10000):" +
"FD_SOCK:" +
"VERIFY_SUSPECT(timeout=1500):" +
"pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800):" +
"UNICAST(timeout=5000):" +
"pbcast.STABLE(desired_avg_gossip=20000):" +
"FRAG(frag_size=4096;down_thread=false;up_thread=false):" +
"pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;" +
"shun=false;print_local_addr=true)";
data_props="UDP(mcast_addr=224.10.10.200;mcast_port=5679)";
try {
draw=new Draw2Channels(control_props, data_props, no_channel);
draw.go();
}
catch(Exception e) {
System.err.println(e);
System.exit(0);
}
}
static void help() {
System.out.println("Draw2Channels [-help] [-no_channel]");
}
private Color selectColor() {
int red=(Math.abs(random.nextInt()) % 255);
int green=(Math.abs(random.nextInt()) % 255);
int blue=(Math.abs(random.nextInt()) % 255);
return new Color(red, green, blue);
}
public void go() {
try {
if(!no_channel) {
control_receiver=new ControlReceiver();
data_receiver=new DataReceiver();
System.out.println("Creating control channel");
control_channel=new JChannel(control_props);
control_channel.setReceiver(control_receiver);
System.out.println("Creating data channel");
data_channel=new JChannel(data_props);
data_channel.setReceiver(data_receiver);
// data_channel.SetOpt(Channel.VIEW, Boolean.FALSE);
System.out.println("Connecting data channel");
data_channel.connect(data_groupname);
System.out.println("Connecting control channel");
control_channel.connect(control_groupname);
}
mainFrame=new JFrame();
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel=new DrawPanel();
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 & Exit");
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.setVisible(true);
mainFrame.setBackground(background_color);
clear_button.setForeground(Color.blue);
leave_button.setForeground(Color.blue);
setTitle();
mainFrame.pack();
mainFrame.setLocation(15, 25);
mainFrame.setVisible(true);
}
catch(Exception e) {
System.err.println(e);
}
}
void setTitle() {
String title="";
if(no_channel) {
mainFrame.setTitle(" Draw Demo ");
return;
}
if(control_channel.getLocalAddress() != null)
title+=control_channel.getLocalAddress();
title+=" (" + member_size + ") mbrs";
mainFrame.setTitle(title);
}
public void clearPanel() {
if(panel != null)
panel.clear();
}
public void sendClearPanelMsg() {
int tmp[]=new int[1];
tmp[0]=0;
DrawCommand comm=new DrawCommand(DrawCommand.CLEAR);
try {
byte[] buf=Util.streamableToByteBuffer(comm);
data_channel.send(new Message(null, null, buf));
}
catch(Exception ex) {
System.err.println(ex);
}
}
public void actionPerformed(ActionEvent e) {
String command=e.getActionCommand();
if("Clear".equals(command)) {
if(no_channel) {
clearPanel();
return;
}
sendClearPanelMsg();
}
else if("Leave & Exit".equals(command)) {
if(!no_channel) {
try {
control_channel.close();
}
catch(Exception ex) {
System.err.println(ex);
}
try {
data_channel.close();
}
catch(Exception ex) {
System.err.println(ex);
}
}
mainFrame.setVisible(false);
mainFrame.dispose();
System.exit(0);
}
else
System.out.println("Unknown action");
}
private class DrawPanel extends JPanel implements MouseMotionListener {
final Dimension preferred_size=new Dimension(235, 170);
Image img=null; // for drawing pixels
Dimension d, imgsize;
Graphics gr=null;
public DrawPanel() {
addMouseMotionListener(this);
addComponentListener(new ComponentAdapter() {
public void componentResized(ComponentEvent e) {
if(getWidth() <= 0 || getHeight() <= 0) return;
createOffscreenImage();
}
});
}
void createOffscreenImage() {
d=getSize();
if(img == null || imgsize == null || imgsize.width != d.width || imgsize.height != d.height) {
img=createImage(d.width, d.height);
gr=img.getGraphics();
imgsize=d;
}
}
/* ---------------------- MouseMotionListener interface------------------------- */
public void mouseMoved(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
int x=e.getX(), y=e.getY();
DrawCommand comm=new DrawCommand(DrawCommand.DRAW, x, y,
draw_color.getRed(), draw_color.getGreen(), draw_color.getBlue());
if(no_channel) {
drawPoint(comm);
return;
}
try {
byte[] buf=Util.streamableToByteBuffer(comm);
data_channel.send(new Message(null, null, buf));
Thread.yield(); // gives the repainter some breath
}
catch(Exception ex) {
System.err.println(ex);
}
}
/* ------------------- End of MouseMotionListener interface --------------------- */
/**
* Adds pixel to queue and calls repaint() whenever we have MAX_ITEMS pixels in the queue
* or when MAX_TIME msecs have elapsed (whichever comes first). The advantage compared to just calling
* repaint() after adding a pixel to the queue is that repaint() can most often draw multiple points
* at the same time.
*/
public void drawPoint(DrawCommand c) {
if(c == null) return;
gr.setColor(new Color(c.r, c.g, c.b));
gr.fillOval(c.x, c.y, 10, 10);
repaint();
}
public void clear() {
gr.clearRect(0, 0, getSize().width, getSize().height);
repaint();
}
public Dimension getPreferredSize() {
return preferred_size;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if(img != null) {
g.drawImage(img, 0, 0, null);
}
}
}
class ControlReceiver extends ExtendedReceiverAdapter {
public void viewAccepted(View v) {
member_size=v.size();
if(mainFrame != null)
mainFrame.setTitle(member_size + " mbrs");
data_channel.down(new Event(Event.VIEW_CHANGE, v));
}
}
class DataReceiver extends ExtendedReceiverAdapter implements ChannelListener {
public void receive(Message msg) {
byte[] buf=msg.getRawBuffer();
DrawCommand comm=null;
try {
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("***** Draw2Channels.run(): received invalid draw command " + comm.mode);
break;
}
}
catch(Exception ex) {
ex.printStackTrace();
}
}
public void viewAccepted(View v) {
System.out.println("** View=" + v);
member_size=v.size();
if(mainFrame != null)
setTitle();
}
public void channelConnected(Channel channel) {
}
public void channelDisconnected(Channel channel) {
}
public void channelClosed(Channel channel) {
}
public void channelShunned() {
System.out.println("received EXIT, waiting for ChannelReconnected callback");
}
public void channelReconnected(Address addr) {
}
}
}