bboss.org.jgroups.demos.wb.Whiteboard Maven / Gradle / Ivy
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// $Id: Whiteboard.java,v 1.9 2009/05/13 13:07:07 belaban Exp $
package bboss.org.jgroups.demos.wb;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import bboss.org.jgroups.Address;
import bboss.org.jgroups.Channel;
import bboss.org.jgroups.JChannel;
import bboss.org.jgroups.MembershipListener;
import bboss.org.jgroups.Message;
import bboss.org.jgroups.MessageListener;
import bboss.org.jgroups.View;
import bboss.org.jgroups.blocks.GroupRequest;
import bboss.org.jgroups.blocks.MethodCall;
import bboss.org.jgroups.blocks.RpcDispatcher;
import bboss.org.jgroups.logging.Log;
import bboss.org.jgroups.logging.LogFactory;
/**
* Shared whiteboard: members are represented by rectangles that contain their names and the OS/arch of
* the machine they are working on. The boxes can be moved by anyone and by clicking on them, messages can
* be sent to specific or all members. Whiteboard is both an application and an applet.
* @author Bela Ban
*/
public class Whiteboard extends Applet implements ActionListener, MessageListener, MembershipListener,
ComponentListener, FocusListener {
public RpcDispatcher disp;
Channel channel;
GraphPanel panel;
private Button leave_button;
private Label mbr_label;
private final Font default_font=new Font("Helvetica",Font.PLAIN,12);
private String props=null;
public static final String groupname="WbGrp";
private boolean application=false;
Log log=LogFactory.getLog(getClass());
public void receive(Message m) {
;
}
public byte[] getState() {
panel.saveState();
return panel.getState();
}
public void setState(byte[] new_state) {
panel.setState(new_state);
}
private String getInfo() {
StringBuilder ret = new StringBuilder();
ret.append(" (" + System.getProperty("os.name") + ' ' + System.getProperty("os.version") +
' ' + System.getProperty("os.arch") + ')');
return ret.toString();
}
private Frame findParent() {
Component retval = getParent();
while (retval != null) {
if (retval instanceof Frame)
return (Frame) retval;
retval = retval.getParent();
}
return null;
}
public Whiteboard() { // called when started as applet
}
public Whiteboard(String properties) { // called when started as application
application = true;
props = properties;
}
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
panel.setBackground(Color.white);
add("Center", panel);
Panel p = new Panel();
leave_button = new Button("Exit");
leave_button.setFont(default_font);
leave_button.addActionListener(this);
mbr_label = new Label("1 mbr(s)");
mbr_label.setFont(default_font);
p.add("South", leave_button);
p.add("South", mbr_label);
add("South", p);
if (!application)
props = getParameter("properties");
if (props == null) {
props = "udp.xml";
}
System.out.println("properties are " + props);
try {
channel = new JChannel(props);
disp = new RpcDispatcher(channel, this, this, this);
channel.connect(groupname);
channel.getState(null, 0);
} catch (Exception e) {
log.error("Whiteboard.init(): " + e);
}
panel.my_addr = channel.getAddress();
UserInfoDialog dlg = new UserInfoDialog(findParent());
String n = dlg.getUserName();
String info = getInfo();
panel.start(n + info);
addComponentListener(this);
addFocusListener(this);
}
public void destroy() {
if (disp != null) {
try {
MethodCall call = new MethodCall("removeNode", new Object[] {panel.my_addr}, new String[] {Object.class.getName()});
disp.callRemoteMethods(null, call, GroupRequest.GET_ALL, 0);
} catch (Exception e) {
log.error(e.toString());
}
channel.close();
disp = null;
if (panel != null) {
panel.stop();
panel = null;
}
}
}
public void repaint() {
if (panel != null)
panel.repaint();
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if ("Exit".equals(command)) {
try {
setVisible(false);
destroy();
if (application) {
((Frame) getParent()).dispose();
System.exit(0);
}
} catch (Exception ex) {
log.error(ex.toString());
}
} else
System.out.println("Unknown action");
}
public void viewAccepted(View v) {
if (v != null) {
if (mbr_label != null)
mbr_label.setText(v.size() + " mbr(s)");
}
panel.adjustNodes(v.getMembers());
}
public void suspect(Address obj) {
}
public void block() {
}
public void moveNode(Node n) {
panel.moveNode(n);
}
public void addNode(String lbl, Address addr, int xloc, int yloc) {
panel.addNode(lbl, addr, xloc, yloc);
}
public void removeNode(Object addr) {
panel.removeNode(addr);
}
public void displayMessage(String sender, String msg) {
new MessageDialog(findParent(), sender, msg);
panel.repaint();
}
public void componentResized(ComponentEvent e) {
if (panel != null) panel.repaint();
}
public void componentMoved(ComponentEvent e) {
}
public void componentShown(ComponentEvent e) {
if (panel != null) panel.repaint();
}
public void componentHidden(ComponentEvent e) {
}
public void focusGained(FocusEvent e) {
if (panel != null) panel.repaint();
}
public void focusLost(FocusEvent e) {
}
public static void main(String[] args) {
String props = null;
for (int i = 0; i < args.length; i++) {
if ("-props".equals(args[i])) {
props = args[++i];
continue;
}
help();
return;
}
Whiteboard wb = new Whiteboard(props);
new ApplFrame("Whiteboard Application", wb);
}
static void help() {
System.out.println("Whiteboard [-help] [-props ]");
}
}
class ApplFrame extends Frame implements WindowListener, ComponentListener {
Whiteboard wb = null;
public ApplFrame(String title, Whiteboard wb) {
super(title);
this.wb = wb;
add(wb);
setSize(299, 299);
setVisible(true);
wb.init();
setSize(300, 300);
addWindowListener(this);
addComponentListener(this);
}
public void windowOpened(WindowEvent e) {
}
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
}
public void windowClosed(WindowEvent e) {
}
public void windowIconified(WindowEvent e) {
}
public void windowDeiconified(WindowEvent e) {
wb.repaint();
}
public void windowActivated(WindowEvent e) {
wb.repaint();
}
public void windowDeactivated(WindowEvent e) {
}
public void componentResized(ComponentEvent e) {
wb.repaint();
}
public void componentMoved(ComponentEvent e) {
}
public void componentShown(ComponentEvent e) {
}
public void componentHidden(ComponentEvent e) {
}
}
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