org.jgroups.demos.wb.Whiteboard Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
package org.jgroups.demos.wb;
import org.jgroups.*;
import org.jgroups.blocks.*;
import org.jgroups.logging.Log;
import org.jgroups.logging.LogFactory;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.io.InputStream;
import java.io.OutputStream;
/**
* 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 MessageListener, MembershipListener, ActionListener, 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 void getState(OutputStream ostream) throws Exception {
panel.getState(ostream);
}
public void setState(InputStream istream) throws Exception {
panel.setState(istream);
}
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 Class[] {Object.class});
disp.callRemoteMethods(null, call, new RequestOptions(ResponseMode.GET_ALL, 5000));
} 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 unblock() {
}
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) {
}
}