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org.jgroups.demos.StompChat Maven / Gradle / Ivy
package org.jgroups.demos;
import org.jgroups.client.StompConnection;
import org.jgroups.util.Util;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
/**
* Chat client using STOMP to talk to other clients
*/
public class StompChat implements StompConnection.Listener {
JFrame mainFrame;
TextArea txtArea;
JTextField txtField;
final JLabel csLabel=new JLabel("Send: "), status=new JLabel("");
JButton leaveButton;
JButton sendButton;
JButton clearButton;
final JLabel cluster=new JLabel("Cluster: "), users_label=new JLabel("Users: ");
private int num_servers=1;
private int num_clients=0;
protected String username=null;
protected final Set users=new HashSet<>();
private final List servers=new ArrayList<>();
private final Set clients=new HashSet<>();
protected StompConnection stomp_client;
// ======================== reserved topic ==========================
public static final String MESSAGES = "/messages"; // headers + body
public static final String CLIENT_JOINED = "/client-joined"; // client: 1234-2532-2665
public static final String CLIENT_LEFT = "/client-left"; // client: 1432-7263-1002
public static final String CLIENTS = "/clients"; // clients: 355352,3343,2232
public static final String USER_JOINED = "/user-joined"; // user: Bela
public static final String USER_LEFT = "/user-left"; // user: Bela
public static final String GET_USERS = "/get-users"; //
public static final String USERS = "/users"; // users: Bela, Michelle
// reserved keywords in INFO messages
public static final String ENDPOINTS = "endpoints";
public static final String VIEW = "view";
public static final String CLIENTS_KW = "clients";
public static final String DESTINATION = "destination";
public static final String USER = "user";
public static final String USERS_KW = "users";
public static final String CLIENT = "client";
public StompChat(String host, int port, String user) {
stomp_client=new StompConnection(host + ":" + port);
stomp_client.addListener(this);
username=user;
try {
if(username == null)
username=System.getProperty("user.name");
}
catch(Throwable t) {
}
}
public static void main(String[] args) throws Exception {
String host="localhost";
int port=8787;
String user=null;
for(int i=0; i < args.length; i++) {
if(args[i].equals("-host") || args[i].equals("-h")) {
host=args[++i];
continue;
}
if(args[i].equals("-port") || args[i].equals("-p")) {
port=Integer.parseInt(args[++i]);
continue;
}
if(args[i].equals("-user") || args[i].equals("-name")) {
user=args[++i];
continue;
}
help();
return;
}
StompChat instance=new StompChat(host, port, user);
instance.start();
}
void showMessage(String msg) {
txtArea.append(msg + "\n");
}
void userJoined(String name) {
users.add(name);
showStatus(name + " joined the chat");
users_label.setText("Users: " + users);
}
void userLeft(String name) {
users.remove(name);
showStatus(name + " left the chat");
users_label.setText("Users: " + users);
}
void newView(String view) {
cluster.setText("Cluster: " + view);
}
void usersReceived(Collection users) {
this.users.addAll(users);
users_label.setText("Users: " + this.users);
}
static void help() {
System.out.println("Chat [-help] [-host ] [-port ] [-user ]");
}
public void start() throws Exception {
mainFrame=new JFrame("Chat demo");
mainFrame.setPreferredSize(new Dimension(600,600));
mainFrame.setBackground(Color.white);
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
stomp_client.send(USER_LEFT, USER, username);
stomp_client.send(CLIENT_LEFT, CLIENT, username);
stomp_client.disconnect();
System.exit(0);
}
});
connect();
Box main_box=Box.createVerticalBox();
main_box.setBackground(Color.white);
Box input=Box.createHorizontalBox(); // input field
Box buttons=Box.createHorizontalBox(); // for all the buttons
mainFrame.add(main_box);
main_box.add(Box.createVerticalStrut(10));
main_box.add(cluster);
cluster.setAlignmentX(Component.LEFT_ALIGNMENT);
main_box.add(Box.createVerticalStrut(10));
main_box.add(Box.createVerticalStrut(10));
main_box.add(users_label);
main_box.add(Box.createVerticalStrut(10));
txtArea=new TextArea();
txtArea.setPreferredSize(new Dimension(550, 500));
txtArea.setEditable(false);
txtArea.setBackground(Color.white);
main_box.add(txtArea);
main_box.add(Box.createVerticalStrut(10));
main_box.add(input);
main_box.add(Box.createVerticalStrut(10));
main_box.add(buttons);
csLabel.setPreferredSize(new Dimension(85, 30));
input.add(csLabel);
txtField=new JTextField();
txtField.setPreferredSize(new Dimension(200, 30));
txtField.setBackground(Color.white);
input.add(txtField);
leaveButton=new JButton("Leave");
leaveButton.setPreferredSize(new Dimension(150, 30));
buttons.add(leaveButton);
leaveButton.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
stomp_client.send(USER_LEFT, USER, username);
stomp_client.send(CLIENT_LEFT, CLIENT, username);
stomp_client.disconnect();
System.exit(0);
}
});
sendButton=new JButton("Send");
sendButton.setPreferredSize(new Dimension(150, 30));
buttons.add(sendButton);
sendButton.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
send(txtField.getText());
txtField.selectAll();
}
});
clearButton=new JButton("Clear");
clearButton.setPreferredSize(new Dimension(150, 30));
clearButton.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
txtArea.setText("");
}
});
buttons.add(clearButton);
status.setForeground(Color.red);
main_box.add(status);
mainFrame.pack();
mainFrame.setLocation(15, 25);
Dimension main_frame_size=mainFrame.getSize();
txtArea.setPreferredSize(new Dimension((int)(main_frame_size.width * 0.9), (int)(main_frame_size.height * 0.8)));
mainFrame.setVisible(true);
txtField.setFocusable(true);
txtField.requestFocusInWindow();
txtField.setToolTipText("type and then press enter to send");
txtField.addActionListener(e -> {
String cmd=e.getActionCommand();
if(cmd != null && !cmd.isEmpty()) {
send(txtField.getText());
txtField.selectAll();
}
});
sendGetUsers();
}
protected void connect() throws Exception {
stomp_client.connect();
stomp_client.send(USER_JOINED, USER, username);
stomp_client.subscribe(MESSAGES);
stomp_client.subscribe(CLIENT_JOINED);
stomp_client.subscribe(CLIENT_LEFT);
stomp_client.subscribe(CLIENTS);
stomp_client.subscribe(USER_JOINED);
stomp_client.subscribe(USER_LEFT);
stomp_client.subscribe(GET_USERS);
stomp_client.subscribe(USERS);
stomp_client.send(CLIENT_JOINED, CLIENT, username);
stomp_client.send(USER_JOINED, USER, username);
}
protected void send(String msg) {
try {
String tmp=username + ": " + msg;
byte[] buf=tmp.getBytes();
stomp_client.send(MESSAGES, buf, 0, buf.length);
}
catch(Exception e) {
System.err.println("Failed sending message: " + e);
}
}
public void sendGetUsers() {
stomp_client.send(GET_USERS);
}
protected void showStatus(final String msg) {
new Thread(() -> {
synchronized(status) {
status.setText(msg);
Util.sleep(2000);
status.setText("");
}
}).start();
}
public void onInfo(Map information) {
String view=information.get("view");
Collection list;
if(view != null) {
list=Util.parseCommaDelimitedStrings(view);
if(list != null) {
num_servers=list.size();
if(mainFrame != null)
setTitle();
servers.clear();
servers.addAll(list);
newView(view);
}
else {
String targets=information.get(ENDPOINTS);
if(targets != null) {
list=Util.parseCommaDelimitedStrings(targets);
if(list != null) {
num_servers=list.size();
if(mainFrame != null)
setTitle();
servers.clear();
servers.addAll(list);
}
}
}
}
}
public void onMessage(Map headers, byte[] buf, int offset, int length) {
String destination=headers.get(DESTINATION);
if(destination == null)
return;
if(destination.equals(MESSAGES)) {
showMessage(new String(buf, offset, length));
return;
}
if(destination.equals(CLIENT_JOINED)) {
String new_client=headers.get(CLIENT);
if(new_client != null) {
synchronized(clients) {
if(clients.add(new_client)) {
num_clients=clients.size();
setTitle();
}
}
stomp_client.send(CLIENTS, null, 0, 0, CLIENTS_KW, getAllClients());
}
return;
}
if(destination.equals(CLIENT_LEFT)) {
String left_client=headers.get(CLIENT);
if(left_client != null) {
synchronized(clients) {
if(clients.remove(left_client)) {
num_clients=clients.size();
setTitle();
}
}
}
return;
}
if(destination.equals(CLIENTS)) {
String all_clients=headers.get(CLIENTS_KW);
if(all_clients != null) {
List list=Util.parseCommaDelimitedStrings(all_clients);
if(list != null) {
synchronized(clients) {
if(clients.addAll(list)) {
num_clients=clients.size();
setTitle();
}
}
}
}
return;
}
if(destination.equals(USER_JOINED)) {
String name=headers.get(USER);
if(name != null)
userJoined(name);
return;
}
if(destination.equals(USER_LEFT)) {
String name=headers.get(USER);
if(name != null)
userLeft(name);
return;
}
if(destination.equals(GET_USERS)) {
stomp_client.send(USERS, USERS_KW, usersToStr());
return;
}
if(destination.equals(USERS)) {
String tmp=headers.get(USERS_KW);
if(tmp != null) {
List list=Util.parseCommaDelimitedStrings(tmp);
if(list != null)
usersReceived(list);
}
}
}
private String usersToStr() {
StringBuilder sb=new StringBuilder();
boolean first=true;
for(String user: users) {
if(first)
first=false;
else
sb.append(",");
sb.append(user);
}
return sb.toString();
}
void setTitle() {
if(mainFrame != null)
mainFrame.setTitle(num_servers + " server(s), " + num_clients + " client(s)");
}
int getNumberOfClients() {
synchronized(clients) {
return clients.size();
}
}
String getAllClients() {
StringBuilder sb=new StringBuilder();
boolean first=true;
for(String client: clients) {
if(first)
first=false;
else
sb.append(",");
sb.append(client);
}
return sb.toString();
}
}
