org.jgroups.demos.Chat 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).

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package org.jgroups.demos;

import org.jgroups.JChannel;
import org.jgroups.Message;
import org.jgroups.ReceiverAdapter;
import org.jgroups.View;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Chat extends ReceiverAdapter {
    protected JChannel channel;
    protected static final String CLUSTER="chat";

    public void viewAccepted(View new_view) {
        System.out.println("** view: " + new_view);
    }

    public void receive(Message msg) {
        String line="[" + msg.getSrc() + "]: " + msg.getObject();
        System.out.println(line);
    }

    /** Method called from other app, injecting channel */
    public void start(JChannel ch) throws Exception {
        channel=ch;
        channel.setReceiver(this);
        channel.connect(CLUSTER);
        eventLoop();
        channel.close();
    }

    private void start(String props, String name, boolean nohup) throws Exception {
        channel=new JChannel(props);
        if(name != null)
            channel.name(name);
        channel.setReceiver(this);
        channel.connect(CLUSTER);
        if(!nohup) {
            eventLoop();
            channel.close();
        }
    }

    private void eventLoop() {
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
        while(true) {
            try {
                System.out.print("> "); System.out.flush();
                String line=in.readLine().toLowerCase();
                if(line.startsWith("quit") || line.startsWith("exit")) {
                    break;
                }
                Message msg=new Message(null, line);
                channel.send(msg);
            }
            catch(Exception ignored) {
            }
        }
    }


    public static void main(String[] args) throws Exception {
        String  props="udp.xml";
        String  name=null;
        boolean nohup=false;

        for(int i=0; i < args.length; i++) {
            if(args[i].equals("-props")) {
                props=args[++i];
                continue;
            }
            if(args[i].equals("-name")) {
                name=args[++i];
                continue;
            }
            if(args[i].equals("-nohup")) {
                nohup=true;
                continue;
            }
            help();
            return;
        }

        new Chat().start(props, name, nohup);
    }

    protected static void help() {
        System.out.println("Chat [-props XML config] [-name name] [-nohup]");
    }
}