Request-reply broker in Java

import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Context;
import org.zeromq.ZMQ.Poller;
import org.zeromq.ZMQ.Socket;

/**

  • Simple request-reply broker

*
*/
public class rrbroker{

public static void main (String[] args) {
// Prepare our context and sockets
Context context = ZMQ.context(1);

Socket frontend = context.socket(ZMQ.ROUTER);
Socket backend = context.socket(ZMQ.DEALER);
frontend.bind("tcp://*:5559");
backend.bind("tcp://*:5560");

System.out.println("launch and connect broker.");

// Initialize poll set
Poller items = new Poller (2);
items.register(frontend, Poller.POLLIN);
items.register(backend, Poller.POLLIN);

boolean more = false;
byte[] message;

// Switch messages between sockets
while (!Thread.currentThread().isInterrupted()) {
// poll and memorize multipart detection
items.poll();

if (items.pollin(0)) {
while (true) {
// receive message
message = frontend.recv(0);
more = frontend.hasReceiveMore();

// Broker it
backend.send(message, more ? ZMQ.SNDMORE : 0);
if(!more){
break;
}
}
}
if (items.pollin(1)) {
while (true) {
// receive message
message = backend.recv(0);
more = backend.hasReceiveMore();
// Broker it
frontend.send(message, more ? ZMQ.SNDMORE : 0);
if(!more){
break;
}
}
}
}
// We never get here but clean up anyhow
frontend.close();
backend.close();
context.term();
}
}