Freelance server, Model Three in Java

import org.zeromq.ZContext;
import org.zeromq.ZFrame;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Socket;
import org.zeromq.ZMsg;

// Freelance server - Model 3
// Uses an ROUTER/ROUTER socket but just one thread

public class flserver3
{
public static void main(String[] args)
{
boolean verbose = (args.length > 0 && args[0].equals("-v"));

ZContext ctx = new ZContext();
// Prepare server socket with predictable identity
String bindEndpoint = "tcp://*:5555";
String connectEndpoint = "tcp://localhost:5555";
Socket server = ctx.createSocket(ZMQ.ROUTER);
server.setIdentity(connectEndpoint.getBytes());
server.bind(bindEndpoint);
System.out.printf ("I: service is ready at %s\n", bindEndpoint);

while (!Thread.currentThread().isInterrupted()) {
ZMsg request = ZMsg.recvMsg(server);
if (verbose && request != null)
request.dump(System.out);

if (request == null)
break; // Interrupted

// Frame 0: identity of client
// Frame 1: PING, or client control frame
// Frame 2: request body
ZFrame identity = request.pop();
ZFrame control = request.pop();
ZMsg reply = new ZMsg();
if (control.equals("PING"))
reply.add("PONG");
else {
reply.add(control);
reply.add("OK");
}
request.destroy();
reply.push(identity);
if (verbose && reply != null)
reply.dump(System.out);
reply.send(server);
}
if (Thread.currentThread().isInterrupted())
System.out.printf ("W: interrupted\n");

ctx.destroy();
}
}