Binary Star server, using core class in Java

/*
* bstarsrv2.java
*
*/

import org.zeromq.ZContext;
import org.zeromq.ZLoop;
import org.zeromq.ZLoop.IZLoopHandler;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.PollItem;
import org.zeromq.ZMQ.Socket;
import org.zeromq.ZMsg;

// Binary Star server, using bstar reactor
public class bstarsrv2
{
private static IZLoopHandler Echo = new IZLoopHandler()
{
@Override
public int handle(ZLoop loop, PollItem item, Object arg)
{
ZMsg msg = ZMsg.recvMsg(item.getSocket());
msg.send(item.getSocket());
return 0;
}
};

public static void main(String[] argv) {
// Arguments can be either of:
// -p primary server, at tcp://localhost:5001
// -b backup server, at tcp://localhost:5002
bstar bs = null;

if (argv.length == 1 && argv[0].equals("-p")) {
System.out.printf("I: Primary active, waiting for backup (passive)\n");
bs = new bstar(true, "tcp://*:5003", "tcp://localhost:5004");
bs.voter ("tcp://*:5001", ZMQ.ROUTER, Echo, null);
}
else
if (argv.length == 1 && argv[0].equals("-b")) {
System.out.printf("I: Backup passive, waiting for primary (active)\n");
bs = new bstar(false, "tcp://*:5004", "tcp://localhost:5003");
bs.voter ("tcp://*:5002", ZMQ.ROUTER, Echo, null);
}
else {
System.out.printf("Usage: bstarsrv { -p | -b }\n");
System.exit(0);
}
bs.start();
bs.destroy();
}
}