Clone client, Model Four in Java

package guide;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import org.zeromq.SocketType;
import org.zeromq.ZContext;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Poller;
import org.zeromq.ZMQ.Socket;

/**
* Clone client Model Four
*
*/

public class clonecli4
{
// This client is identical to clonecli3 except for where we
// handles subtrees.
private final static String SUBTREE = "/client/";

private static Map<String, kvsimple> kvMap = new HashMap<String, kvsimple>();

public void run()
{
try (ZContext ctx = new ZContext()) {
Socket snapshot = ctx.createSocket(SocketType.DEALER);
snapshot.connect("tcp://localhost:5556");

Socket subscriber = ctx.createSocket(SocketType.SUB);
subscriber.connect("tcp://localhost:5557");
subscriber.subscribe(SUBTREE.getBytes(ZMQ.CHARSET));

Socket push = ctx.createSocket(SocketType.PUSH);
push.connect("tcp://localhost:5558");

// get state snapshot
snapshot.sendMore("ICANHAZ?");
snapshot.send(SUBTREE);
long sequence = 0;

while (true) {
kvsimple kvMsg = kvsimple.recv(snapshot);
if (kvMsg == null)
break; // Interrupted

sequence = kvMsg.getSequence();
if ("KTHXBAI".equalsIgnoreCase(kvMsg.getKey())) {
System.out.println(
"Received snapshot = " + kvMsg.getSequence()
);
break; // done
}

System.out.println("receiving " + kvMsg.getSequence());
clonecli4.kvMap.put(kvMsg.getKey(), kvMsg);
}

Poller poller = ctx.createPoller(1);
poller.register(subscriber);

Random random = new Random();

// now apply pending updates, discard out-of-getSequence messages
long alarm = System.currentTimeMillis() + 5000;
while (true) {
int rc = poller.poll(
Math.max(0, alarm - System.currentTimeMillis())
);
if (rc == -1)
break; // Context has been shut down

if (poller.pollin(0)) {
kvsimple kvMsg = kvsimple.recv(subscriber);
if (kvMsg == null)
break; // Interrupted
if (kvMsg.getSequence() > sequence) {
sequence = kvMsg.getSequence();
System.out.println("receiving " + sequence);
clonecli4.kvMap.put(kvMsg.getKey(), kvMsg);
}
}

if (System.currentTimeMillis() >= alarm) {
String key = String.format(
"%s%d", SUBTREE, random.nextInt(10000)
);
int body = random.nextInt(1000000);

ByteBuffer b = ByteBuffer.allocate(4);
b.asIntBuffer().put(body);

kvsimple kvUpdateMsg = new kvsimple(key, 0, b.array());
kvUpdateMsg.send(push);
alarm = System.currentTimeMillis() + 1000;
}
}
}
}

public static void main(String[] args)
{
new clonecli4().run();
}
}