Request-reply broker in Scala

/*
* Simple request-reply broker
*
* @author Giovanni Ruggiero
* @email moc.liamg|oreiggur.innavoig#moc.liamg|oreiggur.innavoig
*
*/

import org.zeromq.ZMQ

object rrbroker {
def main(args : Array[String]) {
// Prepare our context and sockets
val context = ZMQ.context(1)

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

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

// Initialize poll set
val items = context.poller(2)
items.register(frontend, 1)
items.register(backend, 1)

var more = false

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

if (items.pollin(0)) {
do {
// receive message
val message = frontend.recv(0)
more = frontend.hasReceiveMore

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