<?php
/*
 *  Reading from multiple sockets
 *  This version uses a simple recv loop
 * @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
 */

//  Prepare our context and sockets
$context = new ZMQContext();

//  Connect to task ventilator
$receiver = new ZMQSocket($context, ZMQ::SOCKET_PULL);
$receiver->connect("tcp://localhost:5557");

//  Connect to weather server
$subscriber = new ZMQSocket($context, ZMQ::SOCKET_SUB);
$subscriber->connect("tcp://localhost:5556");
$subscriber->setSockOpt(ZMQ::SOCKOPT_SUBSCRIBE, "10001");

//  Process messages from both sockets
//  We prioritize traffic from the task ventilator
while (true) {
    //  Process any waiting tasks
    try {
        for ($rc = 0; !$rc;) {
            if ($rc = $receiver->recv(ZMQ::MODE_NOBLOCK)) {
                // process task
            }
        }
    } catch (ZMQSocketException $e) {
        // do nothing
    }

    try {
        //  Process any waiting weather updates
        for ($rc = 0; !$rc;) {
            if ($rc = $subscriber->recv(ZMQ::MODE_NOBLOCK)) {
                // process weather update
            }
        }
    } catch (ZMQSocketException $e) {
        // do nothing
    }

    //  No activity, so sleep for 1 msec
    usleep(1);
}
