/**
* Executes the broker
*
* @throws \Exception
*/
public function execute()
{
// Ensure that the socket connections have been made.
if (!$this->clientChannel || !$this->workerChannel) {
throw new \Exception("Please run 'connect' before executing the broker!");
}
// Some initialization
$read = array();
$write = array();
$heartbeatAt = microtime(true) + $this->config->getInterval();
// Main loop
while (true) {
$poll = new ZMQPoll();
$poll->add($this->workerChannel, ZMQ::POLL_IN);
// Poll the client channel only if we have available workers
if ($this->queue->size()) {
$poll->add($this->clientChannel, ZMQ::POLL_IN);
}
// Get all the events and if any events occurred process them.
$events = $poll->poll($read, $write, $this->config->getInterval() * 1000);
if ($events > 0) {
foreach ($read as $socket) {
$message = new MultipartMessage($socket);
$message->recv();
// Handle worker activity on backend
if ($socket === $this->workerChannel) {
$identity = $message->unwrap();
$this->handleMessage($message, $identity);
} else {
// Now get next client request, route to next worker
$identity = $this->queue->getWorker();
$message->wrap($identity);
$message->setSocket($this->workerChannel)->send();
}
}
$heartbeatAt = $this->validateQueue($heartbeatAt);
}
}
}
