/**
* 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);
}
}
}
/**
* @param WorkerInterface $worker
* @throws \Exception
*/
public function execute(WorkerInterface $worker)
{
// Ensure that the socket connections have been made.
if (!$this->workerProcess) {
throw new \Exception("Please run 'connect' before executing the worker!");
}
// Some initialization
$read = array();
$write = array();
$heartbeatAt = microtime(true) + $this->config->getInterval();
$poll = new ZMQPoll();
$poll->add($this->workerProcess, ZMQ::POLL_IN);
$liveness = $this->config->getLiveness();
$interval = $this->config->getInitInterval();
// Main loop
while (true) {
$events = $poll->poll($read, $write, $this->config->getInterval() * 1000);
if ($events) {
// Get message
// - 3-part envelope + content -> request
// - 1-part "HEARTBEAT" -> heartbeat
$message = new MultipartMessage($this->workerProcess);
$message->recv();
if ($message->parts() == 3) {
$this->logger->info("({$this->identity}) Responding To Message", array($message->body()));
$response = $worker->run($message->body());
$message->setBody($response);
$message->send();
$liveness = $this->config->getLiveness();
} elseif ($message->parts() == 1 && $message->body() == 'HEARTBEAT') {
$this->logger->info("({$this->identity}) Got heartbeat from server!");
$liveness = $this->config->getLiveness();
} else {
$this->logger->error("({$this->identity}) Invalid Message!", array($message->__toString()));
}
$interval = $this->config->getInitInterval();
} elseif (--$liveness == 0) {
$this->logger->warning("({$this->identity}) Heartbeat failure! Can't reach queue!");
$this->logger->warning("({$this->identity}) Reconnecting in {$this->config->getInterval()} seconds!");
usleep($this->config->getInterval() * 1000 * 1000);
if ($interval < $this->config->getMaxInterval()) {
$interval *= 2;
}
$this->connect($this->context);
$poll->clear();
$poll->add($this->workerProcess, ZMQ::POLL_IN);
$liveness = $this->config->getLiveness();
}
// Send a heartbeat
$heartbeatAt = $this->sendHeartbeat($heartbeatAt);
}
}
