/**
* Checks if workers are still valid.
*
* @param string $heartbeatAt
* @return mixed|string
*/
public function validateQueue($heartbeatAt)
{
if (microtime(true) > $heartbeatAt) {
$this->queue->rewind();
while ($this->queue->valid()) {
$message = new MultipartMessage($this->workerChannel);
$message->setBody("HEARTBEAT");
$message->wrap($this->queue->key(), null);
$message->send();
$this->queue->next();
}
$heartbeatAt = microtime(true) + $this->config->getInterval();
}
$this->queue->purgeQueue();
return $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);
}
}
