/**
* Start consumer
*
* @param int $msgAmount
* @throws Exception\QueueException
*/
public function consume(int $msgAmount = 0)
{
Assertion::min($msgAmount, 0);
$this->target = $msgAmount;
$this->blockSize = $this->queue->getChannel()->getPrefetchCount();
if (!$this->timestampLastAck) {
$this->timestampLastAck = microtime(true);
}
$callback = function (Envelope $envelope) {
try {
$processFlag = $this->handleDelivery($envelope, $this->queue);
} catch (\Throwable $e) {
$this->logger->error('Exception during handleDelivery: ' . $e->getMessage());
$this->handleException($e);
$processFlag = DeliveryResult::MSG_REJECT_REQUEUE();
}
$this->handleProcessFlag($envelope, $processFlag);
$now = microtime(true);
if ($this->countMessagesUnacked > 0 && ($this->countMessagesUnacked === $this->blockSize || $now - $this->timestampLastAck > $this->idleTimeout)) {
$this->ackOrNackBlock();
}
if ($this->usePcntlSignalDispatch) {
// Check for signals
pcntl_signal_dispatch();
}
if (!$this->keepAlive || 0 !== $this->target && $this->countMessagesConsumed >= $this->target) {
$this->ackOrNackBlock();
$this->queue->cancel($this->consumerTag);
$this->shutdown();
return false;
}
};
try {
$this->queue->consume($callback, Constants::AMQP_NOPARAM, $this->consumerTag);
} catch (Exception\QueueException $e) {
$this->logger->error('Exception: ' . $e->getMessage());
$this->ackOrNackBlock();
// hack for different drivers
$channel = $this->queue->getChannel();
if ($channel instanceof Driver\PhpAmqpLib\Channel) {
$channel->getResource()->close();
// preferred, but not present in amqp-extension
} elseif ($channel instanceof Driver\AmqpExtension\Channel) {
$channel->getConnection()->reconnect();
// needed in order to destroy (and close) the channel
}
}
}
