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<?php |
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namespace Saxulum\MessageQueue\SystemV; |
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use Saxulum\MessageQueue\AbstractMessageReceive; |
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use Saxulum\MessageQueue\MessageInterface; |
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use Saxulum\MessageQueue\MessageReceiveException; |
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final class SystemVReceive extends AbstractMessageReceive |
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{ |
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/** |
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* @var string |
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*/ |
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private $messageClass; |
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/** |
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* @var resource |
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*/ |
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private $queue; |
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/** |
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* @var int |
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*/ |
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private $type; |
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/** |
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* @var int |
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*/ |
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private $maxBytesPerMessage; |
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/** |
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* @param string $messageClass |
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* @param int $key |
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* @param int $type |
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* @param int $qbytes |
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*/ |
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public function __construct(string $messageClass, int $key, int $type = 1, int $qbytes = 16384) |
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{ |
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$this->messageClass = $messageClass; |
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$this->queue = msg_get_queue($key); |
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$this->type = $type; |
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$this->maxBytesPerMessage = $qbytes / 2; |
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msg_set_queue($this->queue, ['msg_qbytes' => $qbytes]); |
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} |
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/** |
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* @return null|MessageInterface |
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* |
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* @throws MessageReceiveException |
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*/ |
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public function receive() |
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{ |
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$type = null; |
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$json = null; |
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$errorCode = null; |
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$status = msg_receive( |
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$this->queue, |
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$this->type, |
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$type, |
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$this->maxBytesPerMessage, |
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$json, |
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false, |
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MSG_IPC_NOWAIT, |
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$errorCode |
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); |
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if (false === $status) { |
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// we do not wait for a message (prevent lock) |
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if (MSG_ENOMSG === $errorCode) { |
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return null; |
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} |
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throw new MessageReceiveException( |
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sprintf( |
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MessageReceiveException::MESSAGE_RECEIVE_FAILED, |
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sprintf(' (SystemV error code %d)', $errorCode) |
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), |
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MessageReceiveException::CODE_RECEIVE_FAILED |
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); |
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} |
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/** @var MessageInterface $messageClass */ |
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$messageClass = $this->messageClass; |
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return $messageClass::fromJson($json); |
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} |
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} |
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saxulum /
saxulum-message-queue
