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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Command\Queue\Pull; |
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use GpsLab\Component\Command\Command; |
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use GpsLab\Component\Command\Queue\Serializer\Serializer; |
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use Predis\Client; |
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use Psr\Log\LoggerInterface; |
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class PredisUniquePullCommandQueue implements PullCommandQueue |
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{ |
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/** |
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* @var Client |
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*/ |
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private $client; |
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/** |
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* @var Serializer |
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*/ |
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private $serializer; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* @var string |
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*/ |
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private $queue_name = ''; |
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/** |
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* @param Client $client |
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* @param Serializer $serializer |
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* @param LoggerInterface $logger |
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* @param string $queue_name |
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*/ |
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public function __construct(Client $client, Serializer $serializer, LoggerInterface $logger, $queue_name) |
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{ |
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$this->client = $client; |
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$this->serializer = $serializer; |
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$this->logger = $logger; |
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$this->queue_name = $queue_name; |
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} |
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/** |
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* Publish command to queue. |
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* |
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* @param Command $command |
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* |
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* @return bool |
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*/ |
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public function publish(Command $command) |
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{ |
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$value = $this->serializer->serialize($command); |
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// remove exists command and publish it again |
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$this->client->lrem($this->queue_name, 0, $value); |
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return (bool) $this->client->rpush($this->queue_name, [$value]); |
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} |
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/** |
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* Pop command from queue. Return NULL if queue is empty. |
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* |
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* @return Command|null |
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*/ |
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public function pull() |
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{ |
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$value = $this->client->lpop($this->queue_name); |
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if (!$value) { |
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return null; |
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} |
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try { |
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return $this->serializer->deserialize($value); |
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} catch (\Exception $e) { |
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// it's a critical error |
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// it is necessary to react quickly to it |
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$this->logger->critical('Failed denormalize a command in the Redis queue', [$value, $e->getMessage()]); |
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// try denormalize in later |
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$this->client->rpush($this->queue_name, [$value]); |
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return null; |
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} |
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} |
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} |
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gpslab /
cqrs
