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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; |
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use GpsLab\Component\Command\Command; |
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use Predis\Client; |
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use Psr\Log\LoggerInterface; |
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use Symfony\Component\Serializer\SerializerInterface; |
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class PredisUniqueCommandQueue implements CommandQueue |
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{ |
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const LIST_KEY = 'unique_commands'; |
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const FORMAT = PredisCommandQueue::FORMAT; |
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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 SerializerInterface |
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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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* @param Client $client |
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* @param SerializerInterface $serializer |
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* @param LoggerInterface $logger |
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*/ |
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public function __construct(Client $client, SerializerInterface $serializer, LoggerInterface $logger) |
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{ |
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$this->client = $client; |
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$this->serializer = $serializer; |
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$this->logger = $logger; |
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} |
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/** |
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* Push 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 push(Command $command) |
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{ |
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$value = $this->serializer->serialize($command, self::FORMAT); |
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// remove exists command and push it again |
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$this->client->lrem(self::LIST_KEY, 0, $value); |
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return (bool) $this->client->rpush(self::LIST_KEY, [$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 pop() |
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{ |
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$value = $this->client->lpop(self::LIST_KEY); |
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if (!$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, Command::class, self::FORMAT); |
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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(self::LIST_KEY, [$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
