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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\Subscribe; |
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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 Psr\Log\LoggerInterface; |
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use Superbalist\PubSub\Redis\RedisPubSubAdapter; |
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class PredisSubscribeCommandQueue implements SubscribeCommandQueue |
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{ |
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/** |
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* @var RedisPubSubAdapter |
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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 callable[] |
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*/ |
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private $handlers = []; |
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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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* @var bool |
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*/ |
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private $subscribed = false; |
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/** |
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* @param RedisPubSubAdapter $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( |
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RedisPubSubAdapter $client, |
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Serializer $serializer, |
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LoggerInterface $logger, |
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$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 $command) |
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{ |
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$massage = $this->serializer->serialize($command); |
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$this->client->publish($this->queue_name, $massage); |
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return true; |
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} |
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/** |
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* Subscribe on command queue. |
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* |
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* @param callable $handler |
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*/ |
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public function subscribe(callable $handler) |
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{ |
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$this->handlers[] = $handler; |
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// laze subscribe |
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if (!$this->subscribed) { |
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$this->client->subscribe($this->queue_name, function ($message) { |
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$this->handle($message); |
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}); |
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$this->subscribed = true; |
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} |
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} |
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/** |
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* Unsubscribe on command queue. |
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* |
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* @param callable $handler |
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* |
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* @return bool |
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*/ |
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public function unsubscribe(callable $handler) |
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{ |
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$index = array_search($handler, $this->handlers); |
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if ($index === false) { |
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return false; |
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} |
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unset($this->handlers[$index]); |
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return true; |
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} |
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/** |
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* @param mixed $message |
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*/ |
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private function handle($message) |
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{ |
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try { |
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$command = $this->serializer->deserialize($message); |
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} catch (\Exception $e) { // catch only deserialize exception |
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// it's a critical error |
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// it is necessary to react quickly to it |
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$this->logger->critical('Failed denormalize a command in the Redis queue', [$message, $e->getMessage()]); |
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// try denormalize in later |
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$this->client->publish($this->queue_name, $message); |
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return; // no command for handle |
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} |
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foreach ($this->handlers as $handler) { |
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call_user_func($handler, $command); |
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} |
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} |
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} |
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gpslab /
cqrs
