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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\Domain\Event\Queue\Subscribe; |
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use GpsLab\Domain\Event\Event; |
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use GpsLab\Domain\Event\Queue\Serializer\Serializer; |
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use PhpAmqpLib\Channel\AMQPChannel; |
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use PhpAmqpLib\Message\AMQPMessage; |
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use Psr\Log\LoggerInterface; |
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class AMQPSubscribeEventQueue implements SubscribeEventQueue |
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{ |
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/** |
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* @var AMQPChannel |
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*/ |
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private $channel; |
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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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* @var bool |
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*/ |
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private $declared = false; |
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/** |
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* @param AMQPChannel $channel |
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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(AMQPChannel $channel, Serializer $serializer, LoggerInterface $logger, $queue_name) |
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{ |
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$this->channel = $channel; |
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$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 event to queue. |
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* |
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* @param Event $event |
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* |
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* @return bool |
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*/ |
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public function publish(Event $event) |
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{ |
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$message = $this->serializer->serialize($event); |
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$this->declareQueue(); |
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$this->channel->basic_publish(new AMQPMessage($message), '', $this->queue_name); |
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return true; |
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} |
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/** |
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* Subscribe on event queue. |
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* |
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* @throws \ErrorException |
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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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$this->declareQueue(); |
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$this->channel->basic_consume( |
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$this->queue_name, |
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'', |
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false, |
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true, |
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false, |
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false, |
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function (AMQPMessage $message) { |
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$this->handle($message->body); |
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} |
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); |
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$this->subscribed = true; |
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} |
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while ($this->channel->is_consuming()) { |
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$this->channel->wait(); |
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} |
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} |
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/** |
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* Unsubscribe on event 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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View Code Duplication |
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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private function declareQueue() |
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{ |
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// laze declare queue |
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if (!$this->declared) { |
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$this->channel->queue_declare($this->queue_name, false, false, false, false); |
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$this->declared = true; |
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} |
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} |
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/** |
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* @param string $message |
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*/ |
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3 |
View Code Duplication |
private function handle($message) |
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{ |
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try { |
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$event = $this->serializer->deserialize($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 event in the AMQP queue', [$message, $e->getMessage()]); |
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// try denormalize in later |
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$this->declareQueue(); |
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$this->channel->basic_publish(new AMQPMessage($message), '', $this->queue_name); |
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return; // no event for handle |
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} |
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foreach ($this->handlers as $handler) { |
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call_user_func($handler, $event); |
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} |
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} |
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} |
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gpslab /
domain-event
