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<?php |
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namespace Equip\Queue; |
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use Equip\Queue\Driver\DriverInterface; |
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use Equip\Queue\Handler\HandlerFactoryInterface; |
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use Equip\Queue\Serializer\JsonSerializer; |
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use Equip\Queue\Serializer\MessageSerializerInterface; |
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use Exception; |
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use Psr\Log\LoggerInterface; |
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class Worker |
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{ |
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/** |
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* @var DriverInterface |
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*/ |
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private $driver; |
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/** |
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* @var Event |
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*/ |
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private $event; |
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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 MessageSerializerInterface |
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*/ |
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private $serializer; |
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/** |
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* @var HandlerFactoryInterface |
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*/ |
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private $handlers; |
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/** |
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* @param DriverInterface $driver |
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* @param Event $event |
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* @param LoggerInterface $logger |
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* @param MessageSerializerInterface $serializer |
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* @param HandlerFactoryInterface $handlers |
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*/ |
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public function __construct( |
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DriverInterface $driver, |
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Event $event, |
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LoggerInterface $logger, |
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MessageSerializerInterface $serializer = null, |
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HandlerFactoryInterface $handlers |
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) { |
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$this->driver = $driver; |
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$this->event = $event; |
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$this->logger = $logger; |
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$this->serializer = $serializer ?: new JsonSerializer; |
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$this->handlers = $handlers; |
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} |
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/** |
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* Consumes messages off of the queue |
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* |
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* @param string $queue |
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*/ |
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public function consume($queue) |
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{ |
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while ($this->tick($queue)) { /* NOOP */ } |
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} |
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/** |
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* Handles fetching messages from the queue |
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* |
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* @param string $queue |
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* |
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* @return bool |
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*/ |
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protected function tick($queue) |
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{ |
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$packet = $this->driver->dequeue($queue); |
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if (empty($packet)) { |
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return true; |
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} |
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$message = $this->serializer->deserialize($packet); |
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try { |
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if ($this->invoke($message) === false) { |
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$this->jobShutdown($message); |
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return false; |
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} |
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} catch (Exception $exception) { |
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$this->jobException($message, $exception); |
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} |
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return true; |
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} |
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/** |
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* Invoke the messages handler |
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* |
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* @param Message $message |
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* |
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* @return null|bool |
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*/ |
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private function invoke(Message $message) |
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{ |
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$this->jobStart($message); |
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$result = call_user_func( |
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$this->handlers->get($message->handler()), |
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$message |
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); |
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$this->jobFinish($message); |
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return $result; |
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} |
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/** |
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* Handles actions related to a job starting |
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* |
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* @param Message $message |
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*/ |
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private function jobStart(Message $message) |
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{ |
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$this->event->acknowledge($message); |
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$this->logger->info(sprintf('`%s` job started', $message->handler())); |
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} |
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/** |
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* Handles actions related to a job finishing |
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* |
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* @param Message $message |
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*/ |
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private function jobFinish(Message $message) |
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{ |
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$this->event->finish($message); |
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$this->logger->info(sprintf('`%s` job finished', $message->handler())); |
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} |
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/** |
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* Handles actions related to a job shutting down the consumer |
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* |
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* @param Message $message |
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*/ |
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private function jobShutdown(Message $message) |
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{ |
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$this->logger->notice(sprintf('shutting down by request of `%s`', $message->handler())); |
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} |
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/** |
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* Handles actions related to job exceptions |
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* |
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* @param Message $message |
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* @param Exception $exception |
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*/ |
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private function jobException(Message $message, Exception $exception) |
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{ |
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$this->logger->error($exception->getMessage()); |
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$this->event->reject($message, $exception); |
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} |
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} |
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equip /
queue
