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<?php |
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namespace Zenstruck\Queue; |
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use SimpleBus\Asynchronous\Consumer\SerializedEnvelopeConsumer; |
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use SimpleBus\Message\Bus\MessageBus; |
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use Zenstruck\Queue\Event\FailedJob; |
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use Zenstruck\Queue\Event\MaxAttemptsReached; |
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use Zenstruck\Queue\Subscriber\ExitStrategy; |
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/** |
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* @author Kevin Bond <[email protected]> |
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*/ |
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final class Subscriber |
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{ |
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private $driver; |
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private $consumer; |
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private $eventBus; |
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public function __construct(Driver $driver, SerializedEnvelopeConsumer $consumer, MessageBus $eventBus = null) |
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{ |
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$this->driver = $driver; |
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$this->consumer = $consumer; |
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$this->eventBus = $eventBus; |
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} |
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/** |
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* @param ExitStrategy $exitStrategy |
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* @param callable|null $callback Callback that is called after job is consumed with args: count, job |
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* @param int|null $waitTime Time to wait before consuming another job |
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* @param int $maxAttempts The number of times to attempt a job before marking as failed, 0 for unlimited |
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* |
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* @return string |
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*/ |
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public function subscribe(ExitStrategy $exitStrategy, callable $callback = null, $waitTime = null, $maxAttempts = 50) |
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{ |
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$count = 0; |
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while (!$exitStrategy->shouldExit($count)) { |
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$job = $this->driver->pop(); |
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if ($job instanceof Job) { |
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$this->consume($job, $maxAttempts); |
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$this->executeCallback(++$count, $job, $callback); |
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} |
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if (null !== $waitTime) { |
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sleep($waitTime); |
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} |
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} |
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return $exitStrategy->getReason(); |
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} |
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/** |
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* @param int $count |
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* @param Job $job |
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* @param callable|int $callback |
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*/ |
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private function executeCallback($count, Job $job, callable $callback = null) |
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{ |
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if (!is_callable($callback)) { |
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return; |
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} |
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$callback($count, $job); |
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} |
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/** |
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* @param Job $job |
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* @param int $maxAttempts |
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*/ |
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private function consume(Job $job, $maxAttempts) |
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{ |
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try { |
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$this->consumer->consume($job->serializedEnvelope()); |
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$this->driver->delete($job); |
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} catch (\Exception $exception) { |
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$job->fail($exception); |
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$this->handleFailedJob($job, $maxAttempts); |
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} |
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} |
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/** |
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* @param Job $job |
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* @param int $maxAttempts |
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*/ |
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private function handleFailedJob(Job $job, $maxAttempts) |
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{ |
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$this->handleEvent(new FailedJob($job)); |
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if (0 !== $maxAttempts && $job->attempts() >= $maxAttempts) { |
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$this->handleEvent(new MaxAttemptsReached($job, $maxAttempts)); |
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$this->driver->delete($job); |
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return; |
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} |
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$this->driver->release($job); |
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} |
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/** |
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* @param object $event |
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*/ |
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private function handleEvent($event) |
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{ |
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if (!$this->eventBus instanceof MessageBus) { |
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return; |
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} |
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$this->eventBus->handle($event); |
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} |
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} |
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kbond /
php-queue
