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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 Exception; |
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use League\Tactician\CommandBus; |
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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 Queue |
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*/ |
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private $queue; |
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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 CommandBus |
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*/ |
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private $command_bus; |
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/** |
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* Will shutdown the worker on the next tick |
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* |
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* @var bool |
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*/ |
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private $shutdown = false; |
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/** |
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* Will shutdown the worker when the queue is drained |
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* |
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* @var bool |
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*/ |
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private $drain = false; |
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public function __construct( |
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DriverInterface $driver, |
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Queue $queue, |
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Event $event, |
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CommandBus $command_bus |
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) { |
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$this->driver = $driver; |
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$this->queue = $queue; |
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$this->event = $event; |
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$this->command_bus = $command_bus; |
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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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* @codeCoverageIgnore |
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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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$this->bindSignals(); |
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while ($this->tick($queue)) { |
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pcntl_signal_dispatch(); |
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} |
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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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if ($this->shutdown) { |
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$this->event->shutdown(); |
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return false; |
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} |
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$message = $this->driver->dequeue($queue); |
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if (empty($message) && $this->drain) { |
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$this->event->drained(); |
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return false; |
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} elseif (empty($message)) { |
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return true; |
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} |
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$command = unserialize($message); |
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try { |
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$this->event->acknowledge($command); |
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$this->command_bus->handle($command); |
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$this->event->finish($command); |
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} catch (Exception $exception) { |
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$this->queue->add(sprintf('%s-failed', $queue), $command); |
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$this->event->reject($command, $exception); |
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} |
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return true; |
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} |
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/** |
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* Handles binding POSIX signals appropriately |
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* |
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* @codeCoverageIgnore |
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*/ |
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private function bindSignals() |
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{ |
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// Shutdown the listener |
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array_map(function ($signal) { |
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pcntl_signal($signal, [$this, 'shutdown']); |
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}, [ |
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SIGTERM, |
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SIGINT, |
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SIGQUIT, |
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]); |
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// Drain the queue |
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pcntl_signal(SIGHUP, [$this, 'drain']); |
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} |
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/** |
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* Set the worker to shutdown on the next tick |
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*/ |
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1 |
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private function shutdown() |
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{ |
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1 |
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$this->shutdown = true; |
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1 |
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} |
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/** |
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* Set the worker to shutdown when the queue is drained |
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*/ |
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1 |
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private function drain() |
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{ |
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$this->drain = true; |
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1 |
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} |
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} |
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equip /
queue
