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<?php |
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namespace Workana\AsyncJobs; |
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use Throwable; |
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use Exception; |
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use Bernard\Envelope; |
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use Bernard\Queue; |
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use Bernard\Router; |
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use Symfony\Component\EventDispatcher\EventDispatcherInterface; |
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use Workana\AsyncJobs\Event\SuccessfulExecutionEvent; |
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use Workana\AsyncJobs\Process\ProcessManager; |
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use Workana\AsyncJobs\Event\AfterExecutionEvent; |
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use Workana\AsyncJobs\Event\BeforeExecutionEvent; |
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use Workana\AsyncJobs\Event\RejectedExecutionEvent; |
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use Workana\AsyncJobs\Event\WorkerShutdownEvent; |
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use Workana\AsyncJobs\Util\Sleeper; |
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use Workana\AsyncJobs\Retry\RetryStrategy; |
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/** |
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* Worker class |
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* |
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* @author Carlos Frutos <[email protected]> |
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*/ |
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class Worker |
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{ |
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/** |
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* @var ProcessManager |
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*/ |
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protected $pm; |
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/** |
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* @var Stopwatch |
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*/ |
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protected $stopwatch; |
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/** |
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* @var Sleeper |
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*/ |
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protected $sleeper; |
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/** |
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* @var Router |
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*/ |
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protected $router; |
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/** |
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* @var Queue |
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*/ |
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protected $queue; |
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/** |
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* @var RetryStrategy |
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*/ |
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protected $retryStrategy; |
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/** |
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* @var int |
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*/ |
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protected $shutdownSignal = null; |
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/** |
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* Create a new Worker |
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* |
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* @param Queue $queue |
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* @param Router $router |
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* @param EventDispatcherInterface $eventDispatcher |
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* @param ProcessManager $processManager |
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* @param RetryStrategy $retryStrategy |
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*/ |
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public function __construct( |
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Queue $queue, |
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Router $router, |
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EventDispatcherInterface $eventDispatcher, |
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ProcessManager $processManager, |
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RetryStrategy $retryStrategy |
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) { |
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$this->queue = $queue; |
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$this->router = $router; |
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$this->eventDispatcher = $eventDispatcher; |
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$this->pm = $processManager; |
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$this->stopwatch = new Stopwatch(); |
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$this->sleeper = new Sleeper(); |
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$this->retryStrategy = $retryStrategy; |
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$this->bindSignals(); |
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} |
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/** |
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* Bind signal handlers |
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* |
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* @return void |
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*/ |
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protected function bindSignals() |
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{ |
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$this->pm->signals()->registerHandler(SIGTERM, [$this, 'shutdown']); |
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$this->pm->signals()->registerHandler(SIGINT, [$this, 'shutdown']); |
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$this->pm->signals()->registerHandler(SIGQUIT, [$this, 'shutdown']); |
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} |
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/** |
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* Shutdown worker |
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* |
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* @return void |
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*/ |
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public function shutdown($signal = SIGTERM) |
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{ |
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$this->shutdownSignal = $signal; |
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$this->eventDispatcher->dispatch(AsyncJobsEvents::WORKER_SHUTDOWN, new WorkerShutdownEvent()); |
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} |
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/** |
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* Run worker |
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* |
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* @return void |
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*/ |
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public function run() |
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{ |
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while ($this->shouldContinue()) { |
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$envelope = $this->queue->dequeue(); |
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if ($envelope) { |
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$this->invoke($envelope); |
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} else { |
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$this->sleeper->sleep(1); |
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} |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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protected function shouldContinue() |
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{ |
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$this->pm->dispatch(); |
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return empty($this->shutdownSignal); |
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} |
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/** |
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* Invoke job execution |
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* |
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* @param Envelope $envelope |
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* |
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* @return void |
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*/ |
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public function invoke(Envelope $envelope) |
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{ |
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$this->eventDispatcher->dispatch(AsyncJobsEvents::BEFORE_EXECUTION, new BeforeExecutionEvent()); |
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try { |
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$this->stopwatch->start(); |
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call_user_func($this->router->map($envelope), $envelope->getMessage()); |
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$this->queue->acknowledge($envelope); |
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$info = new ExecutionInfo($envelope->getMessage(), $this->queue, $this->stopwatch); |
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$this->eventDispatcher->dispatch(AsyncJobsEvents::SUCCESSFUL_EXECUTION, new SuccessfulExecutionEvent($envelope, $this, $info)); |
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} catch (Throwable $t) { |
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$this->handleRejected($envelope, $t); |
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} catch (Exception $e) { |
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$this->handleRejected($envelope, $e); |
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} |
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$this->eventDispatcher->dispatch(AsyncJobsEvents::AFTER_EXECUTION, new AfterExecutionEvent()); |
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} |
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/** |
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* Get Process Managerç |
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* |
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* @return ProcessManager |
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*/ |
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public function getProcessManager() |
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{ |
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return $this->pm; |
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} |
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/** |
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* Handle rejected job |
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* |
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* @param Envelope $envelope Envelope |
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* @param Throwable|Exception $error Error |
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*/ |
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protected function handleRejected(Envelope $envelope, $error) |
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{ |
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$info = new ExecutionInfo($envelope->getMessage(), $this->queue, $this->stopwatch); |
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$this->eventDispatcher->dispatch(AsyncJobsEvents::REJECTED_EXECUTION, new RejectedExecutionEvent( |
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$envelope, |
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$error, |
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$this, |
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$info |
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)); |
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$this->queue->acknowledge($envelope); |
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$this->retryStrategy->handleRetry($envelope, $error); |
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} |
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} |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: