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<?php |
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namespace PhpDDD\DomainDrivenDesign\Event; |
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use PhpDDD\Utils\ClassUtils; |
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final class EventDispatcher implements EventDispatcherInterface |
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{ |
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/** |
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* @var EventListener[] |
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*/ |
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private $listeners = []; |
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/** |
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* @param AbstractEvent $event |
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* @param bool $asynchronous |
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* |
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* @return AbstractEvent |
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*/ |
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public function publish(AbstractEvent $event, $asynchronous = false) |
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{ |
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$eventName = ClassUtils::getCanonicalName($event); |
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$this->doPublish($this->getListeners($event, $asynchronous), $eventName, $event); |
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return $event; |
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} |
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/** |
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* @param EventSubscriberInterface $subscriber |
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*/ |
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public function subscribe(EventSubscriberInterface $subscriber) |
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{ |
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foreach ($subscriber->getSubscribedEvents() as $subscribedEvent) { |
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$subscribedEvent->setSubscriber($subscriber); |
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$this->listeners[] = $subscribedEvent; |
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} |
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} |
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/** |
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* @param AbstractEvent $event |
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* @param bool $asynchronous |
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* |
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* @return EventListener[] |
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*/ |
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public function getListeners(AbstractEvent $event, $asynchronous = false) |
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{ |
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return array_filter( |
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$this->listeners, |
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function (EventListener $eventSubscriber) use ($asynchronous, $event) { |
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$supportedEvent = $eventSubscriber->getEventClassName(); |
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if ($eventSubscriber->isAsynchronous() !== $asynchronous) { |
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return false; |
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} |
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if (null === $supportedEvent) { |
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return true; |
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} |
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return $event instanceof $supportedEvent; |
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} |
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); |
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} |
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/** |
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* Triggers the listeners of an event. |
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* |
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* This method can be overridden to add functionality that is executed |
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* for each listener. |
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* |
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* @param EventListener[] $listeners The event listeners. |
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* @param string $eventName The name of the event to dispatch. |
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* @param AbstractEvent $event The event object to pass to the event handlers/listeners. |
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*/ |
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private function doPublish(array $listeners, $eventName, AbstractEvent $event) |
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{ |
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foreach ($listeners as $listener) { |
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call_user_func($listener->getMethod(), $event, $eventName, $this); |
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} |
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} |
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} |
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php-ddd /
domain-driven-design
