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<?php |
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declare(strict_types=1); |
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namespace Lej\Component\Domain\Model; |
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class DomainEventPublisher |
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{ |
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/** |
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* @var DomainEventPublisher |
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*/ |
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private static $instance; |
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/** |
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* @var DomainEventSubscriber[][] |
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*/ |
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private $subscribers; |
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/** |
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* Returns an instance of the publisher. |
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* @return DomainEventPublisher |
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*/ |
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public static function instance() : DomainEventPublisher |
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{ |
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return self::$instance ? self::$instance : new self(); |
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} |
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/** |
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* Publishes a domain event by notifying all the subscribers subscribed to |
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* this event type. Subscribers can be notified for all events if they |
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* subscribe to DomainEvent::class. |
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* @param DomainEvent $event |
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*/ |
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public function publish(DomainEvent $event) |
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{ |
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$subscribers = []; |
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$eventType = get_class($event); |
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if (isset($this->subscribers[$eventType])) { |
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$subscribers += $this->subscribers[$eventType]; |
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} |
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if (isset($this->subscribers[DomainEvent::class])) { |
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$subscribers += $this->subscribers[DomainEvent::class]; |
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} |
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foreach ($subscribers as $subscriber) { |
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$subscriber->handleEvent($event); |
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} |
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} |
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/** |
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* Resets the publisher by removing all the current subscribers. |
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*/ |
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public function reset() |
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{ |
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$this->subscribers = []; |
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} |
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/** |
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* @param DomainEventSubscriber $subscriber |
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*/ |
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public function subscribe(DomainEventSubscriber $subscriber) |
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{ |
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$this->subscribers[$subscriber->subscribedToEventType()][] = $subscriber; |
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} |
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/** |
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* The constructor. |
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*/ |
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private function __construct() |
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{ |
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$this->subscribers = []; |
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} |
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/** |
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* Clones the publisher. |
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*/ |
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private function __clone() |
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{ |
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} |
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} |
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torstenheinrich /
lej-ddd
