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<?php |
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namespace Pulsar; |
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use Pulsar\Event\AbstractEvent; |
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use Pulsar\Exception\ListenerException; |
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use Symfony\Component\EventDispatcher\EventDispatcher; |
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/** |
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* Manages the event bus for model lifecycle events. |
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*/ |
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class EventManager |
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{ |
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/** @var array */ |
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private static $dispatchers = []; |
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/** |
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* Gets the event dispatcher. |
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*/ |
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public static function getDispatcher(string $class): EventDispatcher |
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{ |
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if (!isset(self::$dispatchers[$class])) { |
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self::$dispatchers[$class] = new EventDispatcher(); |
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} |
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return self::$dispatchers[$class]; |
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} |
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/** |
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* Resets the event dispatcher for a given class. |
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*/ |
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public static function reset(string $class): void |
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{ |
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if (isset(self::$dispatchers[$class])) { |
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unset(self::$dispatchers[$class]); |
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} |
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} |
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/** |
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* Subscribes to a listener to an event. |
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* |
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* @param string $event event name |
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* @param int $priority optional priority, higher #s get called first |
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*/ |
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public static function listen(string $class, string $event, callable $listener, int $priority = 0): void |
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{ |
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self::getDispatcher($class)->addListener($event, $listener, $priority); |
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} |
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/** |
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* Dispatches the given event and checks if it was successful. |
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* If it fails then any active transaction will be rolled back |
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* on the model. |
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* |
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* @return bool true if the events were successfully propagated |
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*/ |
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public static function dispatch(Model $model, AbstractEvent $event, bool $usesTransactions): bool |
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{ |
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// Model events can fail whenever $event->stopPropagation() is called |
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// or when a specific exception type is thrown by the listener. |
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try { |
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self::getDispatcher(get_class($model))->dispatch($event, $event::NAME); |
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} catch (ListenerException $e) { |
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// Listener exceptions provide the error message to be stored on the model |
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$model->getErrors()->add($e->getMessage(), $e->getContext()); |
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$event->stopPropagation(); |
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} |
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if (!$event->isPropagationStopped()) { |
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return true; |
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} |
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// when listeners fail roll back any database transaction |
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if ($usesTransactions) { |
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$model::getDriver()->rollBackTransaction($model->getConnection()); |
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} |
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return false; |
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} |
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} |
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jaredtking /
pulsar
