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<?php |
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namespace Doctrine\Common; |
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use function spl_object_hash; |
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/** |
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* The EventManager is the central point of Doctrine's event listener system. |
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* Listeners are registered on the manager and events are dispatched through the |
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* manager. |
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*/ |
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class EventManager |
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{ |
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/** |
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* Map of registered listeners. |
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* <event> => <listeners> |
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* |
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* @var object[][] |
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*/ |
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private $_listeners = []; |
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/** |
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* Dispatches an event to all registered listeners. |
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* |
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* @param string $eventName The name of the event to dispatch. The name of the event is |
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* the name of the method that is invoked on listeners. |
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* @param EventArgs|null $eventArgs The event arguments to pass to the event handlers/listeners. |
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* If not supplied, the single empty EventArgs instance is used. |
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* |
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* @return void |
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*/ |
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public function dispatchEvent($eventName, ?EventArgs $eventArgs = null) |
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{ |
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if (! isset($this->_listeners[$eventName])) { |
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return; |
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} |
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$eventArgs = $eventArgs ?? EventArgs::getEmptyInstance(); |
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foreach ($this->_listeners[$eventName] as $listener) { |
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$listener->$eventName($eventArgs); |
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} |
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} |
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/** |
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* Gets the listeners of a specific event or all listeners. |
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* |
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* @param string|null $event The name of the event. |
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* |
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* @return object[]|object[][] The event listeners for the specified event, or all event listeners. |
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*/ |
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public function getListeners($event = null) |
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{ |
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return $event ? $this->_listeners[$event] : $this->_listeners; |
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} |
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/** |
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* Checks whether an event has any registered listeners. |
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* |
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* @param string $event |
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* |
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* @return bool TRUE if the specified event has any listeners, FALSE otherwise. |
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*/ |
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public function hasListeners($event) |
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{ |
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return ! empty($this->_listeners[$event]); |
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} |
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/** |
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* Adds an event listener that listens on the specified events. |
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* |
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* @param string|string[] $events The event(s) to listen on. |
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* @param object $listener The listener object. |
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* |
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* @return void |
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*/ |
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public function addEventListener($events, $listener) |
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{ |
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// Picks the hash code related to that listener |
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$hash = spl_object_hash($listener); |
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foreach ((array) $events as $event) { |
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// Overrides listener if a previous one was associated already |
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// Prevents duplicate listeners on same event (same instance only) |
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$this->_listeners[$event][$hash] = $listener; |
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} |
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} |
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/** |
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* Removes an event listener from the specified events. |
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* |
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* @param string|string[] $events |
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* @param object $listener |
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* |
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* @return void |
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*/ |
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public function removeEventListener($events, $listener) |
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{ |
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// Picks the hash code related to that listener |
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$hash = spl_object_hash($listener); |
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foreach ((array) $events as $event) { |
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unset($this->_listeners[$event][$hash]); |
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} |
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} |
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/** |
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* Adds an EventSubscriber. The subscriber is asked for all the events it is |
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* interested in and added as a listener for these events. |
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* |
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* @param EventSubscriber $subscriber The subscriber. |
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* |
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* @return void |
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*/ |
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public function addEventSubscriber(EventSubscriber $subscriber) |
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{ |
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$this->addEventListener($subscriber->getSubscribedEvents(), $subscriber); |
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} |
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/** |
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* Removes an EventSubscriber. The subscriber is asked for all the events it is |
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* interested in and removed as a listener for these events. |
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* |
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* @param EventSubscriber $subscriber The subscriber. |
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* |
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* @return void |
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*/ |
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public function removeEventSubscriber(EventSubscriber $subscriber) |
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{ |
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$this->removeEventListener($subscriber->getSubscribedEvents(), $subscriber); |
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} |
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} |
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doctrine /
event-manager
