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EventDispatcherInterface.php
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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\EventDispatcher; use Symfony\Contracts\EventDispatcher\EventDispatcherInterface as ContractsEventDispatcherInterface; /** * The EventDispatcherInterface is the central point of Symfony's event listener system. * Listeners are registered on the manager and events are dispatched through the * manager. * * @author Bernhard Schussek <bschussek@gmail.com> */ interface EventDispatcherInterface extends ContractsEventDispatcherInterface { /** * Adds an event listener that listens on the specified events. * * @param string $eventName The event to listen on * @param callable $listener The listener * @param int $priority The higher this value, the earlier an event * listener will be triggered in the chain (defaults to 0) */ public function addListener($eventName, $listener, $priority = 0); /** * Adds an event subscriber. * * The subscriber is asked for all the events it is * interested in and added as a listener for these events. */ public function addSubscriber(EventSubscriberInterface $subscriber); /** * Removes an event listener from the specified events. * * @param string $eventName The event to remove a listener from * @param callable $listener The listener to remove */ public function removeListener($eventName, $listener); public function removeSubscriber(EventSubscriberInterface $subscriber); /** * Gets the listeners of a specific event or all listeners sorted by descending priority. * * @param string|null $eventName The name of the event * * @return array The event listeners for the specified event, or all event listeners by event name */ public function getListeners($eventName = null); /** * Gets the listener priority for a specific event. * * Returns null if the event or the listener does not exist. * * @param string $eventName The name of the event * @param callable $listener The listener * * @return int|null The event listener priority */ public function getListenerPriority($eventName, $listener); /** * Checks whether an event has any registered listeners. * * @param string|null $eventName The name of the event * * @return bool true if the specified event has any listeners, false otherwise */ public function hasListeners($eventName = null); }
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