<?php

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/*

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* This file is part of the Symfony package.

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*

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* (c) Fabien Potencier <fabien@symfony.com>

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*

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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*/

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/**

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* The EventDispatcherInterface is the central point of Symfony'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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* @author Bernhard Schussek <bschussek@gmail.com>

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*

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* @api

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*/

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interface Symfony_EventDispatcher_EventDispatcherInterface

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{

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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

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* the event is the name of the method that is

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* invoked on listeners.

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* @param Symfony_EventDispatcher_Event $event The event to pass to the event handlers/listeners.

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* If not supplied, an empty Event instance is created.

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*

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* @return Symfony_EventDispatcher_Event

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*

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* @api

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*/

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public function dispatch($eventName, Symfony_EventDispatcher_Event $event = null);

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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 $eventName The event to listen on

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* @param callable $listener The listener

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* @param int $priority The higher this value, the earlier an event

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* listener will be triggered in the chain (defaults to 0)

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*

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* @api

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*/

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public function addListener($eventName, $listener, $priority = 0);

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/**

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* Adds an event subscriber.

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*

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* The subscriber is asked for all the events he is

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* interested in and added as a listener for these events.

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*

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* @param Symfony_EventDispatcher_EventSubscriberInterface $subscriber The subscriber.

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*

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* @api

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*/

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public function addSubscriber(Symfony_EventDispatcher_EventSubscriberInterface $subscriber);

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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 $eventName The event to remove a listener from

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* @param callable $listener The listener to remove

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*/

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public function removeListener($eventName, $listener);

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/**

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* Removes an event subscriber.

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*

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* @param Symfony_EventDispatcher_EventSubscriberInterface $subscriber The subscriber

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*/

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public function removeSubscriber(Symfony_EventDispatcher_EventSubscriberInterface $subscriber);

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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 $eventName The name of the event

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*

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* @return array The event listeners for the specified event, or all event listeners by event name

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*/

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public function getListeners($eventName = null);

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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 $eventName The name of the 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($eventName = null);

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}

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