crm.fsf.org/20131203/files/sites/all/modules-old/civicrm/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/EventDispatcherInterface.php

   1 <?php
   2
   3 /*
   4  * This file is part of the Symfony package.
   5  *
   6  * (c) Fabien Potencier <fabien@symfony.com>
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 namespace Symfony\Component\EventDispatcher;
  13
  14 /**
  15  * The EventDispatcherInterface is the central point of Symfony's event listener system.
  16  * Listeners are registered on the manager and events are dispatched through the
  17  * manager.
  18  *
  19  * @author Bernhard Schussek <bschussek@gmail.com>
  20  */
  21 interface EventDispatcherInterface
  22 {
  23     /**
  24      * Dispatches an event to all registered listeners.
  25      *
  26      * @param string $eventName The name of the event to dispatch. The name of
  27      *                          the event is the name of the method that is
  28      *                          invoked on listeners.
  29      * @param Event  $event     The event to pass to the event handlers/listeners.
  30      *                          If not supplied, an empty Event instance is created.
  31      *
  32      * @return Event
  33      */
  34     public function dispatch($eventName, Event $event = null);
  35
  36     /**
  37      * Adds an event listener that listens on the specified events.
  38      *
  39      * @param string   $eventName The event to listen on
  40      * @param callable $listener  The listener
  41      * @param int      $priority  The higher this value, the earlier an event
  42      *                            listener will be triggered in the chain (defaults to 0)
  43      */
  44     public function addListener($eventName, $listener, $priority = 0);
  45
  46     /**
  47      * Adds an event subscriber.
  48      *
  49      * The subscriber is asked for all the events he is
  50      * interested in and added as a listener for these events.
  51      *
  52      * @param EventSubscriberInterface $subscriber The subscriber.
  53      */
  54     public function addSubscriber(EventSubscriberInterface $subscriber);
  55
  56     /**
  57      * Removes an event listener from the specified events.
  58      *
  59      * @param string   $eventName The event to remove a listener from
  60      * @param callable $listener  The listener to remove
  61      */
  62     public function removeListener($eventName, $listener);
  63
  64     /**
  65      * Removes an event subscriber.
  66      *
  67      * @param EventSubscriberInterface $subscriber The subscriber
  68      */
  69     public function removeSubscriber(EventSubscriberInterface $subscriber);
  70
  71     /**
  72      * Gets the listeners of a specific event or all listeners sorted by descending priority.
  73      *
  74      * @param string $eventName The name of the event
  75      *
  76      * @return array The event listeners for the specified event, or all event listeners by event name
  77      */
  78     public function getListeners($eventName = null);
  79
  80     /**
  81      * Checks whether an event has any registered listeners.
  82      *
  83      * @param string $eventName The name of the event
  84      *
  85      * @return bool true if the specified event has any listeners, false otherwise
  86      */
  87     public function hasListeners($eventName = null);
  88 }