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EventDispatcherInterface.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * 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 * @api
22 */
23 interface EventDispatcherInterface
24 {
25 /**
26 * Dispatches an event to all registered listeners.
27 *
28 * @param string $eventName The name of the event to dispatch. The name of
29 * the event is the name of the method that is
30 * invoked on listeners.
31 * @param Event $event The event to pass to the event handlers/listeners.
32 * If not supplied, an empty Event instance is created.
33 *
34 * @return Event
35 *
36 * @api
37 */
38 public function dispatch($eventName, Event $event = null);
39
40 /**
41 * Adds an event listener that listens on the specified events.
42 *
43 * @param string $eventName The event to listen on
44 * @param callable $listener The listener
45 * @param int $priority The higher this value, the earlier an event
46 * listener will be triggered in the chain (defaults to 0)
47 *
48 * @api
49 */
50 public function addListener($eventName, $listener, $priority = 0);
51
52 /**
53 * Adds an event subscriber.
54 *
55 * The subscriber is asked for all the events he is
56 * interested in and added as a listener for these events.
57 *
58 * @param EventSubscriberInterface $subscriber The subscriber.
59 *
60 * @api
61 */
62 public function addSubscriber(EventSubscriberInterface $subscriber);
63
64 /**
65 * Removes an event listener from the specified events.
66 *
67 * @param string $eventName The event to remove a listener from
68 * @param callable $listener The listener to remove
69 */
70 public function removeListener($eventName, $listener);
71
72 /**
73 * Removes an event subscriber.
74 *
75 * @param EventSubscriberInterface $subscriber The subscriber
76 */
77 public function removeSubscriber(EventSubscriberInterface $subscriber);
78
79 /**
80 * Gets the listeners of a specific event or all listeners.
81 *
82 * @param string $eventName The name of the event
83 *
84 * @return array The event listeners for the specified event, or all event listeners by event name
85 */
86 public function getListeners($eventName = null);
87
88 /**
89 * Checks whether an event has any registered listeners.
90 *
91 * @param string $eventName The name of the event
92 *
93 * @return bool true if the specified event has any listeners, false otherwise
94 */
95 public function hasListeners($eventName = null);
96 }
97