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EventSubscriberInterface.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 * An EventSubscriber knows itself what events it is interested in.
16 * If an EventSubscriber is added to an EventDispatcherInterface, the manager invokes
17 * {@link getSubscribedEvents} and registers the subscriber as a listener for all
18 * returned events.
19 *
20 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
21 * @author Jonathan Wage <jonwage@gmail.com>
22 * @author Roman Borschel <roman@code-factory.org>
23 * @author Bernhard Schussek <bschussek@gmail.com>
24 */
25 interface EventSubscriberInterface
26 {
27 /**
28 * Returns an array of event names this subscriber wants to listen to.
29 *
30 * The array keys are event names and the value can be:
31 *
32 * * The method name to call (priority defaults to 0)
33 * * An array composed of the method name to call and the priority
34 * * An array of arrays composed of the method names to call and respective
35 * priorities, or 0 if unset
36 *
37 * For instance:
38 *
39 * * ['eventName' => 'methodName']
40 * * ['eventName' => ['methodName', $priority]]
41 * * ['eventName' => [['methodName1', $priority], ['methodName2']]]
42 *
43 * The code must not depend on runtime state as it will only be called at compile time.
44 * All logic depending on runtime state must be put into the individual methods handling the events.
45 *
46 * @return array The event names to listen to
47 */
48 public static function getSubscribedEvents();
49 }
50