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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 int $priority The higher this value, the earlier an event
* listener will be triggered in the chain (defaults to 0)
*
* @return void
*/
public function addListener(string $eventName, callable $listener, int $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.
*
* @return void
*/
public function addSubscriber(EventSubscriberInterface $subscriber);
/**
* Removes an event listener from the specified events.
*
* @return void
*/
public function removeListener(string $eventName, callable $listener);
/**
* @return void
*/
public function removeSubscriber(EventSubscriberInterface $subscriber);
/**
* Gets the listeners of a specific event or all listeners sorted by descending priority.
*
* @return array<callable[]|callable>
*/
public function getListeners(string $eventName = null): array;
/**
* Gets the listener priority for a specific event.
*
* Returns null if the event or the listener does not exist.
*/
public function getListenerPriority(string $eventName, callable $listener): ?int;
/**
* Checks whether an event has any registered listeners.
*/
public function hasListeners(string $eventName = null): bool;
}
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