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jderusse wants to merge 3 commits into from
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Add listener autoconfiguration #11252

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Add listner autoconfiguration
jderusse Mar 29, 2019
c3383be
Escape `:`
OskarStark Mar 30, 2019
06cf320
Apply suggestions from code review
OskarStark Mar 30, 2019
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24 changes: 24 additions & 0 deletions event_dispatcher.rst
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Expand Up @@ -129,6 +129,30 @@ listener class:
internal Symfony listeners usually range from ``-255`` to ``255`` but your
own listeners can use any positive or negative integer.


.. tip::

When implementing both the :class:`Symfony\\Component\\EventDispatcher\\EventListenerInterface`
interface, and the ``__invoke`` method with a type-hinted argument, Symfony
uses that type-hint to define the event name.
If :ref:`autoconfigure <services-autoconfigure>` is enabled, you neither
don't have to manually define the ``kernel.event_listner`` tag.
Registering the previous listener could be simplified to::

// src/EventListener/ExceptionListener.php
namespace App\EventListener;

use Symfony\Component\EventDispatcher\EventListenerInterface;
use Symfony\Component\HttpKernel\Event\ExceptionEvent;

class ExceptionListener implements EventListenerInterface
{
public function __invoke(ExceptionEvent $event)
{
// ...
}
}

.. _events-subscriber:

Creating an Event Subscriber
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