Question

When defining an event listener as a service how do i define which function to use with which event?

services.yml:

kernel.listener.desktop_init:
    class: AirOS\TopBarModule\Listeners\InitAdminDesktopListener
    tags:
        - { name: kernel.listener }

listener class:

class InitAdminDesktopListener
{
    public function onInitAdminDesktop(InitAdminDesktopEvent $event)
    {
        $session = $event->getSession();
        $session->set('test2', 'im a test value!');
    }

}

Answer 1

You’re most of the way there; what you need are event and method parameters for your tag (since Beta4 release):

kernel.listener.desktop_init:
    class: AirOS\TopBarModule\Listeners\InitAdminDesktopListener
    tags:
        - { name: kernel.listener, event: onInitAdminDesktop, method: onInitAdminDesktop }

Note that in the upcoming RC1 release of Symfony, you’ll need to use kernel.event_listener instead of kernel.listener for the tag name (see the UPDATE file for more details).