Symfony Events require different event listener connection than normal

[BurningDog]

I'm using Symfony 4.4. The documentation at https://finite.readthedocs.io/en/master/usage/symfony.html#using-callbacks say:

Events dispatched with the EventDispatcher and works as the Symfony kernel events.

This would seem to imply that one can simply follow the standard Symfony ways of registering an event listener. i.e. using services.yaml or Creating an Event Subscriber.

However, neither of those work, because Finite creates its own event dispatcher! When a new StateMachine is created, it creates a new StateMachineDispatcher() which creates...a new Symfony\Component\EventDispatcher\EventDispatcher.

So any Symfony event registered in the normal way will not listen to the event.

Solution

We have to connect our event listener to the StateMachine's dispatcher.

$sm = new StateMachine();
$dispatcher = $sm->getDispatcher();
$dispatcher->addListener(FiniteEvents::POST_TRANSITION, [new MyPostTransitionListener(), 'onFinitePostTransition']);

class MyPostTransitionListener
{
    public function onFinitePostTransition(\Finite\Event\TransitionEvent $event)
    {
        // handle event here
    }
}

[amadeot]

Fixed by #158