class ImmutableEventDispatcher implements

removeListener(string $eventName, callable $listener) Removes an event listener from the specified

addSubscriber(

removeListener(string $eventName, callable $listener) Removes an event listener from the specified

removeSubscriber(

class EventDispatcher implements

getContainer()

addSubscriberService(string $serviceId, string $class) Adds a service as event subscriber.

array getListeners(string $eventName = null) Gets the listeners of a specific event or all listeners

interface EventDispatcherInterface The EventDispatcherInterface is the central point of Symfony's