EventDispatcher (Component)

Symfony\Component\EventDispatcher

ContainerAwareEventDispatcher	Lazily loads listeners and subscribers from the dependency injection container
Event	Event is the base class for classes containing event data.
EventDispatcher	The EventDispatcherInterface is the central point of Symfony's event listener system.
GenericEvent	Event encapsulation class.
ImmutableEventDispatcher	A read-only proxy for an event dispatcher.

EventDispatcherInterface	The EventDispatcherInterface is the central point of Symfony's event listener system.
EventSubscriberInterface	An EventSubscriber knows himself what events he is interested in.