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