| DispatcherInterface | Defines a dispatcher for events. |
| EmailerInterface | E-Mailer Interface |
| EmailMessageInterface | E-Mail Message Interface |
| EventMessageInterface | Event Message Interface. |
| EventResponseInterface | Event response interface |
| ListenerInterface | Mapper from an event to the listeners that are applicable to that event. |
| SMSMessageInterface | SMS Message interface. |
| StoppableEventInterface | An Event whose processing may be interrupted when the event has been handled. |
| WebSocketMessageInterface | Web socket message interface. |