[转]Event Model
An event model is composed of the event source, the event itself, and the event listener: the event source, or provider, is the sender of the events; the event is the object that is sent; and the event listener, or event sink, is the receiver of the events.
An event model is a set of classes and interfaces that determine how these components relate to each other.
On the event source side, an event model determines how components may...
- create and describe events,
- trigger, or fire, events, or
- distribute events to interested components.
On the listener side, an event model determines how components may...
- subscribe to event sources,
- react to events when received, or
- remove the subscription to event sources when desired.
