|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||
public interface Receiver
A receiver registers its interest in a class
of events through the EventManager.
An event is an object of the interface Event
or a subclass/interface of it. Usually a receiver is not interested in
every event but only for some specific event types. These types are represented
by an own subclass/interface.
When a receiver subscribes itself at the event manager, the manager checks (using
reflection) for occurances of the method "inform" on the receiver. The signature
of the method consists of two parameters, where the first one is the event subclass
and the second one the PortalService.
If for example a receiver is interested in all CopletInstanceEvents
then it subscribes using the event manager and should provide an inform method
with the following signature:
public void inform(CopletInstanceEvent event, PortalService).
If a receiver is interested in more than one event type, then it can implement
several inform methods each with the corresponding event class as the first
parameter. However, it is important to notice that the current implementation
of the event manager has some restrictions! A receiver should not implement to
inform methods where one event is a subclass or subinterface of the other event.
In that case only one method is called and it's not deterministic which one will be called
(this may vary for example on the used operating system the code runs on!).
This problem will be solved in 2.2.
|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | |||||||||