org.refcodes.eventbus

Interface EventBusObservable<E extends Event,O extends Observer<E>,EM extends EventMatcher<E>,H>

All Superinterfaces:

HandleLookup<H,O>

All Known Subinterfaces:

EventBus<E,O,EM,H>

All Known Implementing Classes:

AbstractEventBus, EventBusImpl, EventBusObservableImpl

public interface EventBusObservable<E extends Event,O extends Observer<E>,EM extends EventMatcher<E>,H>
extends HandleLookup<H,O>

The Observable part of the EventBus provides means to register Observer instances.

In case your EventBusObservable notifies upon events of type MetaDataEvent, you may use the MetaDataEventImpl and an action for distinguishing your various types of notification:

TIPP: In order to distinguish MetaDataEventImpl instances from each other, create an actions enumeration, enumerating the various event actions you support. Pass the actual action you intend to notify upon to the according constructor, as an Observer you may use the declarative method EventMatcherByDeclaration.actionEqualWith(Object) to test whether your action was notified (or a simple switch case statement).

Method Summary

Modifier and Type	Method and Description
H	subscribe(O aObserver, EM aEventMatcher) Subscribes a listener to the event bus.
void	unsubscribeAll(O aObserver) Unsubscribes all registrations to a specific listener, even if that listener is involved in several subscriptions.

Methods inherited from interface org.refcodes.component.HandleLookup

hasHandle, lookupHandle, removeHandle

Method Detail

subscribe

H subscribe(O aObserver,
            EM aEventMatcher)

Subscribes a listener to the event bus. In case the handle is being ignored, use the "unsubscribeAll" method where all subscriptions for a listener are removed.

Parameters:

aObserver - The Observer to subscribe.

aEventMatcher - The EventMatcher to guard the Observer.

Returns:

A handle to unsubscribe this combination.

unsubscribeAll

void unsubscribeAll(O aObserver)

Unsubscribes all registrations to a specific listener, even if that listener is involved in several subscriptions.

Parameters:

aObserver -