org.wamblee.observer
Class Observable<ObservableType,Event>

java.lang.Object
  org.wamblee.observer.Observable<ObservableType,Event>

public class Observable<ObservableType,Event>
extends Object

Implements subscription and notification logic for an observer pattern. This class is thread safe.

Constructor Summary

Observable(ObservableType aObservable, ObserverNotifier<ObservableType,Event> aNotifier)
Constructs the observable.

Method Summary

int	getObserverCount() Gets the number of subscribed observers.
void	send(Event aEvent) Notifies all subscribed observers.
long	subscribe(Observer<ObservableType,Event> aObserver) Subscribe an obvers.
void	unsubscribe(long aSubscription) Unsubscribe an observer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Observable

public Observable(ObservableType aObservable,
                  ObserverNotifier<ObservableType,Event> aNotifier)

Constructs the observable.

Parameters:

aObservable - Observable this instance is used for.

aNotifier - Object used for implementing notification of listeners.

Method Detail

subscribe

public long subscribe(Observer<ObservableType,Event> aObserver)

Subscribe an obvers.

Parameters:

aObserver - Observer to subscribe.

Returns:

Event Event to send.

unsubscribe

public void unsubscribe(long aSubscription)

Unsubscribe an observer.

Parameters:

aSubscription - Subscription which is used

Throws:

IllegalArgumentException - In case the subscription is not known.

getObserverCount

public int getObserverCount()

Gets the number of subscribed observers.

Returns:

Number of subscribed observers.

send

public void send(Event aEvent)

Notifies all subscribed observers.

Parameters:

aEvent - Event to send.