de.alpharogroup.design.pattern.observer.api

Interface Subject<T,O extends Observer<T>>

Type Parameters:

T - the generic type of the observable.

O - the generic type of the observer

All Known Implementing Classes:

AbstractSubject, ChatRoom

public interface Subject<T,O extends Observer<T>>

The interface Subject represents the "subject" (which is being "observed") being part of the object whose state change is being observed, to be communicated to the observers upon occurrence.

Method Summary

Modifier and Type	Method and Description
default void	add(O observer) Adds the given observer.
default void	addAll(Collection<O> observers) Adds the given observers.
T	getObservable() Gets the observable.
List<O>	getObservers() Gets the observers that wants to be notified on changes.
default void	remove(O observer) Removes the given observer.
default void	removeAll(Collection<O> observers) Removes the given observers.
void	setObservable(T observable) Sets the observable.
default void	updateObservers() Update observers.

Method Detail

add

default void add(O observer)

Adds the given observer.

Parameters:

observer - the observer to be added.

addAll

default void addAll(Collection<O> observers)

Adds the given observers.

Parameters:

observers - the observers to be added.

getObservable

T getObservable()

Gets the observable.

Returns:

the observable

getObservers

List<O> getObservers()

Gets the observers that wants to be notified on changes.

Returns:

the observers

remove

default void remove(O observer)

Removes the given observer.

Parameters:

observer - the observer to be remove.

removeAll

default void removeAll(Collection<O> observers)

Removes the given observers.

Parameters:

observers - the observers to be remove.

setObservable

void setObservable(T observable)

Sets the observable.

Parameters:

observable - the new observable

updateObservers

default void updateObservers()

Update observers.