com.h3c.util.observer

Class AbstractListenerHandler<T>

java.lang.Object

com.h3c.util.observer.AbstractListenerHandler<T>

Type Parameters:

T - type of the listener.

All Implemented Interfaces:

ListenerHandler<T>, Observable<T>

Direct Known Subclasses:

MultiThreadListenerHandler, SingleThreadListenerHandler

public abstract class AbstractListenerHandler<T>
extends Object
implements ListenerHandler<T>

Abstract listener handler.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractListenerHandler(Store<T> listenerStore, ErrorHandler<T,Exception> errorHandler) Creates a new listener handler.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract void	executeCallback(T listener, Invoker<T> invoker) Executes a call back method to notify the listener.
protected ErrorHandler<T,Exception>	getErrorHandler() Gets the error handler used to delegate error handling when notifying a listener.
protected void	notify(Collection<T> listenersToNotify, Invoker<T> invoker) Notifies listeners.
void	notifyListeners(Invoker<T> invoker) Notifies listeners.
void	register(T listener) Registers an observer (listener).
void	unregister(T listener) Unregisters an observer (listener).

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractListenerHandler

protected AbstractListenerHandler(Store<T> listenerStore,
                       ErrorHandler<T,Exception> errorHandler)

Creates a new listener handler.

Parameters:

listenerStore - listener store.

errorHandler - error handler used to delegate error handling when notifying a listener.

Method Detail

register

public void register(T listener)

Description copied from interface: Observable

Registers an observer (listener).

Specified by:

register in interface Observable<T>

Parameters:

listener - observer to register

unregister

public void unregister(T listener)

Description copied from interface: Observable

Unregisters an observer (listener).

Specified by:

unregister in interface Observable<T>

Parameters:

listener - observer to unregister

notifyListeners

public void notifyListeners(Invoker<T> invoker)

Description copied from interface: ListenerHandler

Notifies listeners.

Specified by:

notifyListeners in interface ListenerHandler<T>

Parameters:

invoker - Invoker to perform the listener call back method.

getErrorHandler

protected ErrorHandler<T,Exception> getErrorHandler()

Gets the error handler used to delegate error handling when notifying a listener.

Returns:

the error handler.

notify

protected void notify(Collection<T> listenersToNotify,
          Invoker<T> invoker)

Notifies listeners.

Parameters:

listenersToNotify - listeners to notify.

invoker - invoker to use.

executeCallback

protected abstract void executeCallback(T listener,
                   Invoker<T> invoker)

Executes a call back method to notify the listener.

Parameters:

listener - Listener to notify.

invoker - Invoker to use.