com.iizix

Class GenericListener<LISTENER_INTERFACE>

java.lang.Object

com.iizix.GenericListener<LISTENER_INTERFACE>

public class GenericListener<LISTENER_INTERFACE>
extends Object

Class to handle generic listeners in a thread-safe manner.

Author:

Christopher Mindus

Constructor Summary

Constructors

Constructor and Description
GenericListener(Class<LISTENER_INTERFACE> clazz) Constructs the listener.

Method Summary

Modifier and Type	Method and Description
boolean	addListener(LISTENER_INTERFACE listener) Adds a new listener.
boolean	clear() Clears all the listeners.
void	forEach(Consumer<? super LISTENER_INTERFACE> action) Performs the given action for all listeners.
boolean	hasListeners() Checks if there are any current listeners.
LISTENER_INTERFACE[]	listeners() Gets a the listeners array.
boolean	removeListener(LISTENER_INTERFACE listener) Removes a listener.

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericListener

public GenericListener(Class<LISTENER_INTERFACE> clazz)

Constructs the listener.

Parameters:

clazz - The class instance of the listener interface.

Method Detail

addListener

public boolean addListener(LISTENER_INTERFACE listener)

Adds a new listener. Calling this method multiple times with the same listener will have no effect (but to return false).

Parameters:

listener - The listener to add.

Returns:

true if the listener was added, false otherwise.

Throws:

NullPointerException - If the listener is null.

removeListener

public boolean removeListener(LISTENER_INTERFACE listener)

Removes a listener.

Parameters:

listener - The listener to remove.

Returns:

true if listener is successfully removed, false otherwise.

hasListeners

public boolean hasListeners()

Checks if there are any current listeners.

Returns:

true if listeners are present, false otherwise.

clear

public boolean clear()

Clears all the listeners.

Returns:

true for cleared, false if no listeners were present.

listeners

public LISTENER_INTERFACE[] listeners()

Gets a the listeners array.

Returns:

A cached array of the listeners (do not modify the array).

forEach

public void forEach(Consumer<? super LISTENER_INTERFACE> action)

Performs the given action for all listeners. The call to the action is done inside a try-catch and logs potential exceptions.

The default implementation behaves as if:

     for ( Listener listener: listeners() )
       action.accept(listener);
 

Parameters:

action - The action to be performed for each listener.

Throws:

NullPointerException - if the specified action is null.