co.cask.cdap.security.zookeeper

Class BaseResourceListener<T>

java.lang.Object

co.cask.cdap.security.zookeeper.BaseResourceListener<T>

Type Parameters:

T - The resource type being managed by SharedResourceCache.

All Implemented Interfaces:

ResourceListener<T>

public class BaseResourceListener<T>
extends Object
implements ResourceListener<T>

Simple ResourceListener implementation with no-op implementations. Implementers interested only in handling specific events can subclass this class and override the handler methods that they care about.

Constructor Summary

Constructors

Constructor and Description
BaseResourceListener()

Method Summary

Methods

Modifier and Type	Method and Description
void	onError(String name, Throwable throwable) Invoked when an error occurs in one of the resource operations.
void	onResourceDelete(String name) Invoked when a resource is removed from the shared cache.
void	onResourceUpdate(String name, T instance) Invoked on an update to an individual resource.
void	onUpdate() Invoked when the entire set of cached resources has changed.

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseResourceListener

public BaseResourceListener()

Method Detail

onUpdate

public void onUpdate()

Description copied from interface: ResourceListener

Invoked when the entire set of cached resources has changed.

Specified by:

onUpdate in interface ResourceListener<T>

onResourceUpdate

public void onResourceUpdate(String name,
                    T instance)

Description copied from interface: ResourceListener

Invoked on an update to an individual resource.

Specified by:

onResourceUpdate in interface ResourceListener<T>

Parameters:

name - the key for the resource being updated

instance - the resource instance which was updated

onResourceDelete

public void onResourceDelete(String name)

Description copied from interface: ResourceListener

Invoked when a resource is removed from the shared cache.

Specified by:

onResourceDelete in interface ResourceListener<T>

Parameters:

name - the key for the resource that has been removed

onError

public void onError(String name,
           Throwable throwable)

Description copied from interface: ResourceListener

Invoked when an error occurs in one of the resource operations.

Specified by:

onError in interface ResourceListener<T>

Parameters:

name - the key for the resource on which the error occurred

throwable - the exception that was thrown