Package com.sun.faces.util

Class ExpiringConcurrentCache<K,V>

java.lang.Object

com.sun.faces.util.ConcurrentCache<K,V>

com.sun.faces.util.ExpiringConcurrentCache<K,V>

public final class ExpiringConcurrentCache<K,V>
extends ConcurrentCache<K,V>

This class implements an abstract ConcurrentCache with objects in the cache potentially expiring. Only non-expired objects will be returned from the cache or considered to be contained in the cache The cache is self-managing, so no remove() method is defined

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	ExpiringConcurrentCache.ExpiryChecker<K,V>	Interface for checking whether a cached object expired

Nested classes/interfaces inherited from class com.sun.faces.util.ConcurrentCache

ConcurrentCache.Factory<K,V>

Constructor Summary

Constructors

Constructor	Description
ExpiringConcurrentCache(ConcurrentCache.Factory<K,V> f, ExpiringConcurrentCache.ExpiryChecker<K,V> checker)	Public constructor.

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(K key)	Tests whether the cache contains a value for the specified key
V	get(K key)	Retrieves a value for the specified key.

Methods inherited from class com.sun.faces.util.ConcurrentCache

getFactory

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpiringConcurrentCache

public ExpiringConcurrentCache(ConcurrentCache.Factory<K,V> f,
                               ExpiringConcurrentCache.ExpiryChecker<K,V> checker)

Public constructor.

Parameters:

f - used to create new instances of objects that are not already available

checker - used to check whether an object in the cache has expired

Method Detail

get

public V get(K key)
      throws ExecutionException

Description copied from class: ConcurrentCache

Retrieves a value for the specified key. If the value is not already present in the cache, a new instance will be allocated using the Factory interface

Specified by:

get in class ConcurrentCache<K,V>

Parameters:

key - the key the value is associated with

Returns:

the value for the specified key

Throws:

ExecutionException

containsKey

public boolean containsKey(K key)

Description copied from class: ConcurrentCache

Tests whether the cache contains a value for the specified key

Specified by:

containsKey in class ConcurrentCache<K,V>

Parameters:

key - key to test

Returns:

true if the value for the specified key is already cached, false otherwise