Package com.sun.faces.util

Class ConcurrentCache<K,V>

java.lang.Object

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

Direct Known Subclasses:

ExpiringConcurrentCache

public abstract class ConcurrentCache<K,V>
extends Object

Defines a concurrent cache with a factory for creating new object instances. This (combined with ExpiringConcurrentCache) offers functionality similar to com.sun.faces.util.Cache. Two differences: 1. Cache is concrete/assumes a particular implementation. ConcurrentCache is abstract/allows subclasses to provide the implementation. This facilitates alternative implementations, such as DefaultFaceletCache's NoCache. 2. ConcurrentCache does not provide remove() as part of its contract, since remove behavior may be subclass-specific. For example, ExpiringConcurentCache automatically removes items by checking for expiration rather than requiring manual removes. We should consider consolidating Cache and ConcurrentCache + ExpiringConcurrentCache into a single class hierarchy so that we do not need to duplicate the JCIP scalable result cache code.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	ConcurrentCache.Factory<K,V>	Factory interface for creating various cacheable objects.

Constructor Summary

Constructors

Constructor	Description
ConcurrentCache(ConcurrentCache.Factory<K,V> f)	Constructs this cache using the specified Factory.

Method Summary

Modifier and Type	Method	Description
abstract boolean	containsKey(K key)	Tests whether the cache contains a value for the specified key
abstract V	get(K key)	Retrieves a value for the specified key.
protected ConcurrentCache.Factory<K,V>	getFactory()	Retrieves a Factory instance aasociated with this cache

Methods inherited from class java.lang.Object

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

Constructor Detail

ConcurrentCache

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

Constructs this cache using the specified Factory.

Parameters:

f -

Method Detail

get

public abstract V get(K key)
               throws ExecutionException

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

Parameters:

key - the key the value is associated with

Returns:

the value for the specified key

Throws:

ExecutionException

containsKey

public abstract boolean containsKey(K key)

Tests whether the cache contains a value for the specified key

Parameters:

key - key to test

Returns:

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

getFactory

protected final ConcurrentCache.Factory<K,V> getFactory()

Retrieves a Factory instance aasociated with this cache

Returns:

Factory instance