com.db4o.internal.caching

Class NullCache4<K,V>

java.lang.Object

com.db4o.internal.caching.NullCache4<K,V>

All Implemented Interfaces:

Cache4<K,V>, java.lang.Iterable<V>

public class NullCache4<K,V>
extends java.lang.Object
implements Cache4<K,V>

Constructor Summary

Constructors

Constructor and Description
NullCache4()

Method Summary

Methods

Modifier and Type	Method and Description
java.util.Iterator<V>	iterator()
V	produce(K key, Function4<K,V> producer, Procedure4<V> onDiscard) Retrieves the value associated to the key from the cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullCache4

public NullCache4()

Method Detail

produce

public V produce(K key,
        Function4<K,V> producer,
        Procedure4<V> onDiscard)

Description copied from interface: Cache4

Retrieves the value associated to the key from the cache. If the value is not yet cached producer will be called to produce it. If the cache needs to discard a value finalizer will be given a chance to process it.

Specified by:

produce in interface Cache4<K,V>

Parameters:

key - the key for the value - must never change - cannot be null

producer - will be called if value not yet in the cache - can only be null when the value is found in the cache

onDiscard - will be called if a page needs to be discarded - can be null

Returns:

the cached value

iterator

public java.util.Iterator<V> iterator()

Specified by:

iterator in interface java.lang.Iterable<V>