Package org.datanucleus.cache

This package provides classes implementing caching within DataNucleus.

See: Description

Interface Summary

Interface	Description
Level1Cache	Provides an interface for Level 1 caches.
Level2Cache	Interface for any Level 2 Cache used internally.

Class Summary

Class	Description
AbstractLevel2Cache	Abstract starting point for a third-party L2 cache plugin.
CachedPC<T>	An object that is stored in the Level2 Cache keyed by the identity of the persistable object.
CachedPC.CachedId
JavaxCacheLevel2Cache	Simple implementation of a plugin for use of javax.cache (v0.61+) product with DataNucleus.
JavaxCacheQueryResultCache	Implementation of a query results cache using javax.cache (v0.3+) interface.
L2CachePopulateFieldManager	FieldManager responsible for populating the provided CachedPC object.
L2CacheRetrieveFieldManager	FieldManager responsible for retrieving the values from the provided CachedPC object.
Level2Cache.PinnedClass	Representation of a class whose objects will be pinned when put into the L2 cache.
NullLevel2Cache	Null implementation of a Level 2 Cache.
SoftLevel2Cache	Soft implementation of a Level 2 cache.
SoftRefCache	Level 1 Cache using Soft referenced objects in a Map.
StrongRefCache	Implementation of a Level 1 cache keeping strong references to the objects.
WeakLevel2Cache	Weak referenced implementation of a Level 2 cache.
WeakRefCache	Level 1 Cache using Weak referenced objects in a Map.

Package org.datanucleus.cache Description

This package provides classes implementing caching within DataNucleus. There are 2 caches used internally :-

The first is within the PersistenceManager and is the Level 1 Cache. There are 3 available implementations of a Level 1 Cache here :- SoftRefCache, WeakRefCache and HardRefCache. They provide varying degrees of object retention during the garbage collection process.

The second is across multiple PersistenceManagers within the same PersistenceManagerFactory, and is the Level 2 Cache. There is one implementation of a Level 2 Cache here :- DefaultLevel2Cache. Alternatively, there are plugins for EHCache, SwarmCache, OSCache and Coherence products