org.datanucleus.api.jpa

Class JPADataStoreCache

java.lang.Object

org.datanucleus.api.jpa.JPADataStoreCache

All Implemented Interfaces:

javax.persistence.Cache

public class JPADataStoreCache
extends Object
implements javax.persistence.Cache

Implementation of the JPA DataStoreCache. Provides a wrapper and hands off calls to the underlying Level2 cache.

Constructor Summary

Constructors

Constructor and Description
JPADataStoreCache(org.datanucleus.NucleusContext nucleusCtx, org.datanucleus.cache.Level2Cache cache) Constructor.

Method Summary

Modifier and Type	Method and Description
boolean	contains(Class cls, Object pk) Accessor for whether the object with specified PK is contained in the cache.
void	evict(Class cls) Evict the parameter instance from the second-level cache.
void	evict(Class cls, Object pk) Evict the parameter instance from the second-level cache.
void	evictAll() Evict all instances from the second-level cache.
org.datanucleus.cache.Level2Cache	getLevel2Cache() Accessor for the underlying Level 2 cache.
<T> T	unwrap(Class<T> cls) Return an object of the specified type to allow access to the provider-specific API.

Methods inherited from class java.lang.Object

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

Constructor Detail

JPADataStoreCache

public JPADataStoreCache(org.datanucleus.NucleusContext nucleusCtx,
                         org.datanucleus.cache.Level2Cache cache)

Constructor.

Parameters:

nucleusCtx - Context

cache - Level 2 Cache

Method Detail

getLevel2Cache

public org.datanucleus.cache.Level2Cache getLevel2Cache()

Accessor for the underlying Level 2 cache.

Returns:

Underlying L2 cache.

contains

public boolean contains(Class cls,
                        Object pk)

Accessor for whether the object with specified PK is contained in the cache.

Specified by:

contains in interface javax.persistence.Cache

Parameters:

cls - The class

pk - PK of the instance to evict.

Returns:

whether it is contained

evictAll

public void evictAll()

Evict all instances from the second-level cache.

Specified by:

evictAll in interface javax.persistence.Cache

evict

public void evict(Class cls)

Evict the parameter instance from the second-level cache.

Specified by:

evict in interface javax.persistence.Cache

Parameters:

cls - Class of which to evict all objects

evict

public void evict(Class cls,
                  Object pk)

Evict the parameter instance from the second-level cache.

Specified by:

evict in interface javax.persistence.Cache

Parameters:

cls - Class of which to evict the object

pk - PK of the instance to evict.

unwrap

public <T> T unwrap(Class<T> cls)

Return an object of the specified type to allow access to the provider-specific API. If the provider's Cache implementation does not support the specified class, the PersistenceException is thrown.

Specified by:

unwrap in interface javax.persistence.Cache

Parameters:

cls - the class of the object to be returned. This is normally either the underlying Cache implementation class or an interface that it implements.

Returns:

an instance of the specified class

Throws:

javax.persistence.PersistenceException - if the provider does not support the call.