程序包 org.hibernate.cache.internal

类 DefaultCacheKeysFactory

java.lang.Object

org.hibernate.cache.internal.DefaultCacheKeysFactory

所有已实现的接口:

CacheKeysFactory

public class DefaultCacheKeysFactory
extends Object
implements CacheKeysFactory

Second level cache providers now have the option to use custom key implementations. This was done as the default key implementation is very generic and is quite a large object to allocate in large quantities at runtime. In some extreme cases, for example when the hit ratio is very low, this was making the efficiency penalty vs its benefits tradeoff questionable.

Depending on configuration settings there might be opportunities to use simpler key implementations, for example when multi-tenancy is not being used to avoid the tenant identifier, or when a cache instance is entirely dedicated to a single type to use the primary id only, skipping the role or entity name.

Even with multiple types sharing the same cache, their identifiers could be of the same Type; in this case the cache container could use a single type reference to implement a custom equality function without having to look it up on each equality check: that's a small optimisation but the equality function is often invoked extremely frequently.

Another reason is to make it more convenient to implement custom serialization protocols when the implementation supports clustering.

从以下版本开始:

5.0

作者:

Sanne Grinovero

另请参阅:

Type.getHashCode(Object, SessionFactoryImplementor), Type.isEqual(Object, Object)

字段概要

字段

修饰符和类型	字段	说明
static DefaultCacheKeysFactory	INSTANCE
static String	SHORT_NAME

构造器概要

构造器

构造器	说明
DefaultCacheKeysFactory()

方法概要

修饰符和类型	方法	说明
Object	createCollectionKey(Object id, CollectionPersister persister, SessionFactoryImplementor factory, String tenantIdentifier)
Object	createEntityKey(Object id, EntityPersister persister, SessionFactoryImplementor factory, String tenantIdentifier)
Object	createNaturalIdKey(Object[] naturalIdValues, EntityPersister persister, SharedSessionContractImplementor session)
Object	getCollectionId(Object cacheKey)
Object	getEntityId(Object cacheKey)
Object[]	getNaturalIdValues(Object cacheKey)
static Object	staticCreateCollectionKey(Object id, CollectionPersister persister, SessionFactoryImplementor factory, String tenantIdentifier)
static Object	staticCreateEntityKey(Object id, EntityPersister persister, SessionFactoryImplementor factory, String tenantIdentifier)
static Object	staticCreateNaturalIdKey(Object[] naturalIdValues, EntityPersister persister, SharedSessionContractImplementor session)
static Object	staticGetCollectionId(Object cacheKey)
static Object	staticGetEntityId(Object cacheKey)
static Object[]	staticGetNaturalIdValues(Object cacheKey)

从类继承的方法 java.lang.Object

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

字段详细资料

SHORT_NAME

public static final String SHORT_NAME

另请参阅:

常量字段值

INSTANCE

public static final DefaultCacheKeysFactory INSTANCE

构造器详细资料

DefaultCacheKeysFactory

public DefaultCacheKeysFactory()

方法详细资料

staticCreateCollectionKey

public static Object staticCreateCollectionKey(Object id,
                                               CollectionPersister persister,
                                               SessionFactoryImplementor factory,
                                               String tenantIdentifier)

staticCreateEntityKey

public static Object staticCreateEntityKey(Object id,
                                           EntityPersister persister,
                                           SessionFactoryImplementor factory,
                                           String tenantIdentifier)

staticCreateNaturalIdKey

public static Object staticCreateNaturalIdKey(Object[] naturalIdValues,
                                              EntityPersister persister,
                                              SharedSessionContractImplementor session)

staticGetEntityId

public static Object staticGetEntityId(Object cacheKey)

staticGetCollectionId

public static Object staticGetCollectionId(Object cacheKey)

staticGetNaturalIdValues

public static Object[] staticGetNaturalIdValues(Object cacheKey)

createCollectionKey

public Object createCollectionKey(Object id,
                                  CollectionPersister persister,
                                  SessionFactoryImplementor factory,
                                  String tenantIdentifier)

指定者:

createCollectionKey 在接口中 CacheKeysFactory

createEntityKey

public Object createEntityKey(Object id,
                              EntityPersister persister,
                              SessionFactoryImplementor factory,
                              String tenantIdentifier)

指定者:

createEntityKey 在接口中 CacheKeysFactory

createNaturalIdKey

public Object createNaturalIdKey(Object[] naturalIdValues,
                                 EntityPersister persister,
                                 SharedSessionContractImplementor session)

指定者:

createNaturalIdKey 在接口中 CacheKeysFactory

getEntityId

public Object getEntityId(Object cacheKey)

指定者:

getEntityId 在接口中 CacheKeysFactory

getCollectionId

public Object getCollectionId(Object cacheKey)

指定者:

getCollectionId 在接口中 CacheKeysFactory

getNaturalIdValues

public Object[] getNaturalIdValues(Object cacheKey)

指定者:

getNaturalIdValues 在接口中 CacheKeysFactory