OptimisticCache (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.cache
Interface OptimisticCache

All Superinterfaces:: Cache

All Known Implementing Classes:: OptimisticTreeCache

public interface OptimisticCache
extends Cache

A contract for transactional cache implementations which support optimistic locking of items within the cache.

The optimisitic locking capabilities are only utilized for the entity cache regions.

Unlike the methods on the Cache interface, all the methods here will only ever be called from access scenarios where versioned data is actually a possiblity (i.e., entity data). Be sure to consult with OptimisticCacheSource.isVersioned() to determine whether versioning is actually in effect.

Author:: Steve Ebersole

Method Summary

void setSource(OptimisticCacheSource source)
          Indicates the "source" of the cached data.

void writeInsert(Object key, Object value, Object currentVersion)
          Called during CacheConcurrencyStrategy.insert(java.lang.Object, java.lang.Object, java.lang.Object) processing for transactional strategies.

void writeLoad(Object key, Object value, Object currentVersion)
          Called during CacheConcurrencyStrategy.put(java.lang.Object, java.lang.Object, long, java.lang.Object, java.util.Comparator, boolean) processing for transactional strategies.

void writeUpdate(Object key, Object value, Object currentVersion, Object previousVersion)
          Called during CacheConcurrencyStrategy.update(java.lang.Object, java.lang.Object, java.lang.Object, java.lang.Object) processing for transactional strategies.

Methods inherited from interface org.hibernate.cache.Cache

clear, destroy, get, getElementCountInMemory, getElementCountOnDisk, getRegionName, getSizeInMemory, getTimeout, lock, nextTimestamp, put, read, remove, toMap, unlock, update

Method Detail

setSource

public void setSource(OptimisticCacheSource source)

Indicates the "source" of the cached data. Currently this will only ever represent an EntityPersister.

Made available to the cache so that it can access certain information about versioning strategy.

Parameters:: source - The source.

writeInsert

public void writeInsert(Object key,
                        Object value,
                        Object currentVersion)

Called during CacheConcurrencyStrategy.insert(java.lang.Object, java.lang.Object, java.lang.Object) processing for transactional strategies. Indicates we have just performed an insert into the DB and now need to cache that entity's data.

Parameters:: key - The cache key.; value - The data to be cached.; currentVersion - The entity's version; or null if not versioned.

writeUpdate

public void writeUpdate(Object key,
                        Object value,
                        Object currentVersion,
                        Object previousVersion)

Called during CacheConcurrencyStrategy.update(java.lang.Object, java.lang.Object, java.lang.Object, java.lang.Object) processing for transactional strategies. Indicates we have just performed an update against the DB and now need to cache the updated state.

Parameters:: key - The cache key.; value - The data to be cached.; currentVersion - The entity's current version; previousVersion - The entity's previous version (before the update); or null if not versioned.

writeLoad

public void writeLoad(Object key,
                      Object value,
                      Object currentVersion)

Called during CacheConcurrencyStrategy.put(java.lang.Object, java.lang.Object, long, java.lang.Object, java.util.Comparator, boolean) processing for transactional strategies. Indicates we have just loaded an entity's state from the database and need it cached.

Parameters:: key - The cache key.; value - The data to be cached.; currentVersion - The entity's version; or null if not versioned.