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## Package org.hibernate.cache

This package defines APIs/SPIs and implementations for the Hibernate second-level cache.

See:
Description

Interface Summary
Cache | Deprecated. As of 3.3; see for details.
CacheConcurrencyStrategy | Deprecated. As of 3.3; see for details.
CacheDataDescription | Describes attributes regarding the type of data to be cached.
CacheProvider | Deprecated. As of 3.3; see for details.
CollectionRegion | Defines the contract for a cache region which will specifically be used to store collection data.
EntityRegion | Defines the contract for a cache region which will specifically be used to store entity data.
GeneralDataRegion | Contract for general-purpose cache regions.
OptimisticCache | A contract for transactional cache implementations which support optimistic locking of items within the cache.
OptimisticCacheSource | Contract for sources of optimistically lockable data sent to the second level cache.
QueryCache | Defines the contract for caches capable of storing query results.
QueryCacheFactory | Defines a factory for query cache instances.
QueryResultsRegion | Defines the contract for a cache region which will specifically be used to store query results.
ReadWriteCache.Lockable |
Region | Defines a contract for accessing a particular named region within the underlying cache implementation.
RegionFactory | Contract for building second level cache regions.
TimestampsRegion | Defines the contract for a cache region which will specifically be used to store entity "update timestamps".
TransactionalDataRegion | Defines contract for regions which hold transactionally-managed data.
TransactionAwareCache | Marker interface for identifying cache impls which are aware of JTA transactions

Class Summary
AbstractJndiBoundCacheProvider | Support for CacheProvider implementations which are backed by caches bound into JNDI namespace.
CacheKey | Allows multiple entity classes / collection roles to be stored in the same cache region.
DelegatingRegionFactory |
EhCache | EHCache plugin for Hibernate EHCache uses a `net.sf.ehcache.store.MemoryStore` and a `net.sf.ehcache.store.DiskStore`.
EhCacheProvider | Cache Provider plugin for ehcache-1.2.
EhCacheRegionFactory |
FilterKey | Allows cached queries to be keyed by enabled filters.
HashtableCache | A lightweight implementation of the `Cache` interface
HashtableCacheProvider | A simple in-memory Hashtable-based cache impl.
NoCacheProvider | Implementation of NoCacheProvider.
NonstrictReadWriteCache | Caches data that is sometimes updated without ever locking the cache.
OSCache |
OSCacheProvider | Support for OpenSymphony OSCache.
QueryKey | A key that identifies a particular query with bound parameter values.
ReadOnlyCache | Caches data that is never updated.
ReadWriteCache | Caches data that is sometimes updated while maintaining the semantics of "read committed" isolation level.
ReadWriteCache.Item | An item of cached data, timestamped with the time it was cached,.
ReadWriteCache.Lock | A soft lock which supports concurrent locking, timestamped with the time it was released
SingletonEhCacheProvider | Singleton cache Provider plugin for Hibernate 3.2 and ehcache-1.2.
SingletonEhCacheRegionFactory |
StandardQueryCache | The standard implementation of the Hibernate QueryCache interface.
StandardQueryCacheFactory | Standard Hibernate implementation of the QueryCacheFactory interface.
SwarmCache |
SwarmCacheProvider | Support for SwarmCache replicated cache.
Timestamper | Generates increasing identifiers (in a single VM only).
TransactionalCache | Support for fully transactional cache implementations like JBoss TreeCache.
UpdateTimestampsCache | Tracks the timestamps of the most recent updates to particular tables.

Exception Summary
CacheException | Something went wrong in the cache
NoCachingEnabledException | Implementation of NoCachingEnabledException.

## Package org.hibernate.cache Description

This package defines APIs/SPIs and implementations for the Hibernate second-level cache.

The legacy (and now deprecated) approach to caching is defined by the `CacheProvider` and `Cache` interfaces as well as the `CacheConcurrencyStrategy` interface along with the various implementations of all these interfaces. In that scheme, a `CacheProvider` defined how to configure and perform lifecycle operations in regards to a particular underlying caching library; it also defined how to build `Cache` instances which in turn defined how to access the "regions" of the underlying cache instance. For entity and collection data cache regions, `CacheConcurrencyStrategy` wrapped access to those cache regions to apply transactional/concurrent access semantics.

The improved approach is based on `RegionFactory`, the various `Region` specializations and the two access strategies contracts (`EntityRegionAccessStrategy` and `CollectionRegionAccessStrategy`). The general approach here is that `RegionFactory` defined how to configure and perform lifecycle operations in regards to a particular underlying caching library (or libraries). `RegionFactory` also defines how to build specialized `Region` instances based on the type of data we will be storing in that given region. The fact that `RegionFactory` is asked to build specialized regions (as opposed to just general access) is the first improvement over the legacy scheme. The second improvement is the fact that the regions (well the ones like entity and collection regions that are responsible for storing `transactional` data) are asked to build their own access strategies (see `EntityRegion.buildAccessStrategy(org.hibernate.cache.access.AccessType)` and `CollectionRegion.buildAccessStrategy(org.hibernate.cache.access.AccessType)`).

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