Package org.hibernate.cache.access

Defines contracts for transactional and concurrent access to cached entity and collection data.

See:
          Description

Interface Summary
CollectionRegionAccessStrategy Contract for managing transactional and concurrent access to cached collection data.
EntityRegionAccessStrategy Contract for managing transactional and concurrent access to cached entity data.
SoftLock Moved up from inner definition on the now deprecated CacheConcurrencyStrategy.
 

Class Summary
AccessType The types of access strategies available.
 

Package org.hibernate.cache.access Description

Defines contracts for transactional and concurrent access to cached entity and collection data. Transactions pass in a timestamp indicating transaction start time which is then used to protect against concurrent access (exactly how that occurs is based on the actual access-strategy impl used). Two different implementation patterns are provided for.

The asynchronous access strategies are: read-only, read-write and nonstrict-read-write. The only synchronous access strategy is transactional.

Note that, for an asynchronous cache, cache invalidation must be a two step process (lock->unlock or lock->afterUpdate), since this is the only way to guarantee consistency with the database for a nontransactional cache implementation. For a synchronous cache, cache invalidation is a single step process (evict or update). Hence, these contracts (org.hibernate.cache.access.EntityRegionAcessStrategy and CollectionRegionAccessStrategy) define a three step process to cater for both models (see the individual contracts for details).

Note that query result caching does not go through an access strategy; those caches are managed directly against the underlying QueryResultsRegion.



Copyright © 2009 Hibernate.org. All Rights Reserved.