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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.broker.cache

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.ojb.broker.cache .ObjectCache

All known Subclasses:   org.apache.ojb.otm.core .ConcreteEditingContext,  org.apache.ojb.broker.cache .ObjectCacheLocalDefaultImpl,  xdoclet.modules.ojb.tests .TestObjectCache,  org.apache.ojb.broker.cache .ObjectCachePerBrokerImpl,  org.apache.ojb.broker.cache .ObjectCacheJCSImpl,  org.apache.ojb.broker.cache .ObjectCacheEmptyImpl,  org.apache.ojb.broker.cache .ObjectCacheSoftImpl,  org.apache.ojb.broker.cache .AbstractMetaCache,
ObjectCache
public interface ObjectCache (Code)
The ObjectCache stores all Objects loaded by the org.apache.ojb.broker.PersistenceBroker from a DB. When the PersistenceBroker tries to get an Object by its Primary key values it first lookups the cache if the object has been already loaded and cached.

Using an ObjectCache has several advantages: - it increases performance as it reduces DB lookups. - it allows to perform circular lookups (as by crossreferenced objects) that would result in non-terminating loops without such a cache. This will be internally handled by OJB, no need to take care of this. - it maintains the uniqueness of objects as any Db row will be mapped to exactly one object.

This interface allows to have userdefined Cache implementations. The ObjectCacheFactory is responsible for generating cache instances. by default it uses the OJB ObjectCacheDefaultImpl .

Note: Each org.apache.ojb.broker.PersistenceBroker was associated with its own ObjectCache instance at creation time.
ObjectCacheFactory is responsible for creating ObjectCache instances. To make the ObjectCache implementation work, a constructor with org.apache.ojb.broker.PersistenceBroker and java.util.Properties as arguments or only PersistenceBroker argument is needed.
author:
   Thomas Mahler
author:
   Armin Waibel
version:
   $Id: ObjectCache.java,v 1.9.2.3 2005/12/21 22:24:15 tomdz Exp $

Method Summary
public void cache(Identity oid, Object obj)
     Used to cache objects by it's org.apache.ojb.broker.Identity .
public void clear()
     Clear the cache.
public Object lookup(Identity oid)
     Lookup object with Identity 'oid' in cache.
Parameters:
  oid - Identity of the object to search for.
public void remove(Identity oid)
     Removes an Object from the cache.

Method Detail
cache
public void cache(Identity oid, Object obj)(Code)
Used to cache objects by it's org.apache.ojb.broker.Identity .
Parameters:
  oid - Identity of the object to cache.
Parameters:
  obj - The object to cache.

clear
public void clear()(Code)
Clear the cache.

lookup
public Object lookup(Identity oid)(Code)
Lookup object with Identity 'oid' in cache.
Parameters:
  oid - Identity of the object to search for. The cached object or null if no matching object forspecified org.apache.ojb.broker.Identity is found.

remove
public void remove(Identity oid)(Code)
Removes an Object from the cache.
Parameters:
  oid - Identity of the object to be removed.

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