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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)

java.lang .Object

org.apache.ojb.broker.cache .ObjectCacheTwoLevelImpl

ObjectCacheTwoLevelImpl

public class ObjectCacheTwoLevelImpl implements ObjectCacheInternal,PBStateListener(Code)

A two-level ObjectCache implementation with a session- and an application cache. The application cache could be specified by the property applicationCache.

The first level is a transactional session cache which cache objects till org.apache.ojb.broker.PersistenceBroker.close or if a PB-tx is running till org.apache.ojb.broker.PersistenceBroker.abortTransaction or org.apache.ojb.broker.PersistenceBroker.commitTransaction . On commit all objects written to database will be pushed to the application cache.

The session cache act as a temporary storage for all read/store operations of persistent objects and only on commit or close of the used PB instance the buffered objects of type ObjectCacheTwoLevelImpl.TYPE_WRITE will be written to the application cache. Except objects of type ObjectCacheTwoLevelImpl.TYPE_NEW_MATERIALIZED these objects will be immediatly pushed to application cache.

The application cache

Property Key Property Values

applicationCache Specifies the ObjectCache implementation used as application cache (second level cache). By default ObjectCacheDefaultImpl was used. It's recommended to use a shared cache implementation (all used PB instances should access the same pool of objects - e.g. by using a static Map in cache implementation).

copyStrategy Specifies the implementation class of the ObjectCacheTwoLevelImpl.CopyStrategy interface, which was used to copy objects on read and write to application cache. If not specified a default implementation based was used ( ObjectCacheTwoLevelImpl.CopyStrategyImpl make field-descriptor based copies of the cached objects).

forceProxies If true on materialization of cached objects, all referenced objects will be represented by proxy objects (independent from the proxy settings in reference- or collection-descriptor).
Note: To use this feature all persistence capable objects have to be interface based or the ProxyFactory and IndirectionHandler implementation classes supporting dynamic proxy enhancement for all classes (see OJB.properties file).

version:
$Id: ObjectCacheTwoLevelImpl.java,v 1.1.2.16 2005/12/21 22:24:15 tomdz Exp $

Inner Class :final static class CacheEntry extends SoftReference implements Serializable

Inner Class :public interface CopyStrategy

Inner Class :public static class CopyStrategyImpl implements CopyStrategy

Field Summary
final public static String	APPLICATION_CACHE_PROP
final public static String	COPY_STRATEGY_PROP
final public static String	FORCE_PROXIES

Constructor Summary
public	ObjectCacheTwoLevelImpl(PersistenceBroker broker, Properties prop)

Method Summary
public void	afterBegin(PBStateEvent event)
public void	afterCommit(PBStateEvent event) After committing the transaction push the object from session cache ( 1st level cache) to the application cache (2d level cache).
public void	afterOpen(PBStateEvent event)
public void	afterRollback(PBStateEvent event)
public void	beforeBegin(PBStateEvent event)
public void	beforeClose(PBStateEvent event)
public void	beforeCommit(PBStateEvent event)
public void	beforeRollback(PBStateEvent event)
public void	cache(Identity oid, Object obj) Put the specified object to session cache.
public boolean	cacheIfNew(Identity oid, Object obj)
public void	clear() Clear session cache and application cache.
public void	doInternalCache(Identity oid, Object obj, int type) Cache the given object.
public ObjectCacheInternal	getApplicationCache() Returns the application cache that this 2-level cache uses.
public PersistenceBrokerImpl	getBroker() Returns the org.apache.ojb.broker.PersistenceBroker instance associated with this cache instance.
public Object	lookup(Identity oid) Lookup corresponding object from session cache or if not found from the underlying real ObjectCache - Return null if no object was found.
public void	materializeFullObject(Object target) This cache implementation cache only "flat" objects (persistent objects without any references), so when ObjectCacheTwoLevelImpl.lookup(org.apache.ojb.broker.Identity) a cache object it needs full materialization (assign all referenced objects) before the cache returns the object.
public void	remove(Identity oid) Remove the corresponding object from session AND application cache.
public void	resetSessionCache() Discard all session cached objects and reset the state of this class for further usage.

Field Detail

APPLICATION_CACHE_PROP
final public static String APPLICATION_CACHE_PROP(Code)

COPY_STRATEGY_PROP
final public static String COPY_STRATEGY_PROP(Code)

FORCE_PROXIES
final public static String FORCE_PROXIES(Code)

Constructor Detail

ObjectCacheTwoLevelImpl
public ObjectCacheTwoLevelImpl(PersistenceBroker broker, Properties prop)(Code)

Method Detail

afterBegin
public void afterBegin(PBStateEvent event)(Code)

afterCommit
public void afterCommit(PBStateEvent event)(Code)
	After committing the transaction push the object from session cache ( 1st level cache) to the application cache (2d level cache). Finally, clear the session cache.

afterOpen
public void afterOpen(PBStateEvent event)(Code)

afterRollback
public void afterRollback(PBStateEvent event)(Code)

beforeBegin
public void beforeBegin(PBStateEvent event)(Code)

beforeClose
public void beforeClose(PBStateEvent event)(Code)
	Before closing the PersistenceBroker ensure that the session cache is cleared

beforeCommit
public void beforeCommit(PBStateEvent event)(Code)

beforeRollback
public void beforeRollback(PBStateEvent event)(Code)
	Before rollbacking clear the session cache (first level cache)

cache
public void cache(Identity oid, Object obj)(Code)
	Put the specified object to session cache.

cacheIfNew
public boolean cacheIfNew(Identity oid, Object obj)(Code)

clear
public void clear()(Code)
	Clear session cache and application cache.

doInternalCache
public void doInternalCache(Identity oid, Object obj, int type)(Code)
	Cache the given object. Creates a org.apache.ojb.broker.cache.ObjectCacheTwoLevelImpl.CacheEntry and put it to session cache. If the specified object to cache is of type ObjectCacheTwoLevelImpl.TYPE_NEW_MATERIALIZED it will be immediately pushed to the application cache.

getApplicationCache
public ObjectCacheInternal getApplicationCache()(Code)
	Returns the application cache that this 2-level cache uses. The application cache

getBroker
public PersistenceBrokerImpl getBroker()(Code)
	Returns the org.apache.ojb.broker.PersistenceBroker instance associated with this cache instance.

lookup
public Object lookup(Identity oid)(Code)
	Lookup corresponding object from session cache or if not found from the underlying real ObjectCache - Return null if no object was found.

materializeFullObject
public void materializeFullObject(Object target)(Code)
	This cache implementation cache only "flat" objects (persistent objects without any references), so when ObjectCacheTwoLevelImpl.lookup(org.apache.ojb.broker.Identity) a cache object it needs full materialization (assign all referenced objects) before the cache returns the object. The materialization of the referenced objects based on the auto-XXX settings specified in the metadata mapping. Override this method if needed in conjunction with a user-defined org.apache.ojb.broker.cache.ObjectCacheTwoLevelImpl.CopyStrategy . Parameters: target - The "flat" object for full materialization

remove
public void remove(Identity oid)(Code)
	Remove the corresponding object from session AND application cache.

resetSessionCache
public void resetSessionCache()(Code)
	Discard all session cached objects and reset the state of this class for further usage.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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