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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 .ObjectCacheLocalDefaultImpl

ObjectCacheLocalDefaultImpl

public class ObjectCacheLocalDefaultImpl implements ObjectCache(Code)

Simple, flexible local ObjectCache implementation using a java.util.HashMap to cache given objects.

The cache uses soft-references which allows objects (softly) referenced by the cache to be reclaimed by the Java Garbage Collector when they are not longer referenced elsewhere.

NOTE: Handle with care! If multiple PB instances are used (OJB standard behavior) you will run into synchronization problems.

Implementation configuration properties:

Property Key	Property Values
timeout	Lifetime of the cached objects in seconds. If expired the cached object was not returned on lookup call (and removed from cache).

author:
   Thomas Mahler
author:
   Armin Waibel
version:
   $Id: ObjectCacheLocalDefaultImpl.java,v 1.5.2.2 2005/12/21 22:24:15 tomdz Exp $

Inner Class :class CacheEntry

Field Summary
protected Map	objectTable

Constructor Summary
public	ObjectCacheLocalDefaultImpl(PersistenceBroker broker, Properties prop)

Method Summary
public void	cache(Identity oid, Object obj) Makes object persistent to the Objectcache.
public boolean	cacheIfNew(Identity oid, Object obj)
public void	clear() Clear ObjectCache.
public Object	lookup(Identity oid) Lookup object with Identity oid in objectTable.
public void	remove(Identity oid) Removes an Object from the cache.
public String	toString()

Field Detail

objectTable
protected Map objectTable(Code)
	the hashtable holding all cached object

Constructor Detail

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

Method Detail

cache
public void cache(Identity oid, Object obj)(Code)
	Makes object persistent to the Objectcache. I'm using soft-references to allow gc reclaim unused objects even if they are still cached.

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

clear
public void clear()(Code)
	Clear ObjectCache. I.e. remove all entries for classes and objects.

lookup
public Object lookup(Identity oid)(Code)
	Lookup object with Identity oid in objectTable. Returns null if no matching id is found

remove
public void remove(Identity oid)(Code)
	Removes an Object from the cache.

toString
public String toString()(Code)

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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