org.jmage.cache
Class LRUMemoryCache

java.lang.Object
  org.jmage.cache.LRUMemoryCache

All Implemented Interfaces:

Cache

public class LRUMemoryCache
extends java.lang.Object
implements Cache

LRU Cache dismisses the least recently used object in the cache upon adding new ones, once the cache's capacity has been met.

Field Summary

protected int	capacity
protected static org.apache.log4j.Logger	log
protected java.util.LinkedHashMap	pages

Constructor Summary

LRUMemoryCache()

Method Summary

void	destroy() Destroy the cache
protected int	getCapacity()
protected int	getSize()
void	init(java.util.Properties properties) Initialize the cache using Properties
void	pageIn(java.lang.Object key, java.lang.Object object) Pages an object into the cache, affecting it's cache ranking.
java.lang.Object	pageOut(java.lang.Object key) Pages an object out of the cache, affecting it's cache ranking.
void	remove(java.lang.Object object) Removes an object from the cache

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

pages

protected java.util.LinkedHashMap pages

capacity

protected int capacity

log

protected static org.apache.log4j.Logger log

Constructor Detail

LRUMemoryCache

public LRUMemoryCache()

Method Detail

init

public void init(java.util.Properties properties)
          throws CacheException

Description copied from interface: Cache

Initialize the cache using Properties

Specified by:

init in interface Cache

Throws:

CacheException

pageIn

public void pageIn(java.lang.Object key,
                   java.lang.Object object)
            throws CacheException

Description copied from interface: Cache

Pages an object into the cache, affecting it's cache ranking.

Specified by:

pageIn in interface Cache

Parameters:

key - the key

object - the object

Throws:

CacheException

pageOut

public java.lang.Object pageOut(java.lang.Object key)
                         throws CacheException

Description copied from interface: Cache

Pages an object out of the cache, affecting it's cache ranking.

Specified by:

pageOut in interface Cache

Parameters:

key - the object's cache key

Returns:

the object

Throws:

CacheException

remove

public void remove(java.lang.Object object)

Description copied from interface: Cache

Removes an object from the cache

Specified by:

remove in interface Cache

Parameters:

object - the object's cache key

destroy

public void destroy()
             throws CacheException

Description copied from interface: Cache

Destroy the cache

Specified by:

destroy in interface Cache

Throws:

CacheException

getCapacity

protected int getCapacity()

getSize

protected int getSize()