org.sourceforge.beanindex.cache
Class SoftReferenceLRUCache

java.lang.Object
  org.sourceforge.beanindex.cache.LRUCache
      org.sourceforge.beanindex.cache.SoftReferenceLRUCache

public final class SoftReferenceLRUCache

extends LRUCache

A simple LRU Cache implementation. It uses int array as a buffer to record the hit timestamp. Also it does not use the System time as the timestamp. To save memory it generates a timestamp of int type. each hit increments the timestamp by one.

Author:

Sakthivel Muthusamy

Field Summary

Fields inherited from class org.sourceforge.beanindex.cache.LRUCache

cacheSize, lastRemoved, LRU_BUFFER_INIT_CAPACITY, LRUBuffer, map, timeStamp

Constructor Summary

SoftReferenceLRUCache()

SoftReferenceLRUCache(int lruBufferCapacity, int cacheSize)
it allocates a LRUBuffer to support all the beans in the repository.

Method Summary

java.lang.Object	get(int beanId) gets the bean out of cache if exists.
void	put(int key, java.lang.Object obj) put the key, value pair in to cache.

Methods inherited from class org.sourceforge.beanindex.cache.LRUCache

extendLRUBuffer, getLRUCanditatePosition, getTimeStamp, refreshLRUbufferTimeStamp, removeLRUCandidate

Methods inherited from class java.lang.Object

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

Constructor Detail

SoftReferenceLRUCache

public SoftReferenceLRUCache()

SoftReferenceLRUCache

public SoftReferenceLRUCache(int lruBufferCapacity,
                             int cacheSize)

it allocates a LRUBuffer to support all the beans in the repository. limit is applied at runtime for the cache only.

Parameters:

lruBufferCapacity -

cacheSize -

Method Detail

get

public final java.lang.Object get(int beanId)

gets the bean out of cache if exists. It updates the LRUbuffer with the recent timestamp if the bean exists in cache.

Specified by:

get in class LRUCache

Parameters:

beanId -

Returns:

Object

put

public final void put(int key,
                      java.lang.Object obj)

put the key, value pair in to cache. Note the id is a primitivie type. This helps to index the LRUbuffer easily.

Specified by:

put in class LRUCache

Parameters:

key -

obj -