net.sf.jso.cache
Class LRUCache

java.lang.Object
  net.sf.jso.cache.LRUCache

All Implemented Interfaces:

Cache, CacheInfo

public class LRUCache

extends java.lang.Object

implements Cache, CacheInfo

Constructor Summary

LRUCache(int sz)

Method Summary

long	accesses() Informs how many times the cache has been accessed through Cache.get() method.
java.lang.String	algorithm() Informs the algorithm used by the cache for entry management.
java.lang.String	description() Informs a description of the entry management algorithm.
java.lang.Object	get(java.lang.Object key) Gets an object in the cache.
CacheInfo	getCacheInfo() Gets cache information.
long	hits() Informs how many times the cache could return a valid object associated with a key through Cache.get() method.
int	inUse() Informs the cache usage.
void	invalidate() Invalidates all cached objects.
long	misses() Informs how many times the cache could not find any object associated with a key through Cache.get() method.
java.lang.Object	put(java.lang.Object key, java.lang.Object obj) Puts an object in the cache.
int	size() Informs the cache size.

Methods inherited from class java.lang.Object

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

Constructor Detail

LRUCache

public LRUCache(int sz)

Method Detail

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object obj)

Description copied from interface: Cache

Puts an object in the cache.

Specified by:

put in interface Cache

Parameters:

key - A key with which the specified object is to be associated.

obj - An object to be associated with the specified key.

get

public java.lang.Object get(java.lang.Object key)

Description copied from interface: Cache

Gets an object in the cache.

Specified by:

get in interface Cache

Parameters:

key - The key to which the object is associated.

Returns:

If an object associated with the supplied key is found this object is returned. Otherwise null is returned.

invalidate

public void invalidate()

Description copied from interface: Cache

Invalidates all cached objects.

Specified by:

invalidate in interface Cache

getCacheInfo

public CacheInfo getCacheInfo()

Description copied from interface: Cache

Gets cache information.

Specified by:

getCacheInfo in interface Cache

Returns:

Information about the cache.

accesses

public long accesses()

Description copied from interface: CacheInfo

Informs how many times the cache has been accessed through Cache.get() method.

Specified by:

accesses in interface CacheInfo

Returns:

The total number of accesses.

hits

public long hits()

Description copied from interface: CacheInfo

Informs how many times the cache could return a valid object associated with a key through Cache.get() method.

Specified by:

hits in interface CacheInfo

Returns:

The number of times the cache returned valid objects.

misses

public long misses()

Description copied from interface: CacheInfo

Informs how many times the cache could not find any object associated with a key through Cache.get() method.

Specified by:

misses in interface CacheInfo

Returns:

The number of times the cache did not return valid objects.

size

public int size()

Description copied from interface: CacheInfo

Informs the cache size.

Specified by:

size in interface CacheInfo

Returns:

The number of entries the cache is able to manage.

inUse

public int inUse()

Description copied from interface: CacheInfo

Informs the cache usage.

Specified by:

inUse in interface CacheInfo

Returns:

The number of entries are in use by the cache.

algorithm

public java.lang.String algorithm()

Description copied from interface: CacheInfo

Informs the algorithm used by the cache for entry management.

Specified by:

algorithm in interface CacheInfo

Returns:

The name (acronym) of the algorithm.

description

public java.lang.String description()

Description copied from interface: CacheInfo

Informs a description of the entry management algorithm.

Specified by:

description in interface CacheInfo

Returns:

A description (complete name, functional description) of the algorithm.