org.jmage.cache
Class LRUDiskCache

java.lang.Object
  org.jmage.cache.LRUDiskCache

All Implemented Interfaces:

Cache

public class LRUDiskCache
extends java.lang.Object
implements Cache

A simple disk cache.

Nested Class Summary

static class	LRUDiskCache.CacheFilter
static class	LRUDiskCache.ModificationComparator

Field Summary

protected java.io.File	cacheDir
protected static LRUDiskCache.CacheFilter	cacheFilter
protected int	capacity
protected static org.apache.log4j.Logger	log
protected static LRUDiskCache.ModificationComparator	modificationComparator

Constructor Summary

LRUDiskCache()

Method Summary

void	destroy() Destroy the cache
int	getCapacity()
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 key) 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

capacity

protected int capacity

cacheDir

protected java.io.File cacheDir

cacheFilter

protected static LRUDiskCache.CacheFilter cacheFilter

modificationComparator

protected static LRUDiskCache.ModificationComparator modificationComparator

log

protected static org.apache.log4j.Logger log

Constructor Detail

LRUDiskCache

public LRUDiskCache()

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

getCapacity

public int getCapacity()

getSize

public int getSize()

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 key)
            throws CacheException

Description copied from interface: Cache

Removes an object from the cache

Specified by:

remove in interface Cache

Parameters:

key - the object's cache key

Throws:

CacheException

destroy

public void destroy()
             throws CacheException

Description copied from interface: Cache

Destroy the cache

Specified by:

destroy in interface Cache

Throws:

CacheException