org.apache.commons.jcs.engine.memory.lru

Class LHMLRUMemoryCache<K,V>

java.lang.Object

org.apache.commons.jcs.engine.memory.AbstractMemoryCache<K,V>

org.apache.commons.jcs.engine.memory.lru.LHMLRUMemoryCache<K,V>

All Implemented Interfaces:

IMemoryCache<K,V>

public class LHMLRUMemoryCache<K,V>
extends AbstractMemoryCache<K,V>

This is a test memory manager using the jdk1.4 LinkedHashMap.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	LHMLRUMemoryCache.LHMSpooler Implementation of removeEldestEntry in LinkedHashMap

Field Summary

Fields inherited from class org.apache.commons.jcs.engine.memory.AbstractMemoryCache

chunkSize, hitCnt, lock, map, missCnt, putCnt

Constructor Summary

Constructors

Constructor and Description
LHMLRUMemoryCache()

Method Summary

Modifier and Type	Method and Description
Map<K,MemoryElementDescriptor<K,V>>	createMap() Returns a synchronized LHMSpooler
void	dumpCacheEntries() Dump the cache entries from first to last for debugging.
int	freeElements(int numberToFree) This can't be implemented.
ICacheElement<K,V>	get(K key) Get an item from the cache
Set<K>	getKeySet() Get an Array of the keys for all elements in the memory cache
IStats	getStatistics() This returns semi-structured information on the memory cache, such as the size, put count, hit count, and miss count.
void	initialize(CompositeCache<K,V> hub) For post reflection creation initialization
boolean	remove(K key) Removes an item from the cache.
void	update(ICacheElement<K,V> ce) Puts an item to the cache.

Methods inherited from class org.apache.commons.jcs.engine.memory.AbstractMemoryCache

dispose, dumpMap, getCacheAttributes, getCacheName, getCompositeCache, getMultiple, getQuiet, getSize, getStatus, removeAll, setCacheAttributes, waterfal

Methods inherited from class java.lang.Object

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

Constructor Detail

LHMLRUMemoryCache

public LHMLRUMemoryCache()

Method Detail

initialize

public void initialize(CompositeCache<K,V> hub)

For post reflection creation initialization

Specified by:

initialize in interface IMemoryCache<K,V>

Overrides:

initialize in class AbstractMemoryCache<K,V>

Parameters:

hub -

createMap

public Map<K,MemoryElementDescriptor<K,V>> createMap()

Returns a synchronized LHMSpooler

Specified by:

createMap in class AbstractMemoryCache<K,V>

Returns:

Collections.synchronizedMap( new LHMSpooler() )

update

public void update(ICacheElement<K,V> ce)
            throws IOException

Puts an item to the cache.

Specified by:

update in interface IMemoryCache<K,V>

Specified by:

update in class AbstractMemoryCache<K,V>

Parameters:

ce - Description of the Parameter

Throws:

IOException

get

public ICacheElement<K,V> get(K key)
                       throws IOException

Get an item from the cache

Specified by:

get in interface IMemoryCache<K,V>

Specified by:

get in class AbstractMemoryCache<K,V>

Parameters:

key - Identifies item to find

Returns:

ICacheElement<K, V> if found, else null

Throws:

IOException

remove

public boolean remove(K key)
               throws IOException

Removes an item from the cache. This method handles hierarchical removal. If the key is a String and ends with the CacheConstants.NAME_COMPONENT_DELIMITER, then all items with keys starting with the argument String will be removed.

Specified by:

remove in interface IMemoryCache<K,V>

Specified by:

remove in class AbstractMemoryCache<K,V>

Parameters:

key -

Returns:

true if removed

Throws:

IOException

getKeySet

public Set<K> getKeySet()

Get an Array of the keys for all elements in the memory cache

Specified by:

getKeySet in interface IMemoryCache<K,V>

Specified by:

getKeySet in class AbstractMemoryCache<K,V>

Returns:

An Object[]

getStatistics

public IStats getStatistics()

This returns semi-structured information on the memory cache, such as the size, put count, hit count, and miss count.

Specified by:

getStatistics in interface IMemoryCache<K,V>

Overrides:

getStatistics in class AbstractMemoryCache<K,V>

Returns:

IStats

dumpCacheEntries

public void dumpCacheEntries()

Dump the cache entries from first to last for debugging.

freeElements

public int freeElements(int numberToFree)
                 throws IOException

This can't be implemented.

Parameters:

numberToFree -

Returns:

0

Throws:

IOException