com.nutiteq.cache
Class MemoryCache

java.lang.Object
  com.nutiteq.cache.MemoryCache

All Implemented Interfaces:

Cache

public class MemoryCache
extends java.lang.Object
implements Cache

Memory cache implementing LRU (least recently used) strategy. If cache is full, least recently used items will be pushed out.

Current implementation uses only actual data size. Objects/keys overhead is not calculated in cache size.

Field Summary

Fields inherited from interface com.nutiteq.cache.Cache

CACHE_LEVEL_MEMORY, CACHE_LEVEL_NONE, CACHE_LEVEL_PERSISTENT

Constructor Summary

MemoryCache(int cacheSize)
Create a new MemoryCache instance.

Method Summary

void	cache(java.lang.String cacheId, byte[] data, int cacheLevel) Cache given data
boolean	contains(java.lang.String cacheKey) Does this cache contain data for given cache key
boolean	contains(java.lang.String cacheKey, int cacheLevel) Does the specified cache level contain given cache key
void	deinitialize() Clean up cache resources and, if needed, write cache definition/index somewhere.
byte[]	get(java.lang.String cacheId) Get cached data.
void	initialize() Initialize needed resources for cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryCache

public MemoryCache(int cacheSize)

Create a new MemoryCache instance.

Parameters:

cacheSize - cache size in bytes.

Method Detail

initialize

public void initialize()

Description copied from interface: Cache

Initialize needed resources for cache. For example read cache index.

Specified by:

initialize in interface Cache

deinitialize

public void deinitialize()

Description copied from interface: Cache

Clean up cache resources and, if needed, write cache definition/index somewhere.

Specified by:

deinitialize in interface Cache

get

public byte[] get(java.lang.String cacheId)

Description copied from interface: Cache

Get cached data.

Specified by:

get in interface Cache

Parameters:

cacheId - key that was used for data caching

Returns:

cached data

cache

public void cache(java.lang.String cacheId,
                  byte[] data,
                  int cacheLevel)

Description copied from interface: Cache

Cache given data

Specified by:

cache in interface Cache

Parameters:

cacheId - key for the cached data

data - data to be cached

cacheLevel - at which level this data needs to be cached (memory, rms, etc).

contains

public boolean contains(java.lang.String cacheKey)

Description copied from interface: Cache

Does this cache contain data for given cache key

Specified by:

contains in interface Cache

Parameters:

cacheKey - cache key checked

Returns:

if data for key present

contains

public boolean contains(java.lang.String cacheKey,
                        int cacheLevel)

Description copied from interface: Cache

Does the specified cache level contain given cache key

Specified by:

contains in interface Cache

Parameters:

cacheKey - cache key to be checked

cacheLevel - which cache levels to check

Returns:

if data for key present