de.unibonn.iai.eis.luzzu.cache

Class CacheManager

java.lang.Object

de.unibonn.iai.eis.luzzu.cache.CacheManager

public class CacheManager
extends Object

Author:

Jeremy Debattista The CacheManager class handles all caching operations. The Manager allows for the creation of new thread-safe caches in the system. The CacheManager controls all operations in the cache, expiring items based on an LRU algorithm. The CacheManager is a singleton class and can be invoked via the getInstance() method.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CacheManager()

Method Summary

Modifier and Type	Method and Description
void	addToCache(String cacheName, Object key, CacheObject value) Adds item to a cache.
boolean	cacheExists(String cacheName) Checks if cache exitsts
void	cleanup() This method should be invoked to clear up resources from memory
void	clearCache(String cacheName)
void	createNewCache(String cacheName, int maxItems) Creates a new cache in the cache manager.
boolean	existsInCache(String cacheName, Object key) Checks if a particular object exists in a cache
CacheObject	getFromCache(String cacheName, Object key) Fetches item from a cache and marks it as the most recently used.
static CacheManager	getInstance() Create or return a singleton instance of the CacheManager

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheManager

protected CacheManager()

Method Detail

getInstance

public static CacheManager getInstance()

Create or return a singleton instance of the CacheManager

Returns:

CacheManager instance

createNewCache

public void createNewCache(String cacheName,
                           int maxItems)

Creates a new cache in the cache manager.

Parameters:

cacheName - - Name given to the required cache

maxItems - - Max number of items stored in the cache

addToCache

public void addToCache(String cacheName,
                       Object key,
                       CacheObject value)

Adds item to a cache.

Parameters:

cacheName - - Cache identifier name to which item is being added

key - - An identifiable key for the item added

value - - The cache object added

getFromCache

public CacheObject getFromCache(String cacheName,
                                Object key)

Fetches item from a cache and marks it as the most recently used.

Parameters:

cacheName - - Cache identifier name to which item is being fetched

key - - The identifiable key

Returns:

Returns the object from cache

cacheExists

public boolean cacheExists(String cacheName)

Checks if cache exitsts

Parameters:

cacheName -

Returns:

true if cache exists

existsInCache

public boolean existsInCache(String cacheName,
                             Object key)

Checks if a particular object exists in a cache

Parameters:

cacheName - - Cache identifier name to which item is being fetched

key - - The identifiable key

Returns:

Returns true if the object exists in the cache.

cleanup

public void cleanup()

This method should be invoked to clear up resources from memory

clearCache

public void clearCache(String cacheName)