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Java Source Code / Java Documentation » J2EE » Expresso » com.jcorporate.expresso.core.cache

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

com.jcorporate.expresso.core.cache .UnOrderedCache

UnOrderedCache

public class UnOrderedCache implements Cache(Code)

Unordered cache is a hash map backed class. As such, access to individual items is relatively quick. However getting all the items in cache is a very slow process, and the order of the items is not guaranteed.

If the size of the unordered cache is specified, then the cache automatically uses the least recently used (LRU) algorithm to determine which items should be removed from the cache.

Unless you need to specifically store arrays of objects then this will be the cache to use for most of your needs. Creation date: (9/7/00 11:47:14 AM)

Constructor Summary
public	UnOrderedCache() UnOrderedCache constructor comment.

Method Summary
public void	addItem(CacheEntry newItem)
public void	clear()
public CacheEntry	getCacheEntry(String itemKey)
public Cacheable	getItem(String itemKey) Get an item as defined by the key.
public int	getItemCount()
public Vector	getItems() Return all the items in a Vector This is a REALLY messy function for unordered caches.
public synchronized String	getName()
public synchronized long	getUsedCount()
public boolean	isOrdered() Retrieve whether the cache instance is an ordered cache [list based] or unordered cache.
public synchronized void	removeItem(Cacheable oldItem)
public void	setItems(java.util.List newItems)
public void	setItems(Vector newItems) Goes through all the new items and adds them to the list.
public synchronized void	setMaxSize(int newMaxSize) Sets the maximum size for the cache.
public synchronized void	setName(String newName)

Constructor Detail

UnOrderedCache
public UnOrderedCache()(Code)
	UnOrderedCache constructor comment.

Method Detail

addItem
public void addItem(CacheEntry newItem)(Code)
	Adds an item to this cache Parameters: newItem - The new item to cache

clear
public void clear()(Code)
	Clear the cache by creating a new map

getCacheEntry
public CacheEntry getCacheEntry(String itemKey)(Code)
	Retrieve the cache entry specified by the item key Parameters: itemKey - the key for the cache entry the resulting cache entry or null if it no longer exists.

getItem
public Cacheable getItem(String itemKey)(Code)
	Get an item as defined by the key. Parameters: itemKey - The item's key `Cacheable` object or null if it doesn't exist in thecache

getItemCount
public int getItemCount()(Code)
	Get the number of items in the cache the number of items in this cache

getItems
public Vector getItems()(Code)
	Return all the items in a Vector This is a REALLY messy function for unordered caches. Use very INFREQUENTLY `java.util.Vector` of all the items.

getName
public synchronized String getName()(Code)
	Returns the name of this cache `java.lang.String` the name of the cache

getUsedCount
public synchronized long getUsedCount()(Code)
	Return the number of times this cache has been accessed the number of times accessed as integer

isOrdered
public boolean isOrdered()(Code)
	Retrieve whether the cache instance is an ordered cache [list based] or unordered cache. [map based] true if the cache is an ordered cache.

removeItem
public synchronized void removeItem(Cacheable oldItem)(Code)
	Removes an item as keyed by the paramter Parameters: oldItem - The item to remove.

setItems
public void setItems(java.util.List newItems) throws CacheException(Code)
	Eventually the new way to set items Parameters: newItems - the new items to add throws: CacheException - upon error

setItems
public void setItems(Vector newItems) throws CacheException(Code)
	Goes through all the new items and adds them to the list. Parameters: newItems - A `java.util.Vector` of new items to add tothe cache list throws: CacheException - if there's an error adding the cache entry items

setMaxSize
public synchronized void setMaxSize(int newMaxSize)(Code)
	Sets the maximum size for the cache. If it is greater than zero then we use an LRU Map instead of a normal hashmap to provide automatic removal of old items. Parameters: newMaxSize - The new maximum size to use for the cache

setName
public synchronized void setName(String newName)(Code)
	Sets the name of the cache Parameters: newName - the new name to set for the cache.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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