org.deltava.util.cache
Class AgingCache<T extends Cacheable>

java.lang.Object
  org.deltava.util.cache.Cache<T>
      org.deltava.util.cache.AgingCache<T>

public class AgingCache<T extends Cacheable>
extends Cache<T>

An object cache that supports creation dates. The major difference between this cache and a ExpiringCache is that this cache does not purge an entry until the cache overflows, whereas an ExpiringCache invalidates data based on age.

Since:

1.0

Version:

3.1

Author:

Luke

Nested Class Summary

protected class	AgingCache.AgingCacheEntry<U extends Cacheable> A cache entry for Aging caches.
protected class	AgingCache.AgingNullCacheEntry<U extends Cacheable> A null cache entry for Aging caches.

Field Summary

protected long

_lastCreationTime

Fields inherited from class org.deltava.util.cache.Cache

_cache

Constructor Summary

AgingCache(int maxSize)
Creates a new aging cache.

Method Summary

protected void	addEntry(T obj) Adds an entry to the cache.
protected void	addNullEntry(Object key) Adds a null entry to the cache.
T	get(Object key) Returns an entry from the cache.

Methods inherited from class org.deltava.util.cache.Cache

add, addAll, addNull, checkOverflow, clear, contains, getHits, getMaxSize, getRequests, hit, remove, request, setMaxSize, size

Methods inherited from class java.lang.Object

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

Field Detail

_lastCreationTime

protected long _lastCreationTime

Constructor Detail

AgingCache

public AgingCache(int maxSize)

Creates a new aging cache.

Parameters:

maxSize - the maximum size of the cache

Throws:

IllegalArgumentException - if maxSize is zero or negative

See Also:

Cache.setMaxSize(int)

Method Detail

addEntry

protected void addEntry(T obj)

Adds an entry to the cache.

Specified by:

addEntry in class Cache<T extends Cacheable>

Parameters:

obj - the entry to add to the cache

addNullEntry

protected void addNullEntry(Object key)

Adds a null entry to the cache.

Specified by:

addNullEntry in class Cache<T extends Cacheable>

Parameters:

key - the entry key

get

public T get(Object key)

Returns an entry from the cache.

Specified by:

get in class Cache<T extends Cacheable>

Parameters:

key - the cache key

Returns:

the cache entry, or null if not present