Package org.deltava.util.cache

Class AgingCache<T extends Cacheable>

java.lang.Object

org.deltava.util.cache.Cache<T>

org.deltava.util.cache.AgingCache<T>

Type Parameters:

T - the Cacheable object type

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:

7.2

Author:

Luke

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	AgingCache.AgingCacheEntry<U extends T>	A cache entry for Aging caches.
protected class	AgingCache.AgingNullCacheEntry<U extends T>	A null cache entry for Aging caches.

Field Summary

Fields

Modifier and Type	Field	Description
protected long	_lastCreationTime

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

_cache

Constructor Summary

Constructors

Constructor	Description
AgingCache(int maxSize)	Creates a new aging cache.

Method Summary

Modifier and Type	Method	Description
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, getErrors, getHits, getMaxSize, getRequests, hit, isRemote, remove, request, setMaxSize, size

Methods inherited from class java.lang.Object

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

Field Details

_lastCreationTime

protected long _lastCreationTime

Constructor Details

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 Details

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