lumis.portal.cache

Class LRUCache

java.lang.Object

java.util.AbstractMap

com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

lumis.portal.cache.LRUCache

All Implemented Interfaces:

Serializable, Cloneable, Map

public class LRUCache
extends com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

LRU (Least Recently Used) algorithm for the cache.

Implementation based on the LRUCache class.

Since:

8.0.0

Version:

$Revision: 17047 $ $Date: 2015-03-03 14:22:22 +0000 (Tue, 03 Mar 2015) $

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache.Entry, com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache.HashIterator, com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache.KeyIterator, com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache.ValueIterator

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Field Summary

Fields inherited from class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

barrierLock, count, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_MAX_ENTRIES, entrySet, groups, keySet, lastWrite, loadFactor, maxEntries, memoryCaching, NULL, persistenceListener, table, threshold, UNLIMITED, unlimitedDiskCache, values

Constructor Summary

Constructors

Constructor and Description
LRUCache() Constructs an LRU Cache.
LRUCache(int capacity) Constructors a LRU Cache of the specified capacity.

Method Summary

Modifier and Type	Method and Description
protected void	itemPut(Object key) An object was put in the cache.
protected void	itemRemoved(Object key) Remove specified key since that object has been removed from the cache.
protected void	itemRetrieved(Object key) An item was retrieved from the list.
protected Object	removeItem() An item needs to be removed from the cache.

Methods inherited from class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

capacity, clear, clone, contains, containsKey, containsValue, elements, entrySet, findAndRemoveEntry, get, getGroup, getGroupForReading, getGroupsForReading, getMaxEntries, getPersistenceListener, getTableForReading, isEmpty, isMemoryCaching, isOverflowPersistence, isUnlimitedDiskCache, keys, keySet, loadFactor, persistClear, persistRemove, persistRemoveGroup, persistRetrieve, persistRetrieveGroup, persistStore, persistStoreGroup, put, putAll, recordModification, rehash, remove, removeForce, setMaxEntries, setMemoryCaching, setOverflowPersistence, setPersistenceListener, setUnlimitedDiskCache, size, sput, sremove, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

LRUCache

public LRUCache()

Constructs an LRU Cache.

Since:

8.0.0

LRUCache

public LRUCache(int capacity)

Constructors a LRU Cache of the specified capacity.

Parameters:

capacity - The maximum cache capacity.

Since:

8.0.0

Method Detail

itemRetrieved

protected void itemRetrieved(Object key)

An item was retrieved from the list. The LRU implementation moves the retrieved item's key to the front of the list.

Specified by:

itemRetrieved in class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

Parameters:

key - The cache key of the item that was retrieved.

Since:

8.0.0

itemPut

protected void itemPut(Object key)

An object was put in the cache. This implementation adds/moves the key to the end of the list.

Specified by:

itemPut in class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

Parameters:

key - The cache key of the item that was put.

Since:

8.0.0

removeItem

protected Object removeItem()

An item needs to be removed from the cache. The LRU implementation removes the first element in the list (ie, the item that was least-recently accessed).

Specified by:

removeItem in class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

Returns:

The key of whichever item was removed.

Since:

8.0.0

itemRemoved

protected void itemRemoved(Object key)

Remove specified key since that object has been removed from the cache.

Specified by:

itemRemoved in class com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache

Parameters:

key - The cache key of the item that was removed.

Since:

8.0.0