Package com.xxl.tool.cache.impl

Class LRUCache<K,V>

java.lang.Object

com.xxl.tool.cache.impl.ReentrantCache<K,V>

com.xxl.tool.cache.impl.LRUCache<K,V>

All Implemented Interfaces:

Cache<K,V>, Serializable

public class LRUCache<K,V>
extends ReentrantCache<K,V>

LRU (least recently used)最近最久未使用缓存 1、元素持续添加直到存满，触发 清理全部过期对象； 2、清理后缓存仍存满时，最久未被使用的对象将被移除； （此缓存基于LinkedHashMap，因此当被缓存的对象每被访问一次，这个对象的key就到链表头部） 3、优劣势： - 优势：简单、速度快；经常使用的对象，不会被被移除缓存； - 劣势：不能很快的访问缓存中不常用的对象；

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.xxl.tool.cache.impl.ReentrantCache

cacheMap, capacity, expireType, hitCount, listener, loader, missCount, timeout, writeLockCount, writeLockMap

Constructor Summary

Constructors

Constructor	Description
LRUCache(int capacity, long timeout, boolean expireType)

Method Summary

Modifier and Type	Method	Description
protected int	doPrune()	只 清理全部过期对象，LRU的实现会交给LinkedHashMap

Methods inherited from class com.xxl.tool.cache.impl.ReentrantCache

asMap, capacity, clear, containsKey, get, get, getIfPresent, hitCount, isEmpty, isFull, missCount, onRemove, prune, put, remove, removeWithoutLock, setListener, setLoader, size, timeout, toString

Methods inherited from class java.lang.Object

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

Constructor Details

LRUCache

public LRUCache(int capacity,
 long timeout,
 boolean expireType)

Method Details

doPrune

protected int doPrune()

只 清理全部过期对象，LRU的实现会交给LinkedHashMap

Specified by:

doPrune in class ReentrantCache<K,V>

Returns:

清理数据量