cn.hutool.cache.impl

Class FIFOCache<K,V>

java.lang.Object

cn.hutool.cache.impl.AbstractCache<K,V>

cn.hutool.cache.impl.StampedCache<K,V>

cn.hutool.cache.impl.FIFOCache<K,V>

Type Parameters:

K - 键类型

V - 值类型

All Implemented Interfaces:

Cache<K,V>, Serializable, Iterable<V>

public class FIFOCache<K,V>
extends StampedCache<K,V>

FIFO(first in first out) 先进先出缓存.

元素不停的加入缓存直到缓存满为止，当缓存满时，清理过期缓存对象，清理后依旧满则删除先入的缓存（链表首部对象）
优点：简单快速
缺点：不灵活，不能保证最常用的对象总是被保留

Author:

Looly

See Also:

Serialized Form

Field Summary

Fields inherited from class cn.hutool.cache.impl.StampedCache

lock

Fields inherited from class cn.hutool.cache.impl.AbstractCache

cacheMap, capacity, existCustomTimeout, hitCount, keyLockMap, listener, missCount, timeout

Constructor Summary

Constructors

Constructor and Description
FIFOCache(int capacity) 构造，默认对象不过期
FIFOCache(int capacity, long timeout) 构造

Method Summary

Modifier and Type	Method and Description
protected int	pruneCache() 先进先出的清理策略 先遍历缓存清理过期的缓存对象，如果清理后还是满的，则删除第一个缓存对象

Methods inherited from class cn.hutool.cache.impl.StampedCache

cacheObjIterator, clear, containsKey, get, prune, put, remove

Methods inherited from class cn.hutool.cache.impl.AbstractCache

cacheObjIter, capacity, get, get, getHitCount, getMissCount, getWithoutLock, isEmpty, isFull, isPruneExpiredActive, iterator, keySet, onRemove, put, putWithoutLock, removeWithoutLock, setListener, size, timeout, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface cn.hutool.cache.Cache

get, get

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

FIFOCache

public FIFOCache(int capacity)

构造，默认对象不过期

Parameters:

capacity - 容量

FIFOCache

public FIFOCache(int capacity,
                 long timeout)

构造

Parameters:

capacity - 容量

timeout - 过期时长

Method Detail

pruneCache

protected int pruneCache()

先进先出的清理策略
先遍历缓存清理过期的缓存对象，如果清理后还是满的，则删除第一个缓存对象

Specified by:

pruneCache in class AbstractCache<K,V>

Returns:

清理数