io.undertow.server.handlers.cache

Class LRUCache<K,V>

java.lang.Object

io.undertow.server.handlers.cache.LRUCache<K,V>

public class LRUCache<K,V>
extends Object

A non-blocking cache where entries are indexed by a key.

To reduce contention, entry allocation and eviction execute in a sampling fashion (entry hits modulo N). Eviction follows an LRU approach (oldest sampled entries are removed first) when the cache is out of capacity.

This cache can also be configured to run in FIFO mode, rather than LRU.

Author:

Jason T. Greene, Stuart Douglas

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LRUCache.CacheEntry<K,V>

Constructor Summary

Constructors

Constructor and Description
LRUCache(int maxEntries, int maxAge)
LRUCache(int maxEntries, int maxAge, boolean fifo)

Method Summary

Modifier and Type	Method and Description
void	add(K key, V newValue)
void	clear()
V	get(K key)
V	remove(K key)

Methods inherited from class java.lang.Object

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

Constructor Detail

LRUCache

public LRUCache(int maxEntries,
                int maxAge)

LRUCache

public LRUCache(int maxEntries,
                int maxAge,
                boolean fifo)

Method Detail

add

public void add(K key,
                V newValue)

get

public V get(K key)

remove

public V remove(K key)

clear

public void clear()