net.sourceforge.jtds.jdbc.cache

Class SimpleLRUCache<K,V>

java.lang.Object

net.sourceforge.jtds.jdbc.cache.SimpleLRUCache<K,V>

public class SimpleLRUCache<K,V>
extends java.lang.Object

Simple LRU cache for any type of object, based on a LinkedHashMap with a maximum size.

Author:

Holger Rehn

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map<K,V>	_Map map backing the LRU cache

Constructor Summary

Constructors

Constructor and Description
SimpleLRUCache(int limit) Constructs a new LRU cache with a limited capacity.

Method Summary

Methods

Modifier and Type	Method and Description
V	get(K key) Get the value associated with the given key, if any.
V	put(K key, V value) Updates the LRU cache by adding a new entry.

Methods inherited from class java.lang.Object

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

Field Detail

_Map

private final java.util.Map<K,V> _Map

map backing the LRU cache

Constructor Detail

SimpleLRUCache

public SimpleLRUCache(int limit)

Constructs a new LRU cache with a limited capacity.

Parameters:

limit - maximum number of entries in this cache

Method Detail

put

public V put(K key,
    V value)

Updates the LRU cache by adding a new entry.

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

Returns:

previous value associated with key or null if there was no mapping for key; a null value can also indicate that the cache previously associated null with the specified key

See Also:

Map.put(Object,Object)

get

public V get(K key)

Get the value associated with the given key, if any.

Parameters:

key - the key whose associated value is to be returned

Returns:

the value to which the specified key is mapped, or null if this map contains no mapping for the key

See Also:

Map.get(Object)