org.apache.stratos.lb.common.cache
Class LRUCache<K,V>

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.HashMap<K,V>
          java.util.LinkedHashMap<K,V>
              org.apache.stratos.lb.common.cache.LRUCache<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

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

A simple, thread-safe LRU cache implementation. This cache allows concurrent reads. Concurrent write attempts are synchronized using an exclusive lock.

See Also:

Serialized Form

Nested Class Summary

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

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

Constructor Summary

LRUCache(int maxEntries)

Method Summary

void	clear()
void	exclusiveLock()
V	get(Object key)
protected void	handleRemovableEntry(Map.Entry<K,V> entry)
V	put(K key, V value)
void	release()
V	remove(Object key)
protected boolean	removeEldestEntry(Map.Entry<K,V> eldest)

Methods inherited from class java.util.LinkedHashMap

containsValue

Methods inherited from class java.util.HashMap

clone, containsKey, entrySet, isEmpty, keySet, putAll, size, 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

containsKey, entrySet, equals, hashCode, isEmpty, keySet, putAll, size, values

Constructor Detail

LRUCache

public LRUCache(int maxEntries)

Method Detail

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class LinkedHashMap<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class HashMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class HashMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class LinkedHashMap<K,V>

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<K,V> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>

handleRemovableEntry

protected void handleRemovableEntry(Map.Entry<K,V> entry)

exclusiveLock

public void exclusiveLock()

release

public void release()