br.com.caelum.vraptor.cache

Class LRUCacheStore<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<K,V>

br.com.caelum.vraptor.cache.LRUCacheStore<K,V>

All Implemented Interfaces:

CacheStore<K,V>, Serializable, Cloneable, Map<K,V>

@Vetoed
public class LRUCacheStore<K,V>
extends LinkedHashMap<K,V>
implements CacheStore<K,V>

A LRU cache based on LinkedHashMap.

Author:

Sérgio Lopes, Paulo Silveira

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

Constructors

Constructor and Description
LRUCacheStore(int capacity)

Method Summary

Modifier and Type	Method and Description
V	fetch(K key) Fetches the value under the key
V	fetch(K key, Callable<V> valueProvider) Fetches the value under the key.
protected boolean	removeEldestEntry(Map.Entry<K,V> eldest)
V	write(K key, V value) Writes a value on the cache

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, replaceAll, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

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

compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Constructor Detail

LRUCacheStore

public LRUCacheStore(int capacity)

Method Detail

removeEldestEntry

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

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>

fetch

public V fetch(K key,
               Callable<V> valueProvider)

Description copied from interface: CacheStore

Fetches the value under the key. If no value is set, valueProvider is used to compute a value for the key. Once the value is computed, it is stored on the cache.

Specified by:

fetch in interface CacheStore<K,V>

Returns:

the stored or the new value for the provided key.

write

public V write(K key,
               V value)

Description copied from interface: CacheStore

Writes a value on the cache

Specified by:

write in interface CacheStore<K,V>

Returns:

the previous stored value, null if none.

fetch

public V fetch(K key)

Description copied from interface: CacheStore

Fetches the value under the key

Specified by:

fetch in interface CacheStore<K,V>

Returns:

the stored value for the key, or null.