org.forgerock.openam.utils.collections

Class LeastRecentlyUsed<T,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<T,V>

org.forgerock.openam.utils.collections.LeastRecentlyUsed<T,V>

Type Parameters:

T - The cache key type.

V - The cache value type.

All Implemented Interfaces:

Serializable, Cloneable, Map<T,V>

public class LeastRecentlyUsed<T,V>
extends LinkedHashMap<T,V>

A simple Least Recently Used cache implementation based on the standard Java SDK LinkedHashMap class.

Specially maintains a cache up to the size limit specified. After which point will start to discard entries in Least Recently Used order.

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
LeastRecentlyUsed(int maxSize) Constructs a new LeastRecentlyUsed cache.

Method Summary

Modifier and Type	Method and Description
int	getMaxSize() Get the maximum size of the cache.
protected boolean	removeEldestEntry(Map.Entry<T,V> entry)

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

LeastRecentlyUsed

public LeastRecentlyUsed(int maxSize)

Constructs a new LeastRecentlyUsed cache.

Parameters:

maxSize - The maximum size of the cache.

Method Detail

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<T,V> entry)

Overrides:

removeEldestEntry in class LinkedHashMap<T,V>

getMaxSize

public int getMaxSize()

Get the maximum size of the cache.

Returns:

the maximum size of the cache.