Class LRUCache<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<K,V>

org.apache.activemq.artemis.selector.impl.LRUCache<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

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

A Simple LRU Cache

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class AbstractMap

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

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
protected int	maxCacheSize

Constructor Summary

Constructors

Constructor	Description
LRUCache()	Default constructor for an LRU Cache The default capacity is 10000
LRUCache(int maximumCacheSize)	Constructs a LRUCache with a maximum capacity
LRUCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder)	Constructs an empty LRUCache instance with the specified initial capacity, maximumCacheSize,load factor and ordering mode.

Method Summary

Modifier and Type	Method	Description
int	getMaxCacheSize()
protected void	onCacheEviction(Map.Entry<K,V> eldest)
protected boolean	removeEldestEntry(Map.Entry<K,V> eldest)
void	setMaxCacheSize(int maxCacheSize)

Methods inherited from class LinkedHashMap

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

Methods inherited from class HashMap

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

Methods inherited from class AbstractMap

equals, hashCode, toString

Methods inherited from class Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Map

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

Field Details

maxCacheSize

protected int maxCacheSize

Constructor Details

LRUCache

public LRUCache()

Default constructor for an LRU Cache The default capacity is 10000

LRUCache

public LRUCache(int maximumCacheSize)

Constructs a LRUCache with a maximum capacity

LRUCache

public LRUCache(int initialCapacity,
 int maximumCacheSize,
 float loadFactor,
 boolean accessOrder)

Constructs an empty LRUCache instance with the specified initial capacity, maximumCacheSize,load factor and ordering mode.

Parameters:

initialCapacity - the initial capacity.

loadFactor - the load factor.

accessOrder - the ordering mode - true for access-order, false for insertion-order.

Throws:

IllegalArgumentException - if the initial capacity is negative or the load factor is non-positive.

Method Details

getMaxCacheSize

public int getMaxCacheSize()

setMaxCacheSize

public void setMaxCacheSize(int maxCacheSize)

removeEldestEntry

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

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>

onCacheEviction

protected void onCacheEviction(Map.Entry<K,V> eldest)