Package rocks.xmpp.util.cache

Class LruCache<K,V>

java.lang.Object

rocks.xmpp.util.cache.LruCache<K,V>

Type Parameters:

K - The key.

V - The value.

All Implemented Interfaces:

Map<K,V>

public final class LruCache<K,V>
extends Object
implements Map<K,V>

A simple concurrent implementation of a least-recently-used cache.

This cache is keeps a maximal number of items in memory and removes the least-recently-used item, when new items are added.

See Also:

http://javadecodedquestions.blogspot.de/2013/02/java-cache-static-data-loading.html, http://stackoverflow.com/a/22891780

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
LruCache(int maxEntries)

Method Summary

Modifier and Type	Method	Description
void	clear()
V	compute(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)
V	computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)
V	computeIfPresent(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
boolean	isEmpty()
Set<K>	keySet()
V	merge(K key, V value, BiFunction<? super V,? super V,? extends V> remappingFunction)
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	putIfAbsent(K key, V value)
V	remove(Object key)
boolean	remove(Object key, Object value)
V	replace(K key, V value)
boolean	replace(K key, V oldValue, V newValue)
int	size()
Collection<V>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, forEach, getOrDefault, hashCode, replaceAll

Constructor Detail

LruCache

public LruCache(int maxEntries)

Method Detail

size

public final int size()

Specified by:

size in interface Map<K,V>

isEmpty

public final boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

containsKey

public final boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public final boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

get

public final V get(Object key)

Specified by:

get in interface Map<K,V>

remove

public final V remove(Object key)

Specified by:

remove in interface Map<K,V>

remove

public final boolean remove(Object key,
                            Object value)

Specified by:

remove in interface Map<K,V>

putAll

public final void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

put

public final V put(K key,
                   V value)

Specified by:

put in interface Map<K,V>

clear

public final void clear()

Specified by:

clear in interface Map<K,V>

keySet

public final Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

values

public final Collection<V> values()

Specified by:

values in interface Map<K,V>

entrySet

public final Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

putIfAbsent

public final V putIfAbsent(K key,
                           V value)

Specified by:

putIfAbsent in interface Map<K,V>

replace

public final boolean replace(K key,
                             V oldValue,
                             V newValue)

Specified by:

replace in interface Map<K,V>

replace

public final V replace(K key,
                       V value)

Specified by:

replace in interface Map<K,V>

computeIfAbsent

public final V computeIfAbsent(K key,
                               Function<? super K,? extends V> mappingFunction)

Specified by:

computeIfAbsent in interface Map<K,V>

computeIfPresent

public final V computeIfPresent(K key,
                                BiFunction<? super K,? super V,? extends V> remappingFunction)

Specified by:

computeIfPresent in interface Map<K,V>

compute

public final V compute(K key,
                       BiFunction<? super K,? super V,? extends V> remappingFunction)

Specified by:

compute in interface Map<K,V>

merge

public final V merge(K key,
                     V value,
                     BiFunction<? super V,? super V,? extends V> remappingFunction)

Specified by:

merge in interface Map<K,V>