Package org.apache.dubbo.common.utils

Class LRUCache<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<K,V>

org.apache.dubbo.common.utils.LRUCache<K,V>

Type Parameters:

K - key

V - value

All Implemented Interfaces:

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

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

A 'least recently used' cache based on LinkedHashMap.

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	Description
LRUCache()
LRUCache(int maxCapacity)

Method Summary

Modifier and Type	Method	Description
void	clear()
V	computeIfAbsent(K key, Function<? super K,? extends V> fn)
boolean	containsKey(Object key)
V	get(Object key)
int	getMaxCapacity()
void	lock()
V	put(K key, V value)
V	putIfAbsent(K key, V value)
void	releaseLock()
V	remove(Object key)
void	setMaxCapacity(int maxCapacity)
int	size()

Methods inherited from class java.util.LinkedHashMap

containsValue, entrySet, forEach, getOrDefault, keySet, newLinkedHashMap, putFirst, putLast, replaceAll, reversed, sequencedEntrySet, sequencedKeySet, sequencedValues, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfPresent, isEmpty, merge, newHashMap, putAll, remove, replace, replace

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfPresent, equals, hashCode, isEmpty, merge, putAll, remove, replace, replace

Methods inherited from interface java.util.SequencedMap

firstEntry, lastEntry, pollFirstEntry, pollLastEntry

Constructor Details

LRUCache

public LRUCache()

LRUCache

public LRUCache(int maxCapacity)

Method Details

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class HashMap<K,V>

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>

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class HashMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class LinkedHashMap<K,V>

putIfAbsent

public V putIfAbsent(K key,
 V value)

Specified by:

putIfAbsent in interface Map<K,V>

Overrides:

putIfAbsent in class HashMap<K,V>

computeIfAbsent

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

Specified by:

computeIfAbsent in interface Map<K,V>

Overrides:

computeIfAbsent in class HashMap<K,V>

lock

public void lock()

releaseLock

public void releaseLock()

getMaxCapacity

public int getMaxCapacity()

setMaxCapacity

public void setMaxCapacity(int maxCapacity)