org.jxmpp.util.cache

Class LruCache<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<K,V>

org.jxmpp.util.cache.LruCache<K,V>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<K,V>, Cache<K,V>

public class LruCache<K,V>
extends java.util.LinkedHashMap<K,V>
implements Cache<K,V>

A specialized Map that is size-limited (using an LRU algorithm). The Map is thread-safe.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

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

Constructor Summary

Constructors

Constructor and Description
LruCache(int maxSize) Create a new cache and specify the maximum size of for the cache in bytes, and the maximum lifetime of objects.

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
java.util.Set<java.util.Map.Entry<K,V>>	entrySet()
V	get(java.lang.Object key)
long	getCacheHits()
long	getCacheMisses()
int	getMaxCacheSize()
boolean	isEmpty()
java.util.Set<K>	keySet()
V	put(K key, V value)
void	putAll(java.util.Map<? extends K,? extends V> m)
V	remove(java.lang.Object key)
protected boolean	removeEldestEntry(java.util.Map.Entry<K,V> eldest)
void	setMaxCacheSize(int maxCacheSize)
int	size()
java.util.Collection<V>	values()

Methods inherited from class java.util.HashMap

clone

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

equals, hashCode

Constructor Detail

LruCache

public LruCache(int maxSize)

Create a new cache and specify the maximum size of for the cache in bytes, and the maximum lifetime of objects.

Parameters:

maxSize - the maximum number of objects the cache will hold. -1 means the cache has no max size.

Method Detail

removeEldestEntry

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

Overrides:

removeEldestEntry in class java.util.LinkedHashMap<K,V>

put

public final V put(K key,
    V value)

Specified by:

put in interface java.util.Map<K,V>

Specified by:

put in interface Cache<K,V>

Overrides:

put in class java.util.HashMap<K,V>

get

public final V get(java.lang.Object key)

Specified by:

get in interface java.util.Map<K,V>

Specified by:

get in interface Cache<K,V>

Overrides:

get in class java.util.LinkedHashMap<K,V>

remove

public final V remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map<K,V>

Overrides:

remove in class java.util.HashMap<K,V>

clear

public final void clear()

Specified by:

clear in interface java.util.Map<K,V>

Overrides:

clear in class java.util.LinkedHashMap<K,V>

size

public final int size()

Specified by:

size in interface java.util.Map<K,V>

Overrides:

size in class java.util.HashMap<K,V>

isEmpty

public final boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<K,V>

Overrides:

isEmpty in class java.util.HashMap<K,V>

values

public final java.util.Collection<V> values()

Specified by:

values in interface java.util.Map<K,V>

Overrides:

values in class java.util.HashMap<K,V>

containsKey

public final boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map<K,V>

Overrides:

containsKey in class java.util.HashMap<K,V>

putAll

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

Specified by:

putAll in interface java.util.Map<K,V>

Overrides:

putAll in class java.util.HashMap<K,V>

containsValue

public final boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map<K,V>

Overrides:

containsValue in class java.util.LinkedHashMap<K,V>

entrySet

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

Specified by:

entrySet in interface java.util.Map<K,V>

Overrides:

entrySet in class java.util.HashMap<K,V>

keySet

public final java.util.Set<K> keySet()

Specified by:

keySet in interface java.util.Map<K,V>

Overrides:

keySet in class java.util.HashMap<K,V>

getCacheHits

public final long getCacheHits()

getCacheMisses

public final long getCacheMisses()

getMaxCacheSize

public final int getMaxCacheSize()

Specified by:

getMaxCacheSize in interface Cache<K,V>

setMaxCacheSize

public final void setMaxCacheSize(int maxCacheSize)

Specified by:

setMaxCacheSize in interface Cache<K,V>