org.apache.camel.util
Class LRUCache<K,V>

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.HashMap<K,V>
          java.util.LinkedHashMap<K,V>
              org.apache.camel.util.LRUCache<K,V>

All Implemented Interfaces:

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

Direct Known Subclasses:

LRUSoftCache

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

A Least Recently Used Cache

Version:

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

LRUCache(int maximumCacheSize)

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

V	get(Object o)
long	getHits() Gets the number of cache hits
int	getMaxCacheSize() Returns the maxCacheSize.
long	getMisses() Gets the number of cache misses.
protected boolean	removeEldestEntry(Map.Entry<K,V> entry)
void	resetStatistics() Rest the cache statistics such as hits and misses.
void	start() Starts the service
void	stop() Stops the service
String	toString()

Methods inherited from class java.util.LinkedHashMap

clear, containsValue

Methods inherited from class java.util.HashMap

clone, containsKey, entrySet, isEmpty, keySet, put, putAll, remove, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

containsKey, entrySet, equals, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Constructor Detail

LRUCache

public LRUCache(int maximumCacheSize)

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.

maximumCacheSize - the max 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 Detail

get

public V get(Object o)

Specified by:

get in interface Map<K,V>

Overrides:

get in class LinkedHashMap<K,V>

getHits

public long getHits()

Gets the number of cache hits

getMisses

public long getMisses()

Gets the number of cache misses.

getMaxCacheSize

public int getMaxCacheSize()

Returns the maxCacheSize.

resetStatistics

public void resetStatistics()

Rest the cache statistics such as hits and misses.

removeEldestEntry

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

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>

start

public void start()
           throws Exception

Description copied from interface: Service

Starts the service

Specified by:

start in interface Service

Throws:

Exception - is thrown if starting failed

stop

public void stop()
          throws Exception

Description copied from interface: Service

Stops the service

Specified by:

stop in interface Service

Throws:

Exception - is thrown if stopping failed

toString

public String toString()

Overrides:

toString in class AbstractMap<K,V>