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

All Implemented Interfaces:

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

Direct Known Subclasses:

EndpointRegistry

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

A Least Recently Used Cache which uses SoftReference.

This implementation uses SoftReference for stored values in the cache, to support the JVM when it wants to reclaim objects when its running out of memory. Therefore this implementation does not support all the Map methods.

The following methods is only be be used:

• containsKey - To determine if the key is in the cache and refers to a value
• entrySet - To return a set of all the entries (as key/value paris)
• get - To get a value from the cache
• isEmpty - To determine if the cache contains any values
• keySet - To return a set of the current keys which refers to a value
• put - To add a value to the cache
• putAll - To add values to the cache
• remove - To remove a value from the cache by its key
• size - To get the current size
• values - To return a copy of all the value in a list

The LinkedHashMap.containsValue(Object) method should not be used as it's not adjusted to check for the existence of a value without catering for the soft references.

See Also:

LRUCache, Serialized Form

Nested Class Summary

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

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

Constructor Summary

LRUSoftCache(int maximumCacheSize)

LRUSoftCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder)

Method Summary

boolean	containsKey(Object o)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object o)
boolean	isEmpty()
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> map)
V	remove(Object o)
int	size()
String	toString()
Collection<V>	values()

Methods inherited from class org.apache.camel.util.LRUCache

getHits, getMaxCacheSize, getMisses, removeEldestEntry, resetStatistics, start, stop

Methods inherited from class java.util.LinkedHashMap

clear, containsValue

Methods inherited from class java.util.HashMap

clone

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

equals, hashCode

Constructor Detail

LRUSoftCache

public LRUSoftCache(int maximumCacheSize)

LRUSoftCache

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

Method Detail

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class HashMap<K,V>

get

public V get(Object o)

Specified by:

get in interface Map<K,V>

Overrides:

get in class LRUCache<K,V>

putAll

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

Specified by:

putAll in interface Map<K,V>

Overrides:

putAll in class HashMap<K,V>

remove

public V remove(Object o)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class HashMap<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Overrides:

values in class HashMap<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class HashMap<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

Overrides:

isEmpty in class HashMap<K,V>

containsKey

public boolean containsKey(Object o)

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class HashMap<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

Overrides:

keySet in class HashMap<K,V>

entrySet

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

Specified by:

entrySet in interface Map<K,V>

Overrides:

entrySet in class HashMap<K,V>

toString

public String toString()

Overrides:

toString in class LRUCache<K,V>