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org.eclipse.net4j.util.ref
Class ReferenceValueMap<K,V>

java.lang.Object
  extended by java.util.AbstractMap<K,V>
      extended by org.eclipse.net4j.util.ref.ReferenceValueMap<K,V>
All Implemented Interfaces:
ConcurrentMap<K,V>, Map<K,V>
Direct Known Subclasses:
ReferenceValueMap.Soft, ReferenceValueMap.Strong, ReferenceValueMap.Weak
public abstract class ReferenceValueMap<K,V>
extends AbstractMap<K,V>
implements ConcurrentMap<K,V>

A ConcurrentMap implementation that uses KeyedReference instances (KeyedStrongReference, KeyedSoftReference, KeyedWeakReference or KeyedPhantomReference) as its values.

A ReferenceValueMap can be used to cache mappings until the value of the mapping is no longer reachable from outside of the map

Note: This map is not synchronized. If it is to be used by multiple threads concurrently the user is responsible for applying proper external synchronization!

Nested Class Summary
static class ReferenceValueMap.Soft<K,V>
           
static class ReferenceValueMap.Strong<K,V>
           
static class ReferenceValueMap.Weak<K,V>
           
 
Nested classes/interfaces inherited from class java.util.AbstractMap
AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>
 
Nested classes/interfaces inherited from interface java.util.Map
Map.Entry<K,V>
 
Constructor Summary
ReferenceValueMap()
           
ReferenceValueMap(ConcurrentMap<K,KeyedReference<K,V>> map)
           
 
Method Summary
 void clear()
           
 boolean containsKey(Object key)
           
 boolean containsValue(Object value)
           
protected  ReferenceQueue<V> createQueue()
           
protected abstract  KeyedReference<K,V> createReference(K key, V value, ReferenceQueue<V> queue)
           
protected  V dereference(KeyedReference<K,V> ref)
           
 Set<Map.Entry<K,V>> entrySet()
           
 V get(Object key)
           
 boolean isEmpty()
           
protected  void purged(K key)
           
protected  void purgeQueue()
           
 V put(K key, V value)
           
 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()
           
 
Methods inherited from class java.util.AbstractMap
clone, equals, hashCode, keySet, putAll, toString, values
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.util.Map
equals, hashCode, keySet, putAll, values
 

Constructor Detail

ReferenceValueMap

public ReferenceValueMap()

ReferenceValueMap

public ReferenceValueMap(ConcurrentMap<K,KeyedReference<K,V>> map)
Method Detail

size

public int size()
Specified by:
size in interface Map<K,V>
Overrides:
size in class AbstractMap<K,V>

isEmpty

public boolean isEmpty()
Specified by:
isEmpty in interface Map<K,V>
Overrides:
isEmpty in class AbstractMap<K,V>

containsKey

public boolean containsKey(Object key)
Specified by:
containsKey in interface Map<K,V>
Overrides:
containsKey in class AbstractMap<K,V>

containsValue

public boolean containsValue(Object value)
Specified by:
containsValue in interface Map<K,V>
Overrides:
containsValue in class AbstractMap<K,V>

get

public V get(Object key)
Specified by:
get in interface Map<K,V>
Overrides:
get in class AbstractMap<K,V>

put

public V put(K key,
             V value)
Specified by:
put in interface Map<K,V>
Overrides:
put in class AbstractMap<K,V>

putIfAbsent

public V putIfAbsent(K key,
                     V value)
Specified by:
putIfAbsent in interface ConcurrentMap<K,V>

replace

public V replace(K key,
                 V value)
Specified by:
replace in interface ConcurrentMap<K,V>

replace

public boolean replace(K key,
                       V oldValue,
                       V newValue)
Specified by:
replace in interface ConcurrentMap<K,V>

remove

public V remove(Object key)
Specified by:
remove in interface Map<K,V>
Overrides:
remove in class AbstractMap<K,V>

remove

public boolean remove(Object key,
                      Object value)
Specified by:
remove in interface ConcurrentMap<K,V>

clear

public void clear()
Specified by:
clear in interface Map<K,V>
Overrides:
clear in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()
Specified by:
entrySet in interface Map<K,V>
Specified by:
entrySet in class AbstractMap<K,V>

createQueue

protected ReferenceQueue<V> createQueue()

purgeQueue

protected void purgeQueue()

purged

protected void purged(K key)

dereference

protected V dereference(KeyedReference<K,V> ref)

createReference

protected abstract KeyedReference<K,V> createReference(K key,
                                                       V value,
                                                       ReferenceQueue<V> queue)
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