org.datanucleus.cache
Class SoftRefCache

java.lang.Object
  extended by org.datanucleus.cache.SoftRefCache
All Implemented Interfaces:
java.util.Map, Level1Cache

public class SoftRefCache
extends java.lang.Object
implements Level1Cache

Level 1 Cache using Soft referenced objects in a Map.

If map entry value object is not actively being used, i.e. no other object has a strong reference to it, it may become garbage collected at the discretion of the garbage collector (typically if the VM is low on memory). If this happens, the entry in the SoftValueMap corresponding to the value object will also be removed.

See Also:
SoftReference

Nested Class Summary
 
Nested classes/interfaces inherited from interface java.util.Map
java.util.Map.Entry<K,V>
 
Constructor Summary
SoftRefCache()
          Default constructor (required)
 
Method Summary
 void clear()
           
 boolean containsKey(java.lang.Object key)
           
 boolean containsValue(java.lang.Object value)
           
 java.util.Set entrySet()
           
 java.lang.Object get(java.lang.Object key)
           
 boolean isEmpty()
           
 java.util.Set keySet()
           
 java.lang.Object put(java.lang.Object key, java.lang.Object value)
           
 void putAll(java.util.Map t)
           
 java.lang.Object remove(java.lang.Object key)
           
 int size()
           
 java.util.Collection values()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.util.Map
equals, hashCode
 

Constructor Detail

SoftRefCache

public SoftRefCache()
Default constructor (required)

Method Detail

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)
Specified by:
put in interface java.util.Map

get

public java.lang.Object get(java.lang.Object key)
Specified by:
get in interface java.util.Map

containsKey

public boolean containsKey(java.lang.Object key)
Specified by:
containsKey in interface java.util.Map

remove

public java.lang.Object remove(java.lang.Object key)
Specified by:
remove in interface java.util.Map

clear

public void clear()
Specified by:
clear in interface java.util.Map

containsValue

public boolean containsValue(java.lang.Object value)
Specified by:
containsValue in interface java.util.Map

entrySet

public java.util.Set entrySet()
Specified by:
entrySet in interface java.util.Map

isEmpty

public boolean isEmpty()
Specified by:
isEmpty in interface java.util.Map

keySet

public java.util.Set keySet()
Specified by:
keySet in interface java.util.Map

putAll

public void putAll(java.util.Map t)
Specified by:
putAll in interface java.util.Map

size

public int size()
Specified by:
size in interface java.util.Map

values

public java.util.Collection values()
Specified by:
values in interface java.util.Map


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