org.datanucleus.cache

Class SoftRefCache

java.lang.Object

org.datanucleus.cache.SoftRefCache

All Implemented Interfaces:

Map<Object,ObjectProvider>, Level1Cache

public class SoftRefCache
extends 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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
SoftRefCache()

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set	entrySet()
ObjectProvider	get(Object key)
boolean	isEmpty()
Set	keySet()
ObjectProvider	put(Object key, ObjectProvider value)
void	putAll(Map t)
ObjectProvider	remove(Object key)
int	size()
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()

Method Detail

put

public ObjectProvider put(Object key,
                 ObjectProvider value)

Specified by:

put in interface Map<Object,ObjectProvider>

get

public ObjectProvider get(Object key)

Specified by:

get in interface Map<Object,ObjectProvider>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<Object,ObjectProvider>

remove

public ObjectProvider remove(Object key)

Specified by:

remove in interface Map<Object,ObjectProvider>

clear

public void clear()

Specified by:

clear in interface Map<Object,ObjectProvider>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<Object,ObjectProvider>

entrySet

public Set entrySet()

Specified by:

entrySet in interface Map<Object,ObjectProvider>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Object,ObjectProvider>

keySet

public Set keySet()

Specified by:

keySet in interface Map<Object,ObjectProvider>

putAll

public void putAll(Map t)

Specified by:

putAll in interface Map<Object,ObjectProvider>

size

public int size()

Specified by:

size in interface Map<Object,ObjectProvider>

values

public Collection values()

Specified by:

values in interface Map<Object,ObjectProvider>