Package org.datanucleus.cache

Class WeakLevel2Cache

java.lang.Object

org.datanucleus.cache.AbstractReferencedLevel2Cache

org.datanucleus.cache.WeakLevel2Cache

All Implemented Interfaces:

Serializable, Level2Cache

public class WeakLevel2Cache
extends AbstractReferencedLevel2Cache

Weak referenced implementation of a Level 2 cache.

Operates with 3 maps internally. One stores all pinned objects that have been selected to be retained by user's application. The second stores all other objects, and is the default location where objects are placed when being added here, using weak references meaning that they can get garbage collected as necessary by the JVM. The third stores objects keyed by the unique key that they relate to.

Maintains collections of the classes and the identities that are to be pinned if they ever are put into the cache. These are defined by the pinAll(), pin() methods.

All mutating methods, and the get method have been synchronized to prevent conflicts.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static String	NAME

Fields inherited from class org.datanucleus.cache.AbstractReferencedLevel2Cache

apiAdapter, pinnedCache, pinnedClasses, pinnedIds, uniqueKeyCache, unpinnedCache

Constructor Summary

Constructors

Constructor	Description
WeakLevel2Cache(NucleusContext nucleusCtx)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected void	initialiseCaches()

Methods inherited from class org.datanucleus.cache.AbstractReferencedLevel2Cache

close, containsOid, evict, evictAll, evictAll, evictAll, evictAll, get, getAll, getNumberOfPinnedObjects, getNumberOfUnpinnedObjects, getSize, getUnique, isEmpty, pin, pinAll, pinAll, pinAll, put, putAll, putUnique, putUniqueAll, removeUnique, unpin, unpinAll, unpinAll, unpinAll

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

Constructor Detail

WeakLevel2Cache

public WeakLevel2Cache(NucleusContext nucleusCtx)

Constructor.

Parameters:

nucleusCtx - Context

Method Detail

initialiseCaches

protected void initialiseCaches()

Specified by:

initialiseCaches in class AbstractReferencedLevel2Cache