org.datanucleus.cache
Class NullLevel2Cache

java.lang.Object
  org.datanucleus.cache.NullLevel2Cache

All Implemented Interfaces:

Level2Cache

public class NullLevel2Cache
extends java.lang.Object
implements Level2Cache

Null implementation of a Level 2 Cache. Does nothing when its methods are invoked.

Nested Class Summary

Nested classes/interfaces inherited from interface org.datanucleus.cache.Level2Cache

Level2Cache.PinnedClass

Constructor Summary

NullLevel2Cache()

Method Summary

void	clear() Method to clear the cache.
void	close() Method to close the cache when no longer needed.
boolean	containsOid(java.lang.Object oid) Accessor for whether an object with the specified id is in the cache
void	evict(java.lang.Object oid) Evict the parameter instance from the second-level cache.
void	evictAll() Evict the parameter instances from the second-level cache.
void	evictAll(java.lang.Class pcClass, boolean subclasses) Evict the parameter instances from the second-level cache.
void	evictAll(java.util.Collection oids) Evict the parameter instances from the second-level cache.
void	evictAll(java.lang.Object[] oids) Evict the parameter instances from the second-level cache.
CachedPC	get(java.lang.Object oid) Accessor for an object from the cache
int	getNumberOfPinnedObjects() Accessor for the number of pinned objects in the cache.
int	getNumberOfUnpinnedObjects() Accessor for the number of unpinned objects in the cache.
int	getSize() Accessor for the total number of objects in the L2 cache.
boolean	isEmpty() Accessor for whether the cache is empty.
void	pin(java.lang.Object oid) Pin the parameter instance in the second-level cache.
void	pinAll(java.lang.Class pcClass, boolean subclasses) Evict the parameter instances from the second-level cache.
void	pinAll(java.util.Collection oids) Pin the parameter instances in the second-level cache.
void	pinAll(java.lang.Object[] oids) Pin the parameter instances in the second-level cache.
CachedPC	put(java.lang.Object oid, CachedPC pc) Method to put an object in the L2 cache
void	unpin(java.lang.Object oid) Unpin the parameter instance from the second-level cache.
void	unpinAll(java.lang.Class pcClass, boolean subclasses) Unpin instances from the second-level cache.
void	unpinAll(java.util.Collection oids) Unpin the parameter instances from the second-level cache.
void	unpinAll(java.lang.Object[] oids) Unpin the parameter instances from the second-level cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullLevel2Cache

public NullLevel2Cache()

Method Detail

close

public void close()

Method to close the cache when no longer needed. Provides a hook to release resources etc.

Specified by:

close in interface Level2Cache

evict

public void evict(java.lang.Object oid)

Evict the parameter instance from the second-level cache.

Specified by:

evict in interface Level2Cache

Parameters:

oid - the object id of the instance to evict.

evictAll

public void evictAll()

Evict the parameter instances from the second-level cache. All instances in the PersistenceManager's cache are evicted from the second-level cache.

Specified by:

evictAll in interface Level2Cache

evictAll

public void evictAll(java.lang.Class pcClass,
                     boolean subclasses)

Evict the parameter instances from the second-level cache.

Specified by:

evictAll in interface Level2Cache

Parameters:

pcClass - the class to evict

subclasses - Whether to evict all subclasses of this class also

evictAll

public void evictAll(java.util.Collection oids)

Evict the parameter instances from the second-level cache.

Specified by:

evictAll in interface Level2Cache

Parameters:

oids - the object ids of the instance to evict.

evictAll

public void evictAll(java.lang.Object[] oids)

Evict the parameter instances from the second-level cache.

Specified by:

evictAll in interface Level2Cache

Parameters:

oids - the object ids of the instances to evict

pin

public void pin(java.lang.Object oid)

Pin the parameter instance in the second-level cache.

Specified by:

pin in interface Level2Cache

Parameters:

oid - the object id of the instance to pin.

pinAll

public void pinAll(java.lang.Class pcClass,
                   boolean subclasses)

Evict the parameter instances from the second-level cache.

Specified by:

pinAll in interface Level2Cache

Parameters:

pcClass - the class of instances to evict

subclasses - if true, evict instances of subclasses also

pinAll

public void pinAll(java.util.Collection oids)

Pin the parameter instances in the second-level cache.

Specified by:

pinAll in interface Level2Cache

Parameters:

oids - the object ids of the instances to pin.

pinAll

public void pinAll(java.lang.Object[] oids)

Pin the parameter instances in the second-level cache.

Specified by:

pinAll in interface Level2Cache

Parameters:

oids - the object ids of the instances to pin.

unpin

public void unpin(java.lang.Object oid)

Unpin the parameter instance from the second-level cache.

Specified by:

unpin in interface Level2Cache

Parameters:

oid - the object id of the instance to unpin.

unpinAll

public void unpinAll(java.lang.Class pcClass,
                     boolean subclasses)

Unpin instances from the second-level cache.

Specified by:

unpinAll in interface Level2Cache

Parameters:

pcClass - the class of instances to unpin

subclasses - if true, unpin instances of subclasses also

unpinAll

public void unpinAll(java.util.Collection oids)

Unpin the parameter instances from the second-level cache.

Specified by:

unpinAll in interface Level2Cache

Parameters:

oids - the object ids of the instance to evict.

unpinAll

public void unpinAll(java.lang.Object[] oids)

Unpin the parameter instances from the second-level cache.

Specified by:

unpinAll in interface Level2Cache

Parameters:

oids - the object ids of the instance to evict.

clear

public void clear()

Method to clear the cache.

Specified by:

clear in interface Level2Cache

containsOid

public boolean containsOid(java.lang.Object oid)

Accessor for whether an object with the specified id is in the cache

Specified by:

containsOid in interface Level2Cache

Parameters:

oid - The object id

Returns:

Whether it is in the cache

get

public CachedPC get(java.lang.Object oid)

Accessor for an object from the cache

Specified by:

get in interface Level2Cache

Parameters:

oid - The identity

Returns:

The cacheable object

getNumberOfPinnedObjects

public int getNumberOfPinnedObjects()

Description copied from interface: Level2Cache

Accessor for the number of pinned objects in the cache.

Specified by:

getNumberOfPinnedObjects in interface Level2Cache

Returns:

Number of pinned objects

See Also:

Level2Cache.getNumberOfPinnedObjects()

getNumberOfUnpinnedObjects

public int getNumberOfUnpinnedObjects()

Description copied from interface: Level2Cache

Accessor for the number of unpinned objects in the cache.

Specified by:

getNumberOfUnpinnedObjects in interface Level2Cache

Returns:

Number of unpinned objects

See Also:

Level2Cache.getNumberOfUnpinnedObjects()

getSize

public int getSize()

Description copied from interface: Level2Cache

Accessor for the total number of objects in the L2 cache.

Specified by:

getSize in interface Level2Cache

Returns:

Number of objects

See Also:

Level2Cache.getSize()

isEmpty

public boolean isEmpty()

Description copied from interface: Level2Cache

Accessor for whether the cache is empty.

Specified by:

isEmpty in interface Level2Cache

Returns:

Whether it is empty.

See Also:

Level2Cache.isEmpty()

put

public CachedPC put(java.lang.Object oid,
                    CachedPC pc)

Method to put an object in the L2 cache

Specified by:

put in interface Level2Cache

Parameters:

oid - The identity

pc - Cacheable form of the PC

Returns:

Previous value stored for this id