org.datanucleus.store.fieldmanager
Class CacheRetrieveFieldManager

java.lang.Object
  org.datanucleus.store.fieldmanager.AbstractFieldManager
      org.datanucleus.store.fieldmanager.CacheRetrieveFieldManager

All Implemented Interfaces:

FieldConsumer, FieldManager, FieldSupplier

public class CacheRetrieveFieldManager
extends AbstractFieldManager

FieldManager to handle the retrieval of fields from a L2 cached object into a managed object. Will be called for all fields that are loaded in an L2 cached object. Any relation fields will be handled using the OIDs stored in "relationFields" in the CachedPC. These OIDs are taken and the ObjectManager.findObject() is called. This can result in getting that object from the Level2 cache also, or maybe from the Level1 if it is already present there.

Constructor Summary

CacheRetrieveFieldManager(ObjectProvider sm, ObjectProvider cacheSM, CachedPC cachedPC)
Constructor for a field manager for retrieval from the cache.

Method Summary

boolean	fetchBooleanField(int fieldNumber) Fetch a boolean field at the specified field number, returning it.
byte	fetchByteField(int fieldNumber) Fetch a byte field at the specified field number, returning it.
char	fetchCharField(int fieldNumber) Fetch a char field at the specified field number, returning it.
double	fetchDoubleField(int fieldNumber) Fetch a double field at the specified field number, returning it.
float	fetchFloatField(int fieldNumber) Fetch a float field at the specified field number, returning it.
int	fetchIntField(int fieldNumber) Fetch an int field at the specified field number, returning it.
long	fetchLongField(int fieldNumber) Fetch a long field at the specified field number, returning it.
java.lang.Object	fetchObjectField(int fieldNumber) Method to fetch an object field whether it is collection, map, PC, or whatever.
short	fetchShortField(int fieldNumber) Fetch a short field at the specified field number, returning it.
java.lang.String	fetchStringField(int fieldNumber) Fetch a string field at the specified field number, returning it.

Methods inherited from class org.datanucleus.store.fieldmanager.AbstractFieldManager

storeBooleanField, storeByteField, storeCharField, storeDoubleField, storeFloatField, storeIntField, storeLongField, storeObjectField, storeShortField, storeStringField

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheRetrieveFieldManager

public CacheRetrieveFieldManager(ObjectProvider sm,
                                 ObjectProvider cacheSM,
                                 CachedPC cachedPC)

Constructor for a field manager for retrieval from the cache.

Parameters:

sm - StateManager of the object being updated

cacheSM - StateManager of the L2 cached object (temporarily connected to allow access to field values)

cachedPC - The L2 cached object we are taking values from

Method Detail

fetchObjectField

public java.lang.Object fetchObjectField(int fieldNumber)

Method to fetch an object field whether it is collection, map, PC, or whatever.

Specified by:

fetchObjectField in interface FieldSupplier

Overrides:

fetchObjectField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The object stored in this field

fetchBooleanField

public boolean fetchBooleanField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a boolean field at the specified field number, returning it.

Specified by:

fetchBooleanField in interface FieldSupplier

Overrides:

fetchBooleanField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchByteField

public byte fetchByteField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a byte field at the specified field number, returning it.

Specified by:

fetchByteField in interface FieldSupplier

Overrides:

fetchByteField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchCharField

public char fetchCharField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a char field at the specified field number, returning it.

Specified by:

fetchCharField in interface FieldSupplier

Overrides:

fetchCharField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchDoubleField

public double fetchDoubleField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a double field at the specified field number, returning it.

Specified by:

fetchDoubleField in interface FieldSupplier

Overrides:

fetchDoubleField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchFloatField

public float fetchFloatField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a float field at the specified field number, returning it.

Specified by:

fetchFloatField in interface FieldSupplier

Overrides:

fetchFloatField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchIntField

public int fetchIntField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch an int field at the specified field number, returning it.

Specified by:

fetchIntField in interface FieldSupplier

Overrides:

fetchIntField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchLongField

public long fetchLongField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a long field at the specified field number, returning it.

Specified by:

fetchLongField in interface FieldSupplier

Overrides:

fetchLongField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchShortField

public short fetchShortField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a short field at the specified field number, returning it.

Specified by:

fetchShortField in interface FieldSupplier

Overrides:

fetchShortField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchStringField

public java.lang.String fetchStringField(int fieldNumber)

Description copied from interface: FieldSupplier

Fetch a string field at the specified field number, returning it.

Specified by:

fetchStringField in interface FieldSupplier

Overrides:

fetchStringField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value