Package com.db4o.internal

Class FrozenObjectInfo

java.lang.Object

com.db4o.internal.FrozenObjectInfo

All Implemented Interfaces:

ObjectInfo

public class FrozenObjectInfo
extends java.lang.Object
implements ObjectInfo

Constructor Summary

Constructors

Constructor	Description
FrozenObjectInfo(Transaction trans, ObjectReference ref, boolean committed)
FrozenObjectInfo(java.lang.Object object, long id, Db4oDatabase sourceDatabase, long uuidLongPart, long commitTimestamp)

Method Summary

Modifier and Type	Method	Description
long	getCommitTimestamp()	The serial timestamp the object is assigned to when it is committed. You need to enable this feature before using it in FileConfiguration.generateCommitTimestamps(boolean). All the objects commited within the same transaction will receive the same commitTimestamp. db4o replication system (dRS) relies on this feature.
long	getInternalID()	returns the internal db4o ID.
java.lang.Object	getObject()	returns the object that is referenced.
Db4oUUID	getUUID()	returns a UUID representation of the referenced object.
long	getVersion()	returns the transaction serial number ("version") the referenced object was stored with last.
long	sourceDatabaseId(Transaction trans)
long	uuidLongPart()

Methods inherited from class java.lang.Object

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

Constructor Detail

FrozenObjectInfo

public FrozenObjectInfo(java.lang.Object object,
                        long id,
                        Db4oDatabase sourceDatabase,
                        long uuidLongPart,
                        long commitTimestamp)

FrozenObjectInfo

public FrozenObjectInfo(Transaction trans,
                        ObjectReference ref,
                        boolean committed)

Method Detail

getInternalID

public long getInternalID()

Description copied from interface: ObjectInfo

returns the internal db4o ID.

Specified by:

getInternalID in interface ObjectInfo

getObject

public java.lang.Object getObject()

Description copied from interface: ObjectInfo

returns the object that is referenced.

This method may return null, if the object has been garbage collected.

Specified by:

getObject in interface ObjectInfo

Returns:

the referenced object or null, if the object has been garbage collected.

getUUID

public Db4oUUID getUUID()

Description copied from interface: ObjectInfo

returns a UUID representation of the referenced object. UUID generation has to be turned on, in order to be able to use this feature: FileConfiguration.generateUUIDs(com.db4o.config.ConfigScope)

Specified by:

getUUID in interface ObjectInfo

Returns:

the UUID of the referenced object.

getVersion

public long getVersion()

Description copied from interface: ObjectInfo

returns the transaction serial number ("version") the referenced object was stored with last. Version number generation has to be turned on, in order to be able to use this feature: FileConfiguration.generateVersionNumbers(com.db4o.config.ConfigScope)
This feature was replaced by ObjectInfo.getCommitTimestamp(). The main difference is that the old version mechanism used to assign a serial timestamp to the object upon storing time, and the new commitTimestamp approach, assigns it upon commit time.

Specified by:

getVersion in interface ObjectInfo

Returns:

the version number.

getCommitTimestamp

public long getCommitTimestamp()

Description copied from interface: ObjectInfo

The serial timestamp the object is assigned to when it is committed.

You need to enable this feature before using it in FileConfiguration.generateCommitTimestamps(boolean).

All the objects commited within the same transaction will receive the same commitTimestamp.

db4o replication system (dRS) relies on this feature.

Specified by:

getCommitTimestamp in interface ObjectInfo

Returns:

the serial timestamp that was given to the object upon commit.

See Also:

FileConfiguration.generateCommitTimestamps(boolean)

sourceDatabaseId

public long sourceDatabaseId(Transaction trans)

uuidLongPart

public long uuidLongPart()