org.hibernate.id.uuid

Class CustomVersionOneStrategy

java.lang.Object

org.hibernate.id.uuid.CustomVersionOneStrategy

All Implemented Interfaces:

Serializable, UUIDGenerationStrategy

public class CustomVersionOneStrategy
extends Object
implements UUIDGenerationStrategy

Applies a version 1 (time-based) generation strategy (using ip address rather than mac address) but applies them in a different layout. The strategy is very similar to the legacy UUIDHexGenerator id generator but uses a RFC 4122 compliant layout (variant 2).

NOTE : Can be a bottle neck due to the need to synchronize in order to increment an internal count as part of the algorithm.

Author:

Steve Ebersole

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
CustomVersionOneStrategy()

Method Summary

Modifier and Type	Method and Description
static long	generateLeastSignificantBits(long seed)
UUID	generateUUID(SessionImplementor session) Generate the UUID.
int	getGeneratedVersion() Which variant, according to IETF RFC 4122, of UUID does this strategy generate? RFC 4122 defines 5 variants (though it only describes algorithms to generate 4): 1 = time based 2 = DCE based using POSIX UIDs 3 = name based (md5 hash) 4 = random numbers based 5 = name based (sha-1 hash) Returning the values above should be reserved to those generators creating variants compliant with the corresponding RFC definition; others can feel free to return other values as they see fit.
long	getMostSignificantBits()
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

CustomVersionOneStrategy

public CustomVersionOneStrategy()

Method Detail

getGeneratedVersion

public int getGeneratedVersion()

Description copied from interface: UUIDGenerationStrategy

Which variant, according to IETF RFC 4122, of UUID does this strategy generate? RFC 4122 defines 5 variants (though it only describes algorithms to generate 4):

• 1 = time based
• 2 = DCE based using POSIX UIDs
• 3 = name based (md5 hash)
• 4 = random numbers based
• 5 = name based (sha-1 hash)

Returning the values above should be reserved to those generators creating variants compliant with the corresponding RFC definition; others can feel free to return other values as they see fit.

Informational only, and not used at this time.

Specified by:

getGeneratedVersion in interface UUIDGenerationStrategy

Returns:

The supported generation version

generateUUID

public UUID generateUUID(SessionImplementor session)

Description copied from interface: UUIDGenerationStrategy

Generate the UUID.

Specified by:

generateUUID in interface UUIDGenerationStrategy

Parameters:

session - The session asking for the generation

Returns:

The generated UUID.

getMostSignificantBits

public long getMostSignificantBits()

generateLeastSignificantBits

public static long generateLeastSignificantBits(long seed)

main

public static void main(String[] args)