CustomVersionOneStrategy (Hibernate JavaDocs)
Date: 2012-04-05

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## 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.

See Also:
  Serialized Form

Constructor Summary
`CustomVersionOneStrategy()`

Method Summary
`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)

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