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).
<p/>
NOTE : Can be a bottle neck due to the need to synchronize in order to increment an
internal count as part of the algorithm.
Constructor and Description |
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CustomVersionOneStrategy() |
Modifier and Type | Method and Description |
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static long |
generateLeastSignificantBits(long seed) |
UUID |
generateUUID(SharedSessionContractImplementor 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):<ul>
<li>1 = time based</li>
<li>2 = DCE based using POSIX UIDs</li>
<li>3 = name based (md5 hash)</li>
<li>4 = random numbers based</li>
<li>5 = name based (sha-1 hash)</li>
</ul>
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) |
public int getGeneratedVersion()
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):<ul> <li>1 = time based</li> <li>2 = DCE based using POSIX UIDs</li> <li>3 = name based (md5 hash)</li> <li>4 = random numbers based</li> <li>5 = name based (sha-1 hash)</li> </ul> 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. <p/> Informational only, and not used at this time.
getGeneratedVersion
in interface UUIDGenerationStrategy
public UUID generateUUID(SharedSessionContractImplementor session)
UUIDGenerationStrategy
Generate the UUID.
generateUUID
in interface UUIDGenerationStrategy
session
- The session asking for the generationpublic long getMostSignificantBits()
public static long generateLeastSignificantBits(long seed)
public static void main(String[] args)
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