Package io.nosqlbench.virtdata.library.basics.shared.from_long.to_uuid

Class ToUUID

java.lang.Object
io.nosqlbench.virtdata.library.basics.shared.from_long.to_uuid.ToUUID
All Implemented Interfaces:
java.util.function.LongFunction<java.util.UUID>
public class ToUUID
extends java.lang.Object
implements java.util.function.LongFunction<java.util.UUID>
This function creates a non-random UUID in the type 4 version (Random). It always puts the same value in the MSB position of the UUID format. The input value is put in the LSB position. 
 xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
 mmmmmmmm-mmmm-Mmmm-Llll-llllllllllll
               4    3
As shown above, the LSB position does not have the complication of having a version identifier (position M) dividing the dynamic range of the data type. For this reason, only the LSB side is used for this mapper, which allows an effective range of Long.MAX_VALUE/8, given the loss of 3 digits of precision. This function is suitable for deterministic testing of scenarios which depend on type 4 UUIDs, but without the mandated randomness that makes testing difficult. Just be aware that the MSB will always contain value 0x0123456789ABCDEFL unless you specify a different long value to pre-fill it with.

  • Constructor Summary

    Constructors 
    Constructor Description
    ToUUID()  
    ToUUID​(long msbs)  

  • Method Summary

    Modifier and Type Method Description
    java.util.UUID apply​(long value)  

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • ToUUID

      public ToUUID()

    • ToUUID

      public ToUUID​(long msbs)

  • Method Details

    • apply

      public java.util.UUID apply​(long value)
      Specified by:
      apply in interface java.util.function.LongFunction<java.util.UUID>