Package io.nosqlbench.virtdata.library.basics.core.stathelpers

Class AliasSamplerDoubleInt

java.lang.Object
io.nosqlbench.virtdata.library.basics.core.stathelpers.AliasSamplerDoubleInt
All Implemented Interfaces:
java.util.function.DoubleToIntFunction
public class AliasSamplerDoubleInt
extends java.lang.Object
implements java.util.function.DoubleToIntFunction
Uses the alias sampling method to encode and sample from discrete probabilities, even over larger sets of data. This form requires a unit interval sample value between 0.0 and 1.0. Assuming the maximal amount of memory is used for distinct outcomes N, a memory buffer of N*16 bytes is required for this implementation, requiring 32MB of memory for 1M entries. This sampler should be shared between threads, and will be by default, in order to avoid many instances of a 32MB buffer on heap.

  • Field Summary

    Fields 
    Modifier and Type Field Description
    static int RECORD_LEN  

  • Constructor Summary

    Constructors 
    Constructor Description
    AliasSamplerDoubleInt​(java.util.List<EvProbD> events)  

  • Method Summary

    Modifier and Type Method Description
    int applyAsInt​(double value)  

    Methods inherited from class java.lang.Object

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

  • Field Details

  • Constructor Details

  • Method Details

    • applyAsInt

      public int applyAsInt​(double value)
      Specified by:
      applyAsInt in interface java.util.function.DoubleToIntFunction