org.dice_research.ldcbench.generate

Class SequentialSeedGenerator

java.lang.Object

org.dice_research.ldcbench.generate.SequentialSeedGenerator

All Implemented Interfaces:

LongSupplier, SeedGenerator

public class SequentialSeedGenerator
extends Object
implements SeedGenerator

A class that is able to generate a sequence of random seeds given a single seed.

Following the arguments in https://www.johndcook.com/blog/2016/01/29/random-number-generator-seed-mistakes/ this class is simply generating a sequence of numbers that are not independent of each other but make sure that the same numbers are not used too often.

Note that when using several instances of this class in parallel, the SequentialSeedGenerator(long, int, int) constructor should be used. It takes the id of the generator as well as the number of generators running in parallel. This makes sure that all these generators are creating different sequences of seeds.

Field Summary

Fields

Modifier and Type	Field and Description
private long	nextSeed The next seed which will be returned by this generator.
private long	stepSize The constant which is added to the last seed to create the new seed.

Constructor Summary

Constructors

Constructor and Description
SequentialSeedGenerator(long seed) Constructor if only a single instance is used.
SequentialSeedGenerator(long seed, int generatorId, int generatorCount) Constructor which should be used if multiple generators are used in parallel.

Method Summary

Modifier and Type	Method and Description
long	getNextSeed() Returns the next seed of this generator.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.dice_research.ldcbench.generate.SeedGenerator

getAsLong

Field Detail

nextSeed

private long nextSeed

The next seed which will be returned by this generator.

stepSize

private long stepSize

The constant which is added to the last seed to create the new seed.

Constructor Detail

SequentialSeedGenerator

public SequentialSeedGenerator(long seed)

Constructor if only a single instance is used.

Parameters:

seed - the original seed.

SequentialSeedGenerator

public SequentialSeedGenerator(long seed,
                               int generatorId,
                               int generatorCount)

Constructor which should be used if multiple generators are used in parallel.

Parameters:

seed - the single original seed

generatorId - id of this generator (< generatorCount)

generatorCount - number of generators used in parallel

Method Detail

getNextSeed

public long getNextSeed()

Description copied from interface: SeedGenerator

Returns the next seed of this generator.

Specified by:

getNextSeed in interface SeedGenerator

Returns:

the next seed generated