org.apache.hadoop.hbase.util

Class Random64

java.lang.Object

org.apache.hadoop.hbase.util.Random64

@InterfaceAudience.Private
public class Random64
extends Object

An instance of this class is used to generate a stream of pseudorandom numbers. The class uses a 64-bit seed, which is modified using a linear congruential formula. see https://en.wikipedia.org/wiki/Linear_congruential_generator

Constructor Summary

Constructors

Constructor and Description
Random64()
Random64(long seed)

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args) Random64 is a pseudorandom algorithm(LCG).
void	nextBytes(byte[] bytes)
long	nextLong()

Methods inherited from class java.lang.Object

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

Constructor Detail

Random64

public Random64()

Random64

public Random64(long seed)

Method Detail

nextLong

public long nextLong()

nextBytes

public void nextBytes(byte[] bytes)

main

public static void main(String[] args)

Random64 is a pseudorandom algorithm(LCG). Therefore, we will get same sequence if seeds are the same. This main will test how many calls nextLong() it will get the same seed. We do not need to save all numbers (that is too large). We could save once every 100000 calls nextLong(). If it get a same seed, we can detect this by calling nextLong() 100000 times continuously.