org.apache.giraph.writable.kryo

Class TransientRandom

java.lang.Object

org.apache.giraph.writable.kryo.TransientRandom

public class TransientRandom
extends Object

Transient Random class. Seed/state is not kept after serializing/deserializing. Within Blocks Framework - if we initialize Random within the Piece, when it's serialzied and copied to all workers and all threads - keeping seed would cause same series of random numbers to be generated everywhere. So this class is safe to be used in Pieces, while using regular Random class is forbidden to be serialized. Best approach would be to not have Random serialized, and create it on workers, where possible.

Constructor Summary

Constructors

Constructor and Description
TransientRandom()

Method Summary

Modifier and Type	Method and Description
Random	get() Get instance of Random
double	nextDouble() Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
int	nextInt(int n) Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Methods inherited from class java.lang.Object

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

Constructor Detail

TransientRandom

public TransientRandom()

Method Detail

get

public Random get()

Get instance of Random

Returns:

Random instance

nextInt

public int nextInt(int n)

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Parameters:

n - Given upper limit

Returns:

pseudorandom integer number in [0, n) range.

nextDouble

public double nextDouble()

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Returns:

pseudorandom number in [0, 1)