SSF.App.Worm
Class CR2SuscFracDistr

java.lang.Object
  |
  +--SSF.App.Worm.CR2SuscFracDistr

public class CR2SuscFracDistr

extends java.lang.Object

Distribution of fraction of an ASs announced IP space populated by hosts that were susceptible to the Code Red II worm in Sept 2001. Empirical distribution based on data from CAIDA site [David Moore].

See main() method for usage example.

Nested Class Summary

static class

CR2SuscFracDistr.TestFixture Unit test code.

Constructor Summary

CR2SuscFracDistr(boolean useTheor)
Test code.

Method Summary

static void	discard() Deallocate the lookup table to let the memory be reclaimed.
static void	init(boolean useTheoreticalDistr, RandomStream _rng) Initialize the lookup table.
static void	main(java.lang.String[] argv) Simple test code.
static double	nextDouble() Draw a sample from the Susceptible fraction distribution.

Methods inherited from class java.lang.Object

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

Constructor Detail

CR2SuscFracDistr

public CR2SuscFracDistr(boolean useTheor)

Test code. For normal usage, do not instantiate. Singleton class.

Method Detail

init

public static void init(boolean useTheoreticalDistr,
                        RandomStream _rng)

Initialize the lookup table. Must be called before any samples can be drawn.

Parameters:

useTheoreticalDistr - Set to true to use the approximate theoretical distribution instead of the empirical distr.

_rng - A random number stream. As defined in the SSF.Util.Random package.

nextDouble

public static double nextDouble()

Draw a sample from the Susceptible fraction distribution.

discard

public static void discard()

Deallocate the lookup table to let the memory be reclaimed. No more samples can be drawn from the distribution.

main

public static void main(java.lang.String[] argv)

Simple test code.