/*
* Title: CloudSim Toolkit
* Description: CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2009-2012, The University of Melbourne, Australia
*/
package org.cloudbus.cloudsim.distributions;
import org.apache.commons.math3.distribution.ExponentialDistribution;
/**
* A pseudo random number generator following the
* <a href="https://en.wikipedia.org/wiki/Exponential_distribution">Exponential distribution</a>.
*
* @author Marcos Dias de Assuncao
* @since CloudSim Toolkit 1.0
*/
public class ExponentialDistr implements ContinuousDistribution {
/** The internal exponential number generator. */
private final ExponentialDistribution numGen;
/**
* Creates a new exponential pseudo random number generator.
*
* @param seed the seed to be used.
* @param mean the mean for the distribution.
*/
public ExponentialDistr(long seed, double mean) {
this(mean);
numGen.reseedRandomGenerator(seed);
}
/**
* Creates a new exponential pseudo random number generator.
*
* @param mean the mean for the distribution.
*/
public ExponentialDistr(double mean) {
numGen = new ExponentialDistribution(mean);
}
@Override
public double sample() {
return numGen.sample();
}
}