/*
* Copyright 2010-2015 Institut Pasteur.
*
* This file is part of Icy.
*
* Icy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Icy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Icy. If not, see <http://www.gnu.org/licenses/>.
*/
package icy.math;
/**
* Uses this class to maintain and calculate a rate.
*
* @author stephane
*/
public class RateMeter
{
private double lastCnt;
private double rate;
private double rateCnt;
private double lastRateCnt;
public RateMeter()
{
super();
reset();
}
/**
* Reset counter
*/
public void reset()
{
lastCnt = System.nanoTime();
rate = 0;
rateCnt = 0;
lastRateCnt = 0;
}
/**
* Update rate from delta<br>
* Return current rate
*/
public double updateFromDelta(double delta)
{
return updateFromTotal(rateCnt + delta);
}
/**
* Update rate from total<br>
* Return current rate
*/
public double updateFromTotal(double total)
{
final double curCnt = System.nanoTime();
final double difCnt = curCnt - lastCnt;
rateCnt = total;
if (difCnt > 1000000000d)
{
lastCnt = curCnt;
rate = rateCnt - lastRateCnt;
rate *= 1000000000d;
rate /= difCnt;
lastRateCnt = rateCnt;
}
return rate;
}
/**
* @return rate
*/
public double getRate()
{
return rate;
}
}