src/main/ratemeasurer.cpp

   1 /***************************************************************************
   2  *                                                                         *
   3  *   Copyright (C) 2006 David Brodsky                                      *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or         *
   6  *   modify it under the terms of the GNU General Public License as        *
   7  *   published by the Free Software Foundation and appearing               *
   8  *   in the file LICENSE.GPL included in the packaging of this file.       *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
  13  *   General Public License for more details.                              *
  14  *                                                                         *
  15  ***************************************************************************/
  16
  17 #include <tairon/net/timer.h>
  18
  19 #include "ratemeasurer.h"
  20
  21 namespace Tairent
  22 {
  23
  24 namespace Main
  25 {
  26
  27 /* {{{ RateMeasurer::RateMeasurer(double) */
  28 RateMeasurer::RateMeasurer(double p) : period(p)
  29 {
  30         lastTime = (double) Tairon::Net::Timer::currentTime() / 1000;
  31         startTime = lastTime - 1;
  32         rate = 0;
  33 }
  34 /* }}} */
  35
  36 /* {{{ RateMeasurer::~RateMeasurer() */
  37 RateMeasurer::~RateMeasurer()
  38 {
  39 }
  40 /* }}} */
  41
  42 /* {{{ RateMeasurer::getRate() */
  43 double RateMeasurer::getRate()
  44 {
  45         double t = (double) Tairon::Net::Timer::currentTime() / 1000;
  46         if (lastTime + (period / 2) < t)
  47                 update(0);
  48         return rate;
  49 }
  50 /* }}} */
  51
  52 /* {{{ RateMeasurer::update(unsigned int) */
  53 void RateMeasurer::update(unsigned int amount)
  54 {
  55         double t = (double) Tairon::Net::Timer::currentTime() / 1000;
  56         rate = ((rate * (lastTime - startTime)) + amount) / (t - startTime);
  57         lastTime = t;
  58         if (startTime < t - period)
  59                 startTime = t - period;
  60 }
  61 /* }}} */
  62
  63 }; // namespace Main
  64
  65 }; // namespace Tairent
  66
  67 // vim: ai sw=4 ts=4 noet fdm=marker