mirror of https://github.com/aria2/aria2
83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - a simple utility for downloading files faster
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* copyright --> */
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#include "SpeedCalc.h"
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#include <algorithm>
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#include <ostream>
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#include <iterator>
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#define CHANGE_INTERVAL_SEC 15
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class Reset {
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public:
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void operator()(Time& tm) {
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tm.reset();
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}
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};
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void SpeedCalc::reset() {
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fill(&lengthArray[0], &lengthArray[2], 0);
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for_each(&cpArray[0], &cpArray[2], Reset());
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sw = 0;
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maxSpeed = 0;
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prevSpeed = 0;
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}
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int SpeedCalc::calculateSpeed() {
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int milliElapsed = cpArray[sw].differenceInMillis();
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if(milliElapsed) {
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int speed = lengthArray[sw]*1000/milliElapsed;
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prevSpeed = speed;
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maxSpeed = max<int>(speed, maxSpeed);
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return speed;
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} else {
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return prevSpeed;
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}
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}
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class Plus {
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private:
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int d;
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public:
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Plus(int d):d(d) {}
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void operator()(long long int& length) {
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length += d;
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}
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};
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void SpeedCalc::update(int bytes) {
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for_each(&lengthArray[0], &lengthArray[2], Plus(bytes));
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if(isIntervalOver()) {
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changeSw();
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}
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}
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bool SpeedCalc::isIntervalOver() const {
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return CHANGE_INTERVAL_SEC <= cpArray[sw].difference();
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}
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void SpeedCalc::changeSw() {
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lengthArray[sw] = 0;
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cpArray[sw].reset();
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sw ^= 0x01;
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}
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