mirror of https://github.com/aria2/aria2
119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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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 <functional>
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#include "wallclock.h"
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namespace aria2 {
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namespace {
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constexpr auto WINDOW_TIME = 15_s;
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} // namespace
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SpeedCalc::SpeedCalc() : accumulatedLength_(0), bytesWindow_(0), maxSpeed_(0) {}
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void SpeedCalc::reset()
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{
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timeSlots_.clear();
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start_ = global::wallclock();
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accumulatedLength_ = 0;
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bytesWindow_ = 0;
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maxSpeed_ = 0;
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}
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void SpeedCalc::removeStaleTimeSlot(const Timer& now)
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{
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while (!timeSlots_.empty()) {
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if (timeSlots_[0].first.difference(now) <= WINDOW_TIME) {
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break;
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}
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bytesWindow_ -= timeSlots_[0].second;
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timeSlots_.pop_front();
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}
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}
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int SpeedCalc::calculateSpeed()
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{
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const auto& now = global::wallclock();
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removeStaleTimeSlot(now);
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if (timeSlots_.empty()) {
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return 0;
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}
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auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
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timeSlots_[0].first.difference(now)).count();
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if (elapsed <= 0) {
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elapsed = 1;
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}
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int speed = bytesWindow_ * 1000 / elapsed;
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maxSpeed_ = std::max(speed, maxSpeed_);
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return speed;
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}
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void SpeedCalc::update(size_t bytes)
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{
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const auto& now = global::wallclock();
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removeStaleTimeSlot(now);
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if (timeSlots_.empty() ||
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std::chrono::duration_cast<std::chrono::seconds>(
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timeSlots_.back().first.difference(now)) >= 1_s) {
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timeSlots_.push_back(std::make_pair(now, bytes));
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}
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else {
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timeSlots_.back().second += bytes;
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}
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bytesWindow_ += bytes;
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accumulatedLength_ += bytes;
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}
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int SpeedCalc::calculateAvgSpeed() const
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{
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auto milliElapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
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start_.difference(global::wallclock())).count();
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// if milliElapsed is too small, the average speed is rubbish, better
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// return 0
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if (milliElapsed > 4) {
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int speed = accumulatedLength_ * 1000 / milliElapsed;
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return speed;
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}
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else {
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return 0;
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}
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}
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} // namespace aria2
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