mirror of https://github.com/aria2/aria2
118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
/* <!-- copyright */
|
|
/*
|
|
* aria2 - The high speed download utility
|
|
*
|
|
* Copyright (C) 2006 Tatsuhiro Tsujikawa
|
|
*
|
|
* This program 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* In addition, as a special exception, the copyright holders give
|
|
* permission to link the code of portions of this program with the
|
|
* OpenSSL library under certain conditions as described in each
|
|
* individual source file, and distribute linked combinations
|
|
* including the two.
|
|
* You must obey the GNU General Public License in all respects
|
|
* for all of the code used other than OpenSSL. If you modify
|
|
* file(s) with this exception, you may extend this exception to your
|
|
* version of the file(s), but you are not obligated to do so. If you
|
|
* do not wish to do so, delete this exception statement from your
|
|
* version. If you delete this exception statement from all source
|
|
* files in the program, then also delete it here.
|
|
*/
|
|
/* copyright --> */
|
|
#include "SpeedCalc.h"
|
|
|
|
#include <algorithm>
|
|
#include <functional>
|
|
|
|
#include "wallclock.h"
|
|
|
|
namespace aria2 {
|
|
|
|
#define CHANGE_INTERVAL_SEC 15
|
|
|
|
SpeedCalc::SpeedCalc():sw_(0), maxSpeed_(0), prevSpeed_(0),
|
|
accumulatedLength_(0),
|
|
nextInterval_(CHANGE_INTERVAL_SEC)
|
|
{
|
|
std::fill(&lengthArray_[0], &lengthArray_[2], 0);
|
|
}
|
|
|
|
void SpeedCalc::reset() {
|
|
std::fill(&lengthArray_[0], &lengthArray_[2], 0);
|
|
std::fill(&cpArray_[0], &cpArray_[2], global::wallclock);
|
|
sw_ = 0;
|
|
maxSpeed_ = 0;
|
|
prevSpeed_ = 0;
|
|
start_ = global::wallclock;
|
|
accumulatedLength_ = 0;
|
|
nextInterval_ = CHANGE_INTERVAL_SEC;
|
|
}
|
|
|
|
unsigned int SpeedCalc::calculateSpeed() {
|
|
int64_t milliElapsed = cpArray_[sw_].differenceInMillis(global::wallclock);
|
|
if(milliElapsed) {
|
|
unsigned int speed = lengthArray_[sw_]*1000/milliElapsed;
|
|
prevSpeed_ = speed;
|
|
maxSpeed_ = std::max(speed, maxSpeed_);
|
|
if(isIntervalOver(milliElapsed)) {
|
|
changeSw();
|
|
}
|
|
return speed;
|
|
} else {
|
|
return prevSpeed_;
|
|
}
|
|
}
|
|
|
|
void SpeedCalc::update(size_t bytes) {
|
|
accumulatedLength_ += bytes;
|
|
std::transform(&lengthArray_[0], &lengthArray_[2], &lengthArray_[0],
|
|
std::bind1st(std::plus<uint64_t>(), (uint64_t)bytes));
|
|
if(isIntervalOver()) {
|
|
changeSw();
|
|
}
|
|
}
|
|
|
|
bool SpeedCalc::isIntervalOver() const {
|
|
return nextInterval_ <= cpArray_[sw_].difference(global::wallclock);
|
|
}
|
|
|
|
bool SpeedCalc::isIntervalOver(int64_t milliElapsed) const
|
|
{
|
|
return nextInterval_ <= milliElapsed/1000;
|
|
}
|
|
|
|
void SpeedCalc::changeSw() {
|
|
lengthArray_[sw_] = 0;
|
|
cpArray_[sw_] = global::wallclock;
|
|
sw_ ^= 0x01u;
|
|
nextInterval_ =
|
|
cpArray_[sw_].difference(global::wallclock)+CHANGE_INTERVAL_SEC;
|
|
}
|
|
|
|
unsigned int SpeedCalc::calculateAvgSpeed() const {
|
|
uint64_t milliElapsed = start_.differenceInMillis(global::wallclock);
|
|
|
|
// if milliElapsed is too small, the average speed is rubish, better return 0
|
|
if(milliElapsed > 4) {
|
|
unsigned int speed = accumulatedLength_*1000/milliElapsed;
|
|
return speed;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
} // namespace aria2
|