1 /* <!-- copyright */ 2 /* 3 * aria2 - The high speed download utility 4 * 5 * Copyright (C) 2006 Tatsuhiro Tsujikawa 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 * 21 * In addition, as a special exception, the copyright holders give 22 * permission to link the code of portions of this program with the 23 * OpenSSL library under certain conditions as described in each 24 * individual source file, and distribute linked combinations 25 * including the two. 26 * You must obey the GNU General Public License in all respects 27 * for all of the code used other than OpenSSL. If you modify 28 * file(s) with this exception, you may extend this exception to your 29 * version of the file(s), but you are not obligated to do so. If you 30 * do not wish to do so, delete this exception statement from your 31 * version. If you delete this exception statement from all source 32 * files in the program, then also delete it here. 33 */ 34 /* copyright --> */ 35 #ifndef D_SPEED_CALC_H 36 #define D_SPEED_CALC_H 37 38 #include "common.h" 39 40 #include <deque> 41 42 #include "TimerA2.h" 43 44 namespace aria2 { 45 46 class SpeedCalc { 47 private: 48 std::deque<std::pair<Timer, size_t>> timeSlots_; 49 Timer start_; 50 int64_t accumulatedLength_; 51 int64_t bytesWindow_; 52 int maxSpeed_; 53 54 void removeStaleTimeSlot(const Timer& now); 55 56 public: 57 SpeedCalc(); 58 59 /** 60 * Returns download/upload speed in byte per sec 61 */ 62 int calculateSpeed(); 63 64 int calculateNewestSpeed(int seconds); 65 getMaxSpeed()66 int getMaxSpeed() const { return maxSpeed_; } 67 68 int calculateAvgSpeed() const; 69 70 void update(size_t bytes); 71 72 void reset(); 73 }; 74 75 } // namespace aria2 76 77 #endif // D_SPEED_CALC_H 78