1 // Copyright 2022 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 #pragma once 15 16 #include <chrono> 17 #include <cstdint> 18 #include <optional> 19 20 #include "pw_chrono/system_clock.h" 21 22 namespace pw::transfer { 23 24 class RateEstimate { 25 public: RateEstimate()26 constexpr RateEstimate() : start_time_(std::nullopt), bytes_transferred_(0) {} 27 Reset()28 void Reset() { 29 start_time_ = chrono::SystemClock::now(); 30 bytes_transferred_ = 0; 31 } 32 Update(size_t new_bytes)33 constexpr void Update(size_t new_bytes) { bytes_transferred_ += new_bytes; } 34 35 size_t GetRateBytesPerSecond() const; 36 37 private: 38 std::optional<chrono::SystemClock::time_point> start_time_; 39 size_t bytes_transferred_; 40 }; 41 42 } // namespace pw::transfer 43