| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_VR_SAMPLE_QUEUE_H_ |
| #define CHROME_BROWSER_VR_SAMPLE_QUEUE_H_ |
| |
| #include <vector> |
| |
| #include "base/macros.h" |
| |
| namespace vr { |
| |
| // Manages a fixed-size queue of samples including their current sum. Old |
| // samples are automatically dropped when an added sample would exceed the |
| // requested size. |
| class SampleQueue { |
| public: |
| explicit SampleQueue(size_t window_size); |
| ~SampleQueue(); |
| |
| int64_t GetSum() const { return sum_; } |
| |
| void AddSample(int64_t value); |
| |
| size_t GetCount() const { return samples_.size(); } |
| |
| // Get sliding window size for tests. |
| size_t GetWindowSize() const { return window_size_; } |
| |
| private: |
| int64_t sum_ = 0; |
| size_t current_index_ = 0; |
| size_t window_size_; |
| std::vector<int64_t> samples_; |
| DISALLOW_COPY_AND_ASSIGN(SampleQueue); |
| }; |
| |
| } // namespace vr |
| |
| #endif // CHROME_BROWSER_VR_SAMPLE_QUEUE_H_ |