Show max latency on client's status bar

remoting/base/running_average.h

-// Copyright (c) 2011 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 REMOTING_BASE_RUNNING_AVERAGE_H_
-#define REMOTING_BASE_RUNNING_AVERAGE_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <deque>
-
-#include "base/macros.h"
-#include "base/threading/thread_checker.h"
-
-namespace remoting {
-
-// Calculates the average of the most recent N recorded samples.
-// This is typically used to smooth out random variation in point samples
-// over bandwidth, frame rate, etc.
-class RunningAverage {
- public:
-  // Constructs a helper to average over the |window_size| most recent samples.
-  explicit RunningAverage(int window_size);
-  virtual ~RunningAverage();
-
-  // Records a point sample.
-  void Record(int64_t value);
-
-  // Returns the average over up to |window_size| of the most recent samples.
-  double Average();
-
- private:
-  // Stores the desired window size, as size_t to avoid casting when comparing
-  // with the size of |data_points_|.
-  const size_t window_size_;
-
-  // Stores the |window_size| most recently recorded samples.
-  std::deque<int64_t> data_points_;
-
-  // Holds the sum of the samples in |data_points_|.
-  int64_t sum_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(RunningAverage);
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_BASE_RUNNING_AVERAGE_H_