remoting/base/running_average.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/base/running_average.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace remoting {
  10
  11 RunningAverage::RunningAverage(int window_size)
  12     : window_size_(window_size),
  13       sum_(0) {
  14   DCHECK_GT(window_size, 0);
  15 }
  16
  17 RunningAverage::~RunningAverage() {}
  18
  19 void RunningAverage::Record(int64_t value) {
  20   DCHECK(thread_checker_.CalledOnValidThread());
  21
  22   data_points_.push_back(value);
  23   sum_ += value;
  24
  25   if (data_points_.size() > window_size_) {
  26     sum_ -= data_points_[0];
  27     data_points_.pop_front();
  28   }
  29 }
  30
  31 double RunningAverage::Average() {
  32   DCHECK(thread_checker_.CalledOnValidThread());
  33
  34   if (data_points_.empty())
  35     return 0;
  36   return static_cast<double>(sum_) / data_points_.size();
  37 }
  38
  39 }  // namespace remoting