remoting/test/leaky_bucket.cc

   1 // Copyright 2014 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/test/leaky_bucket.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace remoting {
  10
  11 LeakyBucket::LeakyBucket(double depth, double rate)
  12     : depth_(depth),
  13       rate_(rate),
  14       level_(0.0),
  15       last_update_(base::TimeTicks::Now()) {
  16 }
  17
  18 LeakyBucket::~LeakyBucket() {
  19 }
  20
  21 base::TimeDelta LeakyBucket::AddPacket(int size) {
  22   UpdateLevel();
  23
  24   double new_level = level_ + size;
  25   if (new_level > depth_)
  26     return base::TimeDelta::Max();
  27
  28   base::TimeDelta result = base::TimeDelta::FromSecondsD(level_ / rate_);
  29   level_ = new_level;
  30   return result;
  31 }
  32
  33 void LeakyBucket::UpdateLevel() {
  34   base::TimeTicks now = base::TimeTicks::Now();
  35   level_ -= rate_ * (now - last_update_).InSecondsF();
  36   if (level_ < 0.0)
  37     level_ = 0.0;
  38   last_update_ = now;
  39 }
  40
  41 }  // namespace remoting