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// 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.
#include "remoting/base/rate_counter.h"
namespace remoting {
RateCounter::RateCounter(base::TimeDelta time_window)
: time_window_(time_window),
sum_(0) {
}
RateCounter::~RateCounter() {
}
void RateCounter::Record(int64 value) {
base::Time current_time = base::Time::Now();
Evict(current_time);
base::AutoLock auto_lock(lock_);
sum_ += value;
data_points_.push(std::make_pair(current_time, value));
}
double RateCounter::Rate() {
Evict(base::Time::Now());
base::AutoLock auto_lock(lock_);
return static_cast<double>(base::Time::kMillisecondsPerSecond) * sum_ /
time_window_.InMilliseconds();
}
void RateCounter::Evict(base::Time current_time) {
base::AutoLock auto_lock(lock_);
// Remove data points outside of the window.
base::Time window_start = current_time - time_window_;
while (!data_points_.empty()) {
if (data_points_.front().first > window_start)
break;
sum_ -= data_points_.front().second;
data_points_.pop();
}
}
} // namespace remoting
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