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// Copyright 2011 The Chromium Authors
// 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"
#include "base/check_op.h"
namespace remoting {
RateCounter::RateCounter(base::TimeDelta time_window)
: time_window_(time_window) {
DCHECK_GT(time_window, base::TimeDelta());
}
RateCounter::RateCounter(base::TimeDelta time_window,
const base::TickClock* tick_clock)
: time_window_(time_window), tick_clock_(tick_clock) {
DCHECK_GT(time_window, base::TimeDelta());
}
RateCounter::~RateCounter() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void RateCounter::Record(int64_t value) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::TimeTicks now = tick_clock_->NowTicks();
EvictOldDataPoints(now);
sum_ += value;
data_points_.push(std::make_pair(now, value));
}
double RateCounter::Rate() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// This is just to ensure the rate is up to date.
const_cast<RateCounter*>(this)->EvictOldDataPoints(tick_clock_->NowTicks());
return sum_ / time_window_.InSecondsF();
}
void RateCounter::EvictOldDataPoints(base::TimeTicks now) {
// Remove data points outside of the window.
base::TimeTicks window_start = now - 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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