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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @class MetricTimer
* @ingruop metrics
*
* @brief Used to add time values to metrics.
*/
#pragma once
#include "valuemetric.h"
#include <chrono>
namespace metrics {
class MetricTimer {
public:
MetricTimer();
/**
* Adds ms passed since this timer was constructed to given value metric.
* Returns that value as well.
*
* Uses a steady (monotonic) clock internally so value should never
* underflow or be affected by system clock changes.
*/
template<typename AvgVal, typename TotVal, bool SumOnAdd>
AvgVal stop(ValueMetric<AvgVal, TotVal, SumOnAdd>& metric) const {
const auto delta = std::chrono::steady_clock::now() - _startTime;
using ToDuration = std::chrono::duration<AvgVal, std::milli>;
const auto deltaMs(std::chrono::duration_cast<ToDuration>(delta).count());
metric.addValue(deltaMs);
return deltaMs;
}
private:
std::chrono::steady_clock::time_point _startTime;
};
} // metrics
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