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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \class storage::framework::Timer
* \ingroup clock
*
* \brief Class used to measure time differences.
*/
#pragma once
#include "clock.h"
namespace storage::framework {
class MilliSecTimer {
const Clock* _clock;
vespalib::steady_time _startTime;
public:
explicit MilliSecTimer(const Clock& clock)
: _clock(&clock), _startTime(_clock->getMonotonicTime()) {}
// Copy construction makes the most sense when creating a timer that is
// intended to inherit another timer's start time point, without incurring
// the cost of an initial clock sampling.
MilliSecTimer(const MilliSecTimer&) = default;
MilliSecTimer& operator=(const MilliSecTimer&) = default;
[[nodiscard]] vespalib::duration getElapsedTime() const {
return _clock->getMonotonicTime() - _startTime;
}
[[nodiscard]] double getElapsedTimeAsDouble() const {
using ToDuration = std::chrono::duration<double, std::milli>;
return std::chrono::duration_cast<ToDuration>(getElapsedTime()).count();
}
};
}
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