beedb/include/util/clock.h

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2022-04-04 20:25:01 +02:00
/*------------------------------------------------------------------------------*
* Architecture & Implementation of DBMS *
*------------------------------------------------------------------------------*
* Copyright 2022 Databases and Information Systems Group TU Dortmund *
* Visit us at *
* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
* OTHER DEALINGS IN THE SOFTWARE. *
* *
* Authors: *
* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
*------------------------------------------------------------------------------*
*/
#pragma once
#include <chrono>
#include <functional>
namespace beedb::util
{
/**
* Clock for time measurements while query execution.
* The clock is started directly on creation.
*/
class Clock
{
public:
Clock() : _start(std::chrono::steady_clock::now())
{
}
~Clock() = default;
/**
* Stops the measurement.
*
* @return Measured time in milliseconds.
*/
[[nodiscard]] std::chrono::milliseconds end() const
{
const auto end = std::chrono::steady_clock::now();
return std::chrono::duration_cast<std::chrono::milliseconds>(end - _start);
}
private:
std::chrono::time_point<std::chrono::steady_clock> _start;
};
} // namespace beedb::util