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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file src/timer.h
* @brief Some timing classes for debugging and profiling.
*/
#ifndef DCPOMATIC_TIMER_H
#define DCPOMATIC_TIMER_H
#include <sys/time.h>
#include <boost/optional.hpp>
#include <string>
#include <map>
/** @class PeriodTimer
* @brief A class to allow timing of a period within the caller.
*
* On destruction, it will output the time since its construction.
*/
class PeriodTimer
{
public:
explicit PeriodTimer (std::string n);
~PeriodTimer ();
private:
/** name to use when giving output */
std::string _name;
/** time that this class was constructed */
struct timeval _start;
};
/** @class StateTimer
* @brief A class to allow measurement of the amount of time a program
* spends in one of a set of states.
*
* Once constructed, the caller can call set_state() whenever
* its state changes. When StateTimer is destroyed, it will
* output (to cout) a summary of the time spent in each state.
*/
class StateTimer
{
public:
explicit StateTimer (std::string n);
/** @param n Name to use when giving output.
* @param s Initial state.
*/
StateTimer (std::string n, std::string s);
~StateTimer ();
/** @param s New state that the caller is in */
void set (std::string s);
void unset ();
std::string name () const {
return _name;
}
class Counts
{
public:
double total_time = 0;
int number = 0;
};
std::map<std::string, Counts> counts () const {
return _counts;
}
private:
void set_internal (boost::optional<std::string> s);
/** name to add to the output */
std::string _name;
/** current state */
boost::optional<std::string> _state;
/** time that _state was entered */
double _time = 0;
/** total time and number of entries for each state */
std::map<std::string, Counts> _counts;
};
#endif
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