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// Copyright (C) 2003-2016 Anders Logg, 2015 Jan Blechta
//
// This file is part of DOLFINx (https://www.fenicsproject.org)
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
#include "Table.h"
#include "timing.h"
#include <chrono>
#include <map>
#include <mpi.h>
#include <string>
#include <utility>
namespace dolfinx::common
{
/// @brief Time logger maintaining data collected by Timer, if registered.
///
/// @note This is a monotstate, i.e. the data members are static and thus
/// timings are aggregated into a single map.
class TimeLogger
{
public:
/// @brief Singleton access.
/// @return Unique time logger object.
static TimeLogger& instance();
/// Register timing (for later summary)
void register_timing(const std::string& task,
std::chrono::duration<double, std::ratio<1>> wall);
/// Return a summary of timings and tasks in a Table
Table timing_table() const;
/// List a summary of timings and tasks. Reduction type is
/// printed.
/// @param comm MPI Communicator
/// @param reduction Reduction type (min, max or average)
void list_timings(MPI_Comm comm, Table::Reduction reduction) const;
/// @brief Return timing.
/// @param[in] task The task name to retrieve the timing for
/// @return Values (count, total wall time) for given task.
std::pair<int, std::chrono::duration<double, std::ratio<1>>>
timing(const std::string& task) const;
/// @brief Logged elapsed times.
/// @return Elapsed [task id: (count, total wall time)].
std::map<std::string,
std::pair<int, std::chrono::duration<double, std::ratio<1>>>>
timings() const;
private:
/// Constructor
TimeLogger() = default;
// This class is used as a singleton and thus should not allow copies.
TimeLogger(const TimeLogger&) = delete;
// This class is used as a singleton and thus should not allow copies.
TimeLogger& operator=(const TimeLogger&) = delete;
/// Destructor
~TimeLogger() = default;
// List of timings for tasks, map from string to (num_timings,
// total_wall_time)
std::map<std::string,
std::pair<int, std::chrono::duration<double, std::ratio<1>>>>
_timings;
};
} // namespace dolfinx::common
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