tracked.h

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// Copyright (c) 2021, Aalto University, developed by Erik Schultheis
// All rights reserved.
//
// SPDX-License-Identifier: MIT
 
#ifndef DISMEC_STATS_TRACKED_H
#define DISMEC_STATS_TRACKED_H
 
#include <memory>
#include "stat_id.h"
 
namespace dismec::stats {
    class StatisticsCollection;
    class Statistics;
    class ScopeTimer;
 
    class Tracked {
    public:
        Tracked();
 
        void register_stat(const std::string& name, std::unique_ptr<Statistics> stat);
 
        [[nodiscard]] std::shared_ptr<StatisticsCollection> get_stats() const {
            return m_Collection;
        }
    private:
        template<class T, class... Args>
        T& make_dependent(T& t) {
            return t;
        }
 
    protected:
        ~Tracked();
 
        template<class T>
        void record(stat_id_t stat, T&& value) {
            // make m_Collection dependent, so it only needs to be a complete type where we actually call this function
            make_dependent<StatisticsCollection&, T>(*m_Collection).record(stat, std::forward<T>(value));
        }
 
        void declare_stat(stat_id_t index, StatisticMetaData meta);
 
        void declare_tag(tag_id_t index, std::string name);
 
 
        template<class... Args>
        void set_tag(tag_id_t tag, long value) {
            static_assert(sizeof...(Args) == 0, "Unsupported extra args");
            // make m_Collection dependent, so it only needs to be a complete type where we actually call this function
            make_dependent<StatisticsCollection&, Args...>(*m_Collection).set_tag(tag, value);
        }
 
        template<class... Args>
        auto make_timer(stat_id_t id, Args... args) {
            // check that we don't accidentally use the dummy args in any way
            static_assert(sizeof...(Args) == 0, "Unsupported extra args");
            return record_scope_time(*m_Collection, id, args...);
        }
 
    private:
        std::shared_ptr<StatisticsCollection> m_Collection;
    };
}
 
#endif //DISMEC_STATS_TRACKED_H