span_id_generator.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2025 Marco Craveiro <marco.craveiro@gmail.com>
 *
 * This program 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 3 of the License, or (at your option) any later
 * version.
 *
 * This program 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
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#ifndef ORES_TELEMETRY_GENERATORS_SPAN_ID_GENERATOR_HPP
#define ORES_TELEMETRY_GENERATORS_SPAN_ID_GENERATOR_HPP
 
#include <atomic>
#include <cstdint>
#include <random>
#include <mutex>
#include "ores.telemetry/domain/span_id.hpp"
 
namespace ores::telemetry::generators {
 
class span_id_generator final {
public:
    span_id_generator();
 
    domain::span_id operator()();
 
private:
    std::atomic<std::uint16_t> sequence_;
    std::uint64_t last_timestamp_ms_;
    std::mt19937 random_engine_;
    mutable std::mutex mutex_;
};
 
}
 
#endif