FairRunIdGenerator.h

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/********************************************************************************
 *    Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
 *                                                                              *
 *              This software is distributed under the terms of the             *
 *              GNU Lesser General Public Licence (LGPL) version 3,             *
 *                  copied verbatim in the file "LICENSE"                       *
 ********************************************************************************/
#ifndef FAIRRUNIDGENERATOR_H
#define FAIRRUNIDGENERATOR_H

#include <time.h>   // IWYU pragma: keep for timespec
// IWYU pragma: no_include <sys/_structs.h>

typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
typedef unsigned char uuid_t[16];

class FairRunIdGenerator
{
    struct uuid
    {
        uint32_t time_low;
        uint16_t time_mid;
        uint16_t time_hi_and_version;
        uint16_t clock_seq;
        uint8_t node[6];
    };

    struct timespec fTimeSpec;

    int get_random_fd(void);
    void get_random_bytes(void*, int);
    int get_node_id(unsigned char*);
    int get_clock(uint32_t*, uint32_t*, uint16_t*);
    void uuid_generate_time(uuid_t);
    void uuid_generate_random(uuid_t);
    void uuid_generate(uuid_t);
    void uuid_pack(const struct uuid*, uuid_t);
    void uuid_unpack(const uuid_t, struct uuid*);

  public:
    struct timespec getTimeSpec() { return fTimeSpec; }
    struct timespec getTimeSpecFromTID(unsigned int ms);
    unsigned int getTID();

  public:
    FairRunIdGenerator()
        : fTimeSpec()
    {}
    ~FairRunIdGenerator() {}
    unsigned int generateId(void);
};

#endif