stats.h

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// -*- mode: c++; tab-width: 4; indent-tabs-mode: t; c-file-style: "stroustrup"; -*-
// vi:set ts=4 sts=4 sw=4 noet :
// Copyright 2008, 2012, The TPIE development team
// 
// This file is part of TPIE.
// 
// TPIE is free software: you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
// 
// TPIE 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 Lesser General Public
// License for more details.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with TPIE.  If not, see <http://www.gnu.org/licenses/>
 
 
#ifndef _TPIE_STATS_H
#define _TPIE_STATS_H
 
#include <tpie/tpie_export.h>
#include <tpie/types.h>
#include <chrono>
 
namespace tpie {
 
    TPIE_EXPORT stream_size_type get_temp_file_usage();
 
    TPIE_EXPORT void increment_temp_file_usage(stream_offset_type delta);
 
    TPIE_EXPORT stream_size_type get_bytes_read();
 
    TPIE_EXPORT stream_size_type get_bytes_written();
 
    TPIE_EXPORT void increment_bytes_read(stream_size_type delta);
 
    TPIE_EXPORT void increment_bytes_written(stream_size_type delta);
 
    TPIE_EXPORT stream_size_type get_user(size_t i);
    TPIE_EXPORT void increment_user(size_t i, stream_size_type delta);
 
class ptime {
private:
    typedef std::chrono::steady_clock clock;
    typedef std::chrono::time_point<clock> time_point;
public:
    ptime() {}
 
    static ptime now() {return clock::now();}
 
    static double seconds(const ptime & t1, const ptime & t2) {
        return std::chrono::duration_cast<std::chrono::duration<double>>(
            t2.m_ptime - t1.m_ptime).count();
    }
 
private:
    time_point m_ptime;
 
    ptime(time_point ptime): m_ptime(ptime) {}
};
 
class stat_timer {
public:
    stat_timer(size_t i)
        : i(i)
        , t1(ptime::now())
    {
    }
 
    ~stat_timer() {
        ptime t2 = ptime::now();
        increment_user(i, (stream_size_type)(ptime::seconds(t1, t2)*1000000));
    }
 
private:
    size_t i;
    ptime t1;
};
 
}  //  tpie namespace
#endif //_TPIE_STATS_H