149 lines
3.7 KiB
C++
149 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2022-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include "stopwatch.h"
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <ctime>
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namespace base
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{
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StopWatch::StopWatch()
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{
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restart();
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}
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Duration StopWatch::lap() const
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{
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return {Clock::now() - m_start};
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}
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Duration StopWatch::restart()
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{
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TimePoint now = Clock::now();
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Duration lap = now - m_start;
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m_start = now;
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return lap;
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}
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} // base
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/********** OUTPUT ***********/
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namespace
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{
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using namespace base;
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struct TimeConvert
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{
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double div; // divide the value of the previous unit by this
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std::string suffix; // milliseconds, hours etc.
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double max_visual; // threashold to switch to the next unit
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};
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// Will never get to centuries because the duration is a long carrying nanoseconds
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TimeConvert convert[]
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{
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{1, "ns", 1000}, {1000, "us", 1000}, {1000, "ms", 1000},
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{1000, "s", 60}, {60, "min", 60}, {60, "hours", 24},
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{24, "days", 365.25}, {365.25, "years", 10000},
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{100, "centuries", std::numeric_limits<double>::max()}
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};
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int convert_size = sizeof(convert) / sizeof(convert[0]);
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}
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namespace base
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{
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std::pair<double, std::string> dur_to_human_readable(Duration dur)
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{
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using namespace std::chrono;
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double time = duration_cast<nanoseconds>(dur).count();
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bool negative = (time < 0) ? time = -time, true : false;
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for (int i = 0; i <= convert_size; ++i)
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{
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if (i == convert_size)
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{
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return std::make_pair(negative ? -time : time,
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convert[convert_size - 1].suffix);
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}
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time /= convert[i].div;
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if (time < convert[i].max_visual)
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{
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return std::make_pair(negative ? -time : time, convert[i].suffix);
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}
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}
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abort(); // should never get here
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}
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std::ostream& operator<<(std::ostream& os, Duration dur)
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{
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auto p = dur_to_human_readable(dur);
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os << p.first << p.second;
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return os;
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}
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// TODO: this will require some thought. time_point_to_string() for a system_clock is
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// obvious, but not so for a steady_clock. Maybe TimePoint belongs to a system clock
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// and sould be called something else here, and live in a time_measuring namespace.
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std::string time_point_to_string(TimePoint tp, const std::string &fmt)
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{
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using namespace std::chrono;
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std::time_t timet = system_clock::to_time_t(system_clock::now()
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+ (tp - Clock::now()));
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struct tm * ptm;
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ptm = gmtime(&timet);
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const int sz = 1024;
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char buf[sz];
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strftime(buf, sz, fmt.c_str(), ptm);
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return buf;
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}
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std::ostream & operator<<(std::ostream & os, TimePoint tp)
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{
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os << time_point_to_string(tp);
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return os;
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}
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void test_stopwatch_output(std::ostream & os)
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{
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long long dur[] =
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{
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400, // 400ns
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5 * 1000, // 5us
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500 * 1000, // 500us
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1 * 1000000, // 1ms
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700 * 1000000LL, // 700ms
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5 * 1000000000LL, // 5s
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200 * 1000000000LL, // 200s
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5 * 60 * 1000000000LL, // 5m
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45 * 60 * 1000000000LL, // 45m
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130 * 60 * 1000000000LL, // 130m
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24 * 60 * 60 * 1000000000LL, // 24 hours
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3 * 24 * 60 * 60 * 1000000000LL, // 72 hours
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180 * 24 * 60 * 60 * 1000000000LL, // 180 days
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1000 * 24 * 60 * 60 * 1000000000LL // 1000 days
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};
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for (unsigned i = 0; i < sizeof(dur) / sizeof(dur[0]); ++i)
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{
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os << Duration(dur[i]) << std::endl;
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}
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}
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} // base
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