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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 F4EXB //
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// written by Edouard Griffiths //
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// //
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// Object unique id calculator loosely inspired by MongoDB object id //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QDateTime>
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#include <QTime>
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#include <QCoreApplication>
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#include <QHostInfo>
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#include <QCryptographicHash>
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#ifdef _WIN32_
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#include <windows.h>
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#else
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#include <sys/time.h>
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#endif
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#include "uid.h"
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uint64_t UidCalculator::getNewObjectId()
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{
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QDateTime currentDateTime = QDateTime::currentDateTime();
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uint64_t uid = currentDateTime.toTime_t();
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uid *= 1000000UL; // make room for microseconds
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// Fallback to milliseconds:
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// QTime timeNow = QTime::currentTime();
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// uint64_t usecs = timeNow.msec() * 1000UL;
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// uid += usecs;
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uid += getCurrentMiroseconds();
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return uid;
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}
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uint32_t UidCalculator::getNewInstanceId()
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{
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uint32_t uid = (QCoreApplication::applicationPid() % (1<<16));
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QString hostname = QHostInfo::localHostName();
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QByteArray hashKey = QCryptographicHash::hash(hostname.toUtf8(), QCryptographicHash::Sha1);
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uint32_t hashHost = 0;
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for (int i = 0; i < hashKey.size(); i++) {
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char c = hashKey.at(i);
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hashHost += (uint32_t) c;
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}
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hashHost %= (1<<16);
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uid += (hashHost<<16);
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return uid;
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}
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uint64_t UidCalculator::getCurrentMiroseconds()
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{
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#ifdef _WIN32_
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LARGE_INTEGER tickPerSecond;
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LARGE_INTEGER tick; // a point in time
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// get the high resolution counter's accuracy
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QueryPerformanceFrequency(&tickPerSecond);
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// what time is it ?
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QueryPerformanceCounter(&tick);
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// and here we get the current microsecond! \o/
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return (tick.QuadPart % tickPerSecond.QuadPart);
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#else
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struct timeval tv;
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gettimeofday(&tv, 0);
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return tv.tv_usec;
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#endif
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}
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