mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-23 16:38:37 -05:00
89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
|
///////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// Copyright (C) 2017 F4EXB //
|
||
|
|
// written by Edouard Griffiths //
|
||
|
|
// //
|
||
|
|
// Object unique id calculator loosely inspired by MongoDB object id //
|
||
|
|
// //
|
||
|
|
// 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 as version 3 of the License, or //
|
||
|
|
// //
|
||
|
|
// 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 V3 for more details. //
|
||
|
|
// //
|
||
|
|
// You should have received a copy of the GNU General Public License //
|
||
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
||
|
|
///////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
#include <QDateTime>
|
||
|
|
#include <QTime>
|
||
|
|
#include <QCoreApplication>
|
||
|
|
#include <QHostInfo>
|
||
|
|
#include <QCryptographicHash>
|
||
|
|
|
||
|
|
#ifdef _WIN32_
|
||
|
|
#include <windows.h>
|
||
|
|
#else
|
||
|
|
#include <sys/time.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "uid.h"
|
||
|
|
|
||
|
|
uint64_t UidCalculator::getNewObjectId()
|
||
|
|
{
|
||
|
|
QDateTime currentDateTime = QDateTime::currentDateTime();
|
||
|
|
uint64_t uid = currentDateTime.toTime_t();
|
||
|
|
uid *= 1000000UL; // make room for microseconds
|
||
|
|
|
||
|
|
// Fallback to milliseconds:
|
||
|
|
// QTime timeNow = QTime::currentTime();
|
||
|
|
// uint64_t usecs = timeNow.msec() * 1000UL;
|
||
|
|
// uid += usecs;
|
||
|
|
uid += getCurrentMiroseconds();
|
||
|
|
|
||
|
|
return uid;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t UidCalculator::getNewInstanceId()
|
||
|
|
{
|
||
|
|
uint32_t uid = (QCoreApplication::applicationPid() % (1<<16));
|
||
|
|
|
||
|
|
QString hostname = QHostInfo::localHostName();
|
||
|
|
QByteArray hashKey = QCryptographicHash::hash(hostname.toUtf8(), QCryptographicHash::Sha1);
|
||
|
|
uint32_t hashHost = 0;
|
||
|
|
|
||
|
|
for (int i = 0; i < hashKey.size(); i++) {
|
||
|
|
char c = hashKey.at(i);
|
||
|
|
hashHost += (uint32_t) c;
|
||
|
|
}
|
||
|
|
|
||
|
|
hashHost %= (1<<16);
|
||
|
|
uid += (hashHost<<16);
|
||
|
|
|
||
|
|
return uid;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t UidCalculator::getCurrentMiroseconds()
|
||
|
|
{
|
||
|
|
#ifdef _WIN32_
|
||
|
|
LARGE_INTEGER tickPerSecond;
|
||
|
|
LARGE_INTEGER tick; // a point in time
|
||
|
|
|
||
|
|
// get the high resolution counter's accuracy
|
||
|
|
QueryPerformanceFrequency(&tickPerSecond);
|
||
|
|
|
||
|
|
// what time is it ?
|
||
|
|
QueryPerformanceCounter(&tick);
|
||
|
|
|
||
|
|
// and here we get the current microsecond! \o/
|
||
|
|
return (tick.QuadPart % tickPerSecond.QuadPart);
|
||
|
|
#else
|
||
|
|
struct timeval tv;
|
||
|
|
gettimeofday(&tv, 0);
|
||
|
|
return tv.tv_usec;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|