mirror of https://github.com/Icinga/icinga2.git
44 lines
2.0 KiB
C++
44 lines
2.0 KiB
C++
/******************************************************************************
|
|
* Icinga 2 *
|
|
* Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/) *
|
|
* *
|
|
* 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; either version 2 *
|
|
* of the License, or (at your option) any later version. *
|
|
* *
|
|
* 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 for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU General Public License *
|
|
* along with this program; if not, write to the Free Software Foundation *
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
|
|
******************************************************************************/
|
|
|
|
#include "livestatus/stdaggregator.hpp"
|
|
#include <math.h>
|
|
|
|
using namespace icinga;
|
|
|
|
StdAggregator::StdAggregator(const String& attr)
|
|
: m_StdSum(0), m_StdQSum(0), m_StdCount(0), m_StdAttr(attr)
|
|
{ }
|
|
|
|
void StdAggregator::Apply(const Table::Ptr& table, const Value& row)
|
|
{
|
|
Column column = table->GetColumn(m_StdAttr);
|
|
|
|
Value value = column.ExtractValue(row);
|
|
|
|
m_StdSum += value;
|
|
m_StdQSum += pow(value, 2);
|
|
m_StdCount++;
|
|
}
|
|
|
|
double StdAggregator::GetResult(void) const
|
|
{
|
|
return sqrt((m_StdQSum - (1 / m_StdCount) * pow(m_StdSum, 2)) / (m_StdCount - 1));
|
|
}
|