mirror of https://github.com/Icinga/icinga2.git
44 lines
2.0 KiB
C++
44 lines
2.0 KiB
C++
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/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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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 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, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "livestatus/stdaggregator.hpp"
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#include <math.h>
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using namespace icinga;
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StdAggregator::StdAggregator(const String& attr)
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: m_StdSum(0), m_StdQSum(0), m_StdCount(0), m_StdAttr(attr)
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{ }
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void StdAggregator::Apply(const Table::Ptr& table, const Value& row)
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{
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Column column = table->GetColumn(m_StdAttr);
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Value value = column.ExtractValue(row);
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m_StdSum += value;
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m_StdQSum += pow(value, 2);
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m_StdCount++;
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}
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double StdAggregator::GetResult(void) const
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{
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return sqrt((m_StdQSum - (1 / m_StdCount) * pow(m_StdSum, 2)) / (m_StdCount - 1));
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}
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