mirror of https://github.com/Icinga/icinga2.git
41 lines
989 B
C++
41 lines
989 B
C++
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
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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(String attr)
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: m_StdAttr(std::move(attr))
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{ }
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StdAggregatorState *StdAggregator::EnsureState(AggregatorState **state)
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{
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if (!*state)
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*state = new StdAggregatorState();
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return static_cast<StdAggregatorState *>(*state);
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}
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void StdAggregator::Apply(const Table::Ptr& table, const Value& row, AggregatorState **state)
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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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StdAggregatorState *pstate = EnsureState(state);
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pstate->StdSum += value;
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pstate->StdQSum += pow(value, 2);
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pstate->StdCount++;
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}
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double StdAggregator::GetResultAndFreeState(AggregatorState *state) const
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{
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StdAggregatorState *pstate = EnsureState(&state);
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double result = sqrt((pstate->StdQSum - (1 / pstate->StdCount) * pow(pstate->StdSum, 2)) / (pstate->StdCount - 1));
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delete pstate;
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return result;
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}
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