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/**
* @file llstatsaccumulator.h
* @brief Class for accumulating statistics.
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_STATS_ACCUMULATOR_H
#define LL_STATS_ACCUMULATOR_H
#include "llsd.h"
class LLStatsAccumulator
{
public:
inline LLStatsAccumulator()
{
reset();
}
inline void push(F32 val)
{
if (mCountOfNextUpdatesToIgnore > 0)
{
mCountOfNextUpdatesToIgnore--;
return;
}
mCount++;
mSum += val;
mSumOfSquares += val * val;
if (mCount == 1 || val > mMaxValue)
{
mMaxValue = val;
}
if (mCount == 1 || val < mMinValue)
{
mMinValue = val;
}
}
inline F32 getSum() const
{
return mSum;
}
inline F32 getMean() const
{
return (mCount == 0) ? 0.f : ((F32)mSum) / mCount;
}
inline F32 getMinValue() const
{
return mMinValue;
}
inline F32 getMaxValue() const
{
return mMaxValue;
}
inline F32 getStdDev() const
{
const F32 mean = getMean();
return (mCount < 2) ? 0.f : sqrt(llmax(0.f, mSumOfSquares / mCount - (mean * mean)));
}
inline U32 getCount() const
{
return mCount;
}
inline void reset()
{
mCount = 0;
mSum = mSumOfSquares = 0.f;
mMinValue = 0.0f;
mMaxValue = 0.0f;
mCountOfNextUpdatesToIgnore = 0;
}
inline LLSD asLLSD() const
{
LLSD data;
data["mean"] = getMean();
data["std_dev"] = getStdDev();
data["count"] = (S32)mCount;
data["min"] = getMinValue();
data["max"] = getMaxValue();
return data;
}
private:
S32 mCount;
F32 mSum;
F32 mSumOfSquares;
F32 mMinValue;
F32 mMaxValue;
U32 mCountOfNextUpdatesToIgnore;
};
#endif
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