Merge

1 files changed, 120 insertions, 0 deletions

diff --git a/indra/llcommon/llstatsaccumulator.h b/indra/llcommon/llstatsaccumulator.h
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+++ b/indra/llcommon/llstatsaccumulator.h
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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