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102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "MPL"); you may not use this file except in
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* compliance with the MPL. You may obtain a copy of the MPL at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the MPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the MPL
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* for the specific language governing rights and limitations under the
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* MPL.
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*
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* The Initial Developer of this code under the MPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1999 Netscape Communications Corporation. All Rights
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* Reserved.
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*
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* Original Author:
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* Chris Waterson <waterson@netscape.com>
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*/
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#include "nsStatistics.h"
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#include "nsISupportsUtils.h"
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#include "nsTraceRefcnt.h" // for NS_MeanAndStdDev
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#include "plhash.h"
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inline PLHashNumber
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nsStatistics::HashPRInt32(const void* aKey)
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{
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return PLHashNumber(aKey);
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}
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nsStatistics::nsStatistics(const char* aTopic)
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: mTopic(aTopic),
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mDistribution(nsnull),
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mCount(0),
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mMinimum(0),
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mMaximum(0),
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mSum(0),
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mSumOfSquares(0)
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{
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mDistribution = PL_NewHashTable(24, HashPRInt32, PL_CompareValues, PL_CompareValues, nsnull, nsnull);
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}
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nsStatistics::~nsStatistics()
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{
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PL_HashTableDestroy(mDistribution);
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}
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void
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nsStatistics::Clear()
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{
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PL_HashTableDestroy(mDistribution);
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mCount = mMinimum = mMaximum = 0;
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mSum = mSumOfSquares = 0.0;
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mDistribution = PL_NewHashTable(24, HashPRInt32, PL_CompareValues, PL_CompareValues, nsnull, nsnull);
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}
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void
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nsStatistics::Record(PRInt32 aValue)
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{
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++mCount;
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if (aValue < mMinimum)
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mMinimum = aValue;
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if (aValue > mMaximum)
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mMaximum = aValue;
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mSum += aValue;
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mSumOfSquares += aValue * aValue;
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PLHashEntry** hep = PL_HashTableRawLookup(mDistribution, PLHashNumber(aValue),
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NS_REINTERPRET_CAST(const void*, aValue));
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if (hep && *hep) {
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PRInt32 count = NS_REINTERPRET_CAST(PRUint32, (*hep)->value);
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(*hep)->value = NS_REINTERPRET_CAST(void*, ++count);
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}
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else {
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PL_HashTableRawAdd(mDistribution, hep, PLHashNumber(aValue),
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NS_REINTERPRET_CAST(const void*, aValue),
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NS_REINTERPRET_CAST(void*, 1));
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}
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}
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void
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nsStatistics::Print(FILE* aFile)
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{
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double mean, stddev;
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NS_MeanAndStdDev(mCount, mSum, mSumOfSquares, &mean, &stddev);
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fprintf(aFile, "%s count=%d, minimum=%d, maximum=%d, mean=%0.2f+/-%0.2f\n",
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mTopic, mCount, mMinimum, mMaximum, mean, stddev);
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for (PRInt32 i = mMinimum; i < mMaximum; ++i) {
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PRUint32 count = NS_REINTERPRET_CAST(PRUint32, PL_HashTableLookup(mDistribution, NS_REINTERPRET_CAST(const void*, i)));
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if (! count)
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continue;
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fprintf(aFile, " %d: %d\n", i, count);
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}
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}
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