gecko-dev/xpcom/ds/nsStatistics.cpp

103 строки
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "MPL"); you may not use this file except in
* compliance with the MPL. You may obtain a copy of the MPL at
* http://www.mozilla.org/MPL/
*
* Software distributed under the MPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the MPL
* for the specific language governing rights and limitations under the
* MPL.
*
* The Initial Developer of this code under the MPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1999 Netscape Communications Corporation. All Rights
* Reserved.
*
* Original Author:
* Chris Waterson <waterson@netscape.com>
*/
#include "nscore.h"
#include "nsStatistics.h"
#include "nsISupportsUtils.h"
#include "nsTraceRefcntImpl.h" // for NS_MeanAndStdDev
#include "plhash.h"
inline PLHashNumber
nsStatistics::HashPRInt32(const void* aKey)
{
return PLHashNumber(NS_PTR_TO_INT32(aKey));
}
nsStatistics::nsStatistics(const char* aTopic)
: mTopic(aTopic),
mDistribution(nsnull),
mCount(0),
mMinimum(0),
mMaximum(0),
mSum(0),
mSumOfSquares(0)
{
mDistribution = PL_NewHashTable(24, HashPRInt32, PL_CompareValues, PL_CompareValues, nsnull, nsnull);
}
nsStatistics::~nsStatistics()
{
PL_HashTableDestroy(mDistribution);
}
void
nsStatistics::Clear()
{
PL_HashTableDestroy(mDistribution);
mCount = mMinimum = mMaximum = 0;
mSum = mSumOfSquares = 0.0;
mDistribution = PL_NewHashTable(24, HashPRInt32, PL_CompareValues, PL_CompareValues, nsnull, nsnull);
}
void
nsStatistics::Record(PRInt32 aValue)
{
++mCount;
if (aValue < mMinimum)
mMinimum = aValue;
if (aValue > mMaximum)
mMaximum = aValue;
mSum += aValue;
mSumOfSquares += aValue * aValue;
PLHashEntry** hep = PL_HashTableRawLookup(mDistribution, PLHashNumber(aValue),
NS_REINTERPRET_CAST(const void*, aValue));
if (hep && *hep) {
PRInt32 count = NS_PTR_TO_INT32((*hep)->value);
(*hep)->value = NS_REINTERPRET_CAST(void*, ++count);
}
else {
PL_HashTableRawAdd(mDistribution, hep, PLHashNumber(aValue),
NS_REINTERPRET_CAST(const void*, aValue),
NS_REINTERPRET_CAST(void*, 1));
}
}
void
nsStatistics::Print(FILE* aFile)
{
double mean, stddev;
NS_MeanAndStdDev(mCount, mSum, mSumOfSquares, &mean, &stddev);
fprintf(aFile, "%s count=%d, minimum=%d, maximum=%d, mean=%0.2f+/-%0.2f\n",
mTopic, mCount, mMinimum, mMaximum, mean, stddev);
for (PRInt32 i = mMinimum; i <= mMaximum; ++i) {
PRUint32 count = NS_PTR_TO_INT32(PL_HashTableLookup(mDistribution, NS_INT32_TO_PTR(i)));
if (! count)
continue;
fprintf(aFile, " %d: %d\n", i, count);
}
}