1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/**
* @file llsimplestat.h
* @brief Runtime statistics accumulation.
*
* $LicenseInfo:firstyear=2010&license=viewerlgpl$
* 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_SIMPLESTAT_H
#define LL_SIMPLESTAT_H
// History
//
// The original source for this code is the server repositories'
// llcommon/llstat.h file. This particular code was added after the
// viewer/server code schism but before the effort to convert common
// code to libraries was complete. Rather than add to merge issues,
// the needed code was cut'n'pasted into this new header as it isn't
// too awful a burden. Post-modularization, we can look at removing
// this redundancy.
/**
* @class LLSimpleStatCounter
* @brief Just counts events.
*
* Really not needed but have a pattern in mind in the future.
* Interface limits what can be done at that's just fine.
*
* *TODO: Update/transfer unit tests
* Unit tests: indra/test/llcommon_llstat_tut.cpp
*/
class LLSimpleStatCounter
{
public:
inline LLSimpleStatCounter() { reset(); }
// Default destructor and assignment operator are valid
inline void reset() { mCount = 0; }
inline void merge(const LLSimpleStatCounter & src)
{ mCount += src.mCount; }
inline U32 operator++() { return ++mCount; }
inline U32 getCount() const { return mCount; }
protected:
U32 mCount;
};
/**
* @class LLSimpleStatMMM
* @brief Templated collector of min, max and mean data for stats.
*
* Fed a stream of data samples, keeps a running account of the
* min, max and mean seen since construction or the last reset()
* call. A freshly-constructed or reset instance returns counts
* and values of zero.
*
* Overflows and underflows (integer, inf or -inf) and NaN's
* are the caller's problem. As is loss of precision when
* the running sum's exponent (when parameterized by a floating
* point of some type) differs from a given data sample's.
*
* Unit tests: indra/test/llcommon_llstat_tut.cpp
*/
template <typename VALUE_T = F32>
class LLSimpleStatMMM
{
public:
typedef VALUE_T Value;
public:
LLSimpleStatMMM() { reset(); }
// Default destructor and assignment operator are valid
/**
* Resets the object returning all counts and derived
* values back to zero.
*/
void reset()
{
mCount = 0;
mMin = Value(0);
mMax = Value(0);
mTotal = Value(0);
}
void record(Value v)
{
if (mCount)
{
mMin = llmin(mMin, v);
mMax = llmax(mMax, v);
}
else
{
mMin = v;
mMax = v;
}
mTotal += v;
++mCount;
}
void merge(const LLSimpleStatMMM<VALUE_T> & src)
{
if (! mCount)
{
*this = src;
}
else if (src.mCount)
{
mMin = llmin(mMin, src.mMin);
mMax = llmax(mMax, src.mMax);
mCount += src.mCount;
mTotal += src.mTotal;
}
}
inline U32 getCount() const { return mCount; }
inline Value getMin() const { return mMin; }
inline Value getMax() const { return mMax; }
inline Value getMean() const { return mCount ? mTotal / mCount : mTotal; }
protected:
U32 mCount;
Value mMin;
Value mMax;
Value mTotal;
};
#endif // LL_SIMPLESTAT_H
|
