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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* vim: ts=4 sw=4 et tw=0 wm=0
*
* libcola - A library providing force-directed network layout using the
* stress-majorization method subject to separation constraints.
*
* Copyright (C) 2006-2008 Monash University
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
* See the file LICENSE.LGPL distributed with the library.
*
* 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.
*
*/
/*
Logging code from DJJ article: http://www.ddj.com/cpp/201804215.
Title: Logging In C++
Author: Petru Marginean
Keywords: OCT07 C++
Description: Unpublished source code accompanying the article by Petru Marginean, in which he presents a C++ logging framework that is typesafe, thread-safe, and portable.
*/
#ifndef __COLA_LOG_H__
#define __COLA_LOG_H__
#include <sstream>
#include <string>
#include <cstdio>
#include <iomanip>
namespace cola {
inline std::string NowTime();
enum TLogLevel {logERROR, logWARNING, logINFO, logDEBUG, logDEBUG1, logDEBUG2, logDEBUG3, logDEBUG4};
template <typename T>
class Log
{
public:
Log();
virtual ~Log();
std::ostringstream& Get(TLogLevel level = logINFO);
public:
static TLogLevel& ReportingLevel();
static std::string ToString(TLogLevel level);
static TLogLevel FromString(const std::string& level);
protected:
std::ostringstream os;
private:
Log(const Log&);
Log& operator =(const Log&);
};
template <typename T>
Log<T>::Log()
{
}
template <typename T>
std::ostringstream& Log<T>::Get(TLogLevel level)
{
os << "- " << NowTime();
os << " " << ToString(level) << ": ";
os << std::string(level > logDEBUG ? level - logDEBUG : 0, '\t');
return os;
}
template <typename T>
Log<T>::~Log()
{
os << std::endl;
T::Output(os.str());
}
template <typename T>
TLogLevel& Log<T>::ReportingLevel()
{
static TLogLevel reportingLevel = cola::logDEBUG4;
return reportingLevel;
}
template <typename T>
std::string Log<T>::ToString(TLogLevel level)
{
static const char* const buffer[] = {"ERROR", "WARNING", "INFO", "DEBUG", "DEBUG1", "DEBUG2", "DEBUG3", "DEBUG4"};
return buffer[level];
}
template <typename T>
TLogLevel Log<T>::FromString(const std::string& level)
{
if (level == "DEBUG4")
return logDEBUG4;
if (level == "DEBUG3")
return logDEBUG3;
if (level == "DEBUG2")
return logDEBUG2;
if (level == "DEBUG1")
return logDEBUG1;
if (level == "DEBUG")
return logDEBUG;
if (level == "INFO")
return logINFO;
if (level == "WARNING")
return logWARNING;
if (level == "ERROR")
return logERROR;
Log<T>().Get(logWARNING) << "Unknown logging level '" << level << "'. Using INFO level as default.";
return logINFO;
}
class Output2FILE
{
public:
static FILE*& Stream();
static void Output(const std::string& msg);
};
inline FILE*& Output2FILE::Stream()
{
static FILE* pStream = stderr;
return pStream;
}
inline void Output2FILE::Output(const std::string& msg)
{
FILE* pStream = Stream();
if (!pStream)
return;
fprintf(pStream, "%s", msg.c_str());
fflush(pStream);
}
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
# if defined (BUILDING_FILELOG_DLL)
# define FILELOG_DECLSPEC __declspec (dllexport)
# elif defined (USING_FILELOG_DLL)
# define FILELOG_DECLSPEC __declspec (dllimport)
# else
# define FILELOG_DECLSPEC
# endif // BUILDING_DBSIMPLE_DLL
#else
# define FILELOG_DECLSPEC
#endif // _WIN32
class FILELOG_DECLSPEC FILELog : public Log<Output2FILE> {};
//typedef Log<Output2FILE> FILELog;
#ifndef FILELOG_MAX_LEVEL
#define FILELOG_MAX_LEVEL cola::logDEBUG4
#endif
#define FILE_LOG(level) \
if (level > FILELOG_MAX_LEVEL) ;\
else if (level > cola::FILELog::ReportingLevel() || !cola::Output2FILE::Stream()) ; \
else cola::FILELog().Get(level)
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
#include <windows.h>
inline std::string NowTime()
{
const int MAX_LEN = 200;
char buffer[MAX_LEN];
if (GetTimeFormatA(LOCALE_USER_DEFAULT, 0, 0,
"HH':'mm':'ss", buffer, MAX_LEN) == 0)
return "Error in NowTime()";
static DWORD first = GetTickCount();
std::stringstream result;
result << buffer << "." << std::setfill('0') << std::setw(3) << ((long)(GetTickCount() - first) % 1000);
return result.str();
}
#else
#include <sys/time.h>
inline std::string NowTime()
{
char buffer[11];
time_t t;
time(&t);
tm r;
strftime(buffer, sizeof(buffer), "%X", localtime_r(&t, &r));
struct timeval tv;
gettimeofday(&tv, 0);
std::stringstream result;
result << buffer << "." << std::setfill('0') << std::setw(3) << ((long)tv.tv_usec / 1000);
return result.str();
}
#endif //WIN32
} // namespace cola
#endif //__COLA_LOG_H__
|
