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annotate Core/Logging.cpp @ 1551:0dba274074eb

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standalone logging
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 18 Aug 2015 14:57:41 +0200
parents 46b2794042d6
children b6f656a0bf2c
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "PrecompiledHeaders.h"
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34 #include "Logging.h"
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35
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36 #if ORTHANC_ENABLE_LOGGING != 1
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37
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38 namespace Orthanc
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39 {
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40 namespace Logging
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41 {
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42 void Initialize()
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43 {
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44 }
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45
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46 void Finalize()
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47 {
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48 }
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49
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50 void EnableInfoLevel(bool enabled)
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51 {
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52 }
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53
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54 void EnableTraceLevel(bool enabled)
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55 {
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56 }
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57
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58 void SetTargetFolder(const std::string& path)
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59 {
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60 }
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61 }
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62 }
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63
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64 #elif ORTHANC_ENABLE_GOOGLE_LOG == 1
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65
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66 /*********************************************************
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67 * Wrapper around Google Log
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68 *********************************************************/
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69
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70 namespace Orthanc
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71 {
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72 namespace Logging
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73 {
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74 void Initialize()
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75 {
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76 // Initialize Google's logging library.
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77 FLAGS_logtostderr = true;
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78 FLAGS_minloglevel = 1; // Do not print LOG(INFO) by default
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79 FLAGS_v = 0; // Do not print trace-level VLOG(1) by default
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80
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81 google::InitGoogleLogging("Orthanc");
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82 }
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83
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84 void Finalize()
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85 {
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86 google::ShutdownGoogleLogging();
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87 }
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88
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89 void EnableInfoLevel(bool enabled)
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90 {
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91 FLAGS_minloglevel = (enabled ? 0 : 1);
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92 }
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93
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94 void EnableTraceLevel(bool enabled)
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95 {
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96 if (enabled)
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97 {
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98 FLAGS_minloglevel = 0;
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99 FLAGS_v = 1;
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100 }
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101 else
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102 {
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103 FLAGS_v = 0;
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104 }
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105 }
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106
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107 void SetTargetFolder(const std::string& path)
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108 {
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109 FLAGS_logtostderr = false;
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110 FLAGS_log_dir = path;
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111 }
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112 }
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113 }
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114
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115 #else
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116
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117 /*********************************************************
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118 * Use internal logger, not Google Log
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119 *********************************************************/
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120
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121 #include "OrthancException.h"
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122 #include "Enumerations.h"
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123 #include "Toolbox.h"
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124
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125 #include <fstream>
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126 #include <boost/filesystem.hpp>
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127 #include <boost/thread.hpp>
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128
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129 #if BOOST_HAS_DATE_TIME == 1
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130 # include <boost/date_time/posix_time/posix_time.hpp>
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131 #else
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132 # error Boost::date_time is required
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133 #endif
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134
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135
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136 namespace
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137 {
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138 struct LoggingState
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139 {
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140 bool infoEnabled_;
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141 bool traceEnabled_;
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142
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143 std::ostream* error_;
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144 std::ostream* warning_;
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145 std::ostream* info_;
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146
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147 std::auto_ptr<std::ofstream> errorFile_;
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148 std::auto_ptr<std::ofstream> warningFile_;
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149 std::auto_ptr<std::ofstream> infoFile_;
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150
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151 LoggingState() :
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152 infoEnabled_(false),
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153 traceEnabled_(false),
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154 error_(&std::cerr),
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155 warning_(&std::cerr),
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156 info_(&std::cerr)
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157 {
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158 }
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159 };
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160 }
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161
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162
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163
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164 static std::auto_ptr<LoggingState> loggingState_;
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165 static boost::mutex loggingMutex_;
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166
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167
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168
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169 namespace Orthanc
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170 {
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171 namespace Logging
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172 {
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173 static void GetLogPath(boost::filesystem::path& log,
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174 boost::filesystem::path& link,
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175 const char* level,
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176 const std::string& directory)
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177 {
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178 /**
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179 From Google Log documentation:
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180
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181 Unless otherwise specified, logs will be written to the filename
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182 "<program name>.<hostname>.<user name>.log.<severity level>.",
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183 followed by the date, time, and pid (you can't prevent the date,
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184 time, and pid from being in the filename).
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185
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186 In this implementation : "hostname" and "username" are not used
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187 **/
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188
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189 boost::posix_time::ptime now = boost::posix_time::second_clock::local_time();
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190 boost::filesystem::path root(directory);
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191 boost::filesystem::path exe(Toolbox::GetPathToExecutable());
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192
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193 if (!boost::filesystem::exists(root) ||
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194 !boost::filesystem::is_directory(root))
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195 {
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196 throw OrthancException(ErrorCode_CannotWriteFile);
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197 }
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198
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199 char date[64];
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200 sprintf(date, "%04d%02d%02d-%02d%02d%02d.%d",
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201 static_cast<int>(now.date().year()),
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202 now.date().month().as_number(),
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203 now.date().day().as_number(),
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204 now.time_of_day().hours(),
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205 now.time_of_day().minutes(),
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206 now.time_of_day().seconds(),
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207 Toolbox::GetProcessId());
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208
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209 std::string programName = exe.filename().replace_extension("").string();
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210
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211 log = (root / (programName + ".log." +
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212 std::string(level) + "." +
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213 std::string(date)));
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214
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215 link = (root / (programName + "." + std::string(level)));
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216 }
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217
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218
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219 static void PrepareLogFile(std::ostream*& stream,
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220 std::auto_ptr<std::ofstream>& file,
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221 const char* level,
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222 const std::string& directory)
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223 {
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224 boost::filesystem::path log, link;
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225 GetLogPath(log, link, level, directory);
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226
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227 #if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__)))
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228 boost::filesystem::remove(link);
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229 boost::filesystem::create_symlink(log.filename(), link);
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230 #endif
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231
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232 file.reset(new std::ofstream(log.string().c_str()));
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233 stream = file.get();
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234 }
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235
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236
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237 void Initialize()
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238 {
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239 boost::mutex::scoped_lock lock(loggingMutex_);
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240 loggingState_.reset(new LoggingState);
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241 }
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242
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243 void Finalize()
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244 {
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245 boost::mutex::scoped_lock lock(loggingMutex_);
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246 loggingState_.reset(NULL);
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247 }
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248
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249 void EnableInfoLevel(bool enabled)
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250 {
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251 boost::mutex::scoped_lock lock(loggingMutex_);
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252 assert(loggingState_.get() != NULL);
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253
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254 loggingState_->infoEnabled_ = enabled;
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255 }
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256
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257 void EnableTraceLevel(bool enabled)
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258 {
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259 boost::mutex::scoped_lock lock(loggingMutex_);
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260 assert(loggingState_.get() != NULL);
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261
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262 loggingState_->traceEnabled_ = enabled;
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263
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264 if (enabled)
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265 {
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266 // Also enable the "INFO" level when trace-level debugging is enabled
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267 loggingState_->infoEnabled_ = true;
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268 }
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269 }
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270
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271 void SetTargetFolder(const std::string& path)
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272 {
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273 boost::mutex::scoped_lock lock(loggingMutex_);
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274 assert(loggingState_.get() != NULL);
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275
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276 PrepareLogFile(loggingState_->error_, loggingState_->errorFile_, "ERROR", path);
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277 PrepareLogFile(loggingState_->warning_, loggingState_->warningFile_, "WARNING", path);
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278 PrepareLogFile(loggingState_->info_, loggingState_->infoFile_, "INFO", path);
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279 }
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280
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281 InternalLogger::InternalLogger(const char* level,
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282 const char* file,
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283 int line) :
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284 lock_(loggingMutex_),
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285 stream_(&null_) // By default, logging to "/dev/null" is simulated
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286 {
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287 if (loggingState_.get() == NULL)
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288 {
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289 fprintf(stderr, "ERROR: Trying to log a message after the finalization of the logging engine\n");
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290 return;
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291 }
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292
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293 LogLevel l = StringToLogLevel(level);
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294
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295 if ((l == LogLevel_Info && !loggingState_->infoEnabled_) ||
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296 (l == LogLevel_Trace && !loggingState_->traceEnabled_))
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297 {
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298 // This logging level is disabled, directly exit and unlock
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299 // the mutex to speed-up things. The stream is set to "/dev/null"
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300 lock_.unlock();
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301 return;
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302 }
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303
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304 // Compute the header of the line, temporary release the lock as
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305 // this is a time-consuming operation
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306 lock_.unlock();
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307 std::string header;
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308
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309 {
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310 boost::filesystem::path path(file);
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311 boost::posix_time::ptime now = boost::posix_time::microsec_clock::local_time();
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312 boost::posix_time::time_duration duration = now.time_of_day();
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313
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314 /**
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315 From Google Log documentation:
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316
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317 "Log lines have this form:
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318
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319 Lmmdd hh:mm:ss.uuuuuu threadid file:line] msg...
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320
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321 where the fields are defined as follows:
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322
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323 L A single character, representing the log level (eg 'I' for INFO)
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324 mm The month (zero padded; ie May is '05')
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325 dd The day (zero padded)
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326 hh:mm:ss.uuuuuu Time in hours, minutes and fractional seconds
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327 threadid The space-padded thread ID as returned by GetTID() (this matches the PID on Linux)
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328 file The file name
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329 line The line number
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330 msg The user-supplied message"
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331
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332 In this implementation, "threadid" is not printed.
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333 **/
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334
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335 char date[32];
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336 sprintf(date, "%c%02d%02d %02d:%02d:%02d.%06d ",
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337 level[0],
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338 now.date().month().as_number(),
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339 now.date().day().as_number(),
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340 duration.hours(),
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341 duration.minutes(),
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342 duration.seconds(),
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343 static_cast<int>(duration.fractional_seconds()));
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344
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345 header = std::string(date) + path.filename().string() + ":" + boost::lexical_cast<std::string>(line) + "] ";
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346 }
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347
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348
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349 // The header is computed, we now re-lock the mutex to access
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350 // the stream objects. Pay attention that "loggingState_",
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351 // "infoEnabled_" or "traceEnabled_" might have changed while
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352 // the mutex was unlocked.
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353 lock_.lock();
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354
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355 if (loggingState_.get() == NULL)
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356 {
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357 fprintf(stderr, "ERROR: Trying to log a message after the finalization of the logging engine\n");
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358 return;
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359 }
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360
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361 switch (l)
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362 {
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363 case LogLevel_Error:
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364 stream_ = loggingState_->error_;
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365 break;
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366
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367 case LogLevel_Warning:
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368 stream_ = loggingState_->warning_;
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369 break;
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370
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371 case LogLevel_Info:
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372 if (loggingState_->infoEnabled_)
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373 {
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374 stream_ = loggingState_->info_;
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375 }
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376
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377 break;
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378
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379 case LogLevel_Trace:
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380 if (loggingState_->traceEnabled_)
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381 {
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382 stream_ = loggingState_->info_;
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383 }
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384
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385 break;
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386
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387 default:
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388 throw OrthancException(ErrorCode_InternalError);
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389 }
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390
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391 if (stream_ == &null_)
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392 {
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393 // The logging is disabled for this level. The stream is the
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394 // "null_" member of this object, so we can release the global
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395 // mutex.
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396 lock_.unlock();
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397 }
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398
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399 (*stream_) << header;
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400 }
1507
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401
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402
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403 InternalLogger::~InternalLogger()
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404 {
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405 if (stream_ != &null_)
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406 {
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407 #if defined(_WIN32)
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408 *stream_ << "\r\n";
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409 #else
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410 *stream_ << "\n";
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411 #endif
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412
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413 stream_->flush();
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414 }
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415 }
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416
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417
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418 }
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419 }
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420
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421 #endif // ORTHANC_ENABLE_LOGGING