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annotate Core/Logging.h @ 3992:f9863630ec7f

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working on the shared library for Orthanc framework
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 05 Jun 2020 16:07:01 +0200
parents 94f4a18a79cc
children 7e8bfda62b43
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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33
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34 #pragma once
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35
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36 // To have ORTHANC_ENABLE_LOGGING defined if using the shared library
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37 #include "OrthancFramework.h"
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38
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39 #include <iostream>
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40
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41 #if !defined(ORTHANC_ENABLE_LOGGING)
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42 # error The macro ORTHANC_ENABLE_LOGGING must be defined
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43 #endif
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44
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45 #if !defined(ORTHANC_ENABLE_LOGGING_PLUGIN)
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46 # if ORTHANC_ENABLE_LOGGING == 1
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47 # error The macro ORTHANC_ENABLE_LOGGING_PLUGIN must be defined
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48 # else
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49 # define ORTHANC_ENABLE_LOGGING_PLUGIN 0
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50 # endif
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51 #endif
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52
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53 #if !defined(ORTHANC_ENABLE_LOGGING_STDIO)
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54 # if ORTHANC_ENABLE_LOGGING == 1
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55 # error The macro ORTHANC_ENABLE_LOGGING_STDIO must be defined
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56 # else
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57 # define ORTHANC_ENABLE_LOGGING_STDIO 0
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58 # endif
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59 #endif
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60
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61 #if ORTHANC_ENABLE_LOGGING_PLUGIN == 1
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62 # include <orthanc/OrthancCPlugin.h>
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63 #endif
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64
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65 #include <boost/lexical_cast.hpp>
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66
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67 namespace Orthanc
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68 {
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69 namespace Logging
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70 {
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71 #if ORTHANC_ENABLE_LOGGING_PLUGIN == 1
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72 void Initialize(OrthancPluginContext* context) ORTHANC_PUBLIC;
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73 #else
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74 void Initialize() ORTHANC_PUBLIC;
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75 #endif
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76
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77 void Finalize() ORTHANC_PUBLIC;
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78
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79 void Reset() ORTHANC_PUBLIC;
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81 void Flush() ORTHANC_PUBLIC;
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83 void EnableInfoLevel(bool enabled) ORTHANC_PUBLIC;
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84
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85 void EnableTraceLevel(bool enabled) ORTHANC_PUBLIC;
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87 bool IsTraceLevelEnabled() ORTHANC_PUBLIC;
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89 bool IsInfoLevelEnabled() ORTHANC_PUBLIC;
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91 void SetTargetFile(const std::string& path) ORTHANC_PUBLIC;
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93 void SetTargetFolder(const std::string& path) ORTHANC_PUBLIC;
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95 #if ORTHANC_ENABLE_LOGGING_STDIO == 1
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96 typedef void (*LoggingFunction)(const char*);
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97 void SetErrorWarnInfoTraceLoggingFunctions(
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98 LoggingFunction errorLogFunc,
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99 LoggingFunction warningLogfunc,
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100 LoggingFunction infoLogFunc,
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101 LoggingFunction traceLogFunc);
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102 #endif
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103
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104
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105 struct NullStream : public std::ostream
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106 {
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107 NullStream() :
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108 std::ios(0),
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109 std::ostream(0)
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110 {
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111 }
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112
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113 template <typename T>
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114 std::ostream& operator<< (const T& message)
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115 {
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116 return *this;
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117 }
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118 };
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119 }
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120 }
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121
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122 #if ORTHANC_ENABLE_LOGGING != 1
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123
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124 # define LOG(level) ::Orthanc::Logging::NullStream()
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125 # define VLOG(level) ::Orthanc::Logging::NullStream()
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126
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127 #elif (ORTHANC_ENABLE_LOGGING_PLUGIN == 1 || \
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128 ORTHANC_ENABLE_LOGGING_STDIO == 1)
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129
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130 # include <boost/noncopyable.hpp>
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131 # define LOG(level) ::Orthanc::Logging::InternalLogger \
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132 (::Orthanc::Logging::InternalLevel_ ## level, __FILE__, __LINE__)
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133 # define VLOG(level) ::Orthanc::Logging::InternalLogger \
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134 (::Orthanc::Logging::InternalLevel_TRACE, __FILE__, __LINE__)
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135
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136 namespace Orthanc
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137 {
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138 namespace Logging
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139 {
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140 enum InternalLevel
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141 {
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142 InternalLevel_ERROR,
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143 InternalLevel_WARNING,
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144 InternalLevel_INFO,
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145 InternalLevel_TRACE
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146 };
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147
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148 class ORTHANC_PUBLIC InternalLogger : public boost::noncopyable
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149 {
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150 private:
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151 InternalLevel level_;
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152 std::stringstream messageStream_;
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153
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154 public:
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155 InternalLogger(InternalLevel level,
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156 const char* file,
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157 int line);
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158
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159 ~InternalLogger();
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160
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161 template <typename T>
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162 InternalLogger& operator<< (const T& message)
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163 {
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164 messageStream_ << message;
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165 return *this;
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166 }
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167 };
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168 }
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169 }
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170
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171
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172
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173
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174 #else /* ORTHANC_ENABLE_LOGGING_PLUGIN == 0 &&
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175 ORTHANC_ENABLE_LOGGING_STDIO == 0 &&
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176 ORTHANC_ENABLE_LOGGING == 1 */
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177
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178 # include <boost/thread/mutex.hpp>
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179 # define LOG(level) ::Orthanc::Logging::InternalLogger(#level, __FILE__, __LINE__)
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180 # define VLOG(level) ::Orthanc::Logging::InternalLogger("TRACE", __FILE__, __LINE__)
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181
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182 namespace Orthanc
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183 {
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184 namespace Logging
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185 {
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186 class ORTHANC_PUBLIC InternalLogger
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187 {
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188 private:
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189 boost::mutex::scoped_lock lock_;
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190 NullStream null_;
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191 std::ostream* stream_;
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192
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193 public:
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194 InternalLogger(const char* level,
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195 const char* file,
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196 int line);
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197
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198 ~InternalLogger();
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199
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200 template <typename T>
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201 std::ostream& operator<< (const T& message)
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202 {
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203 return (*stream_) << boost::lexical_cast<std::string>(message);
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204 }
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205 };
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206
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207 /**
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208 opaque pointer that represents the state of the logging configuration
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209 */
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210 typedef void* LoggingMemento;
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211
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212 /**
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213 Returns an object that contains the logging configuration.
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214
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215 This function allocates resources that you must dispose of by
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216 using either RestoreLoggingMemento or DiscardLoggingMemento.
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217
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218 This function is only to be used by tests.
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219 */
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220 LoggingMemento CreateLoggingMemento() ORTHANC_PUBLIC;
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221
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222 /**
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223 Restores the logging configuration. The logging system is restored in
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224 the state it was in when the memento object was created through
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225 GetLoggingMemento().
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226
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227 After calling this function, the memento object may not be used
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228 again
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229
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230 This function is only to be used by tests.
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231 */
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232 void RestoreLoggingMemento(LoggingMemento memento) ORTHANC_PUBLIC;
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233
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234 /**
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235 Call this function if you do not plan on restoring the logging
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236 configuration state that you captured with CreateLoggingMemento
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237
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238 This function is only to be used by tests.
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239 */
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240 void DiscardLoggingMemento(LoggingMemento memento) ORTHANC_PUBLIC;
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241
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242 /**
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243 Set custom logging streams for the error, warning and info logs.
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244 This function may not be called if a log file or folder has been
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245 set beforehand. All three pointers must be valid and cannot be NULL.
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246
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247 Please ensure the supplied streams remain alive and valid as long as
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248 logging calls are performed.
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249
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250 In order to prevent dangling pointer usage, it is recommended to call
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251 Orthanc::Logging::Reset() before the stream objects are destroyed and
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252 the pointers become invalid.
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253 */
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254 void SetErrorWarnInfoLoggingStreams(std::ostream* errorStream,
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255 std::ostream* warningStream,
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256 std::ostream* infoStream) ORTHANC_PUBLIC;
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257
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258 #ifdef __EMSCRIPTEN__
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259 /**
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260 This function will change the logging streams so that the logging functions
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261 provided by emscripten html5.h API functions are used : it will change the
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262 error_, warning_ and info_ stream objects so that their operator<< writes
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263 into the browser console using emscripten_console_error(),
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264 emscripten_console_warn() and emscripten_console_log(). This will allow for
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265 logging levels to be correctly handled by the browser when the code executes
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266 in Web Assembly
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267 */
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268 void EnableEmscriptenLogging() ORTHANC_PUBLIC;
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269 #endif
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270 }
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271 }
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272
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273 #endif // ORTHANC_ENABLE_LOGGING