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annotate OrthancFramework/Sources/Logging.h @ 4119:bf7b9edf6b81 framework-lgpl

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re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 07 Jul 2020 19:17:56 +0200
parents d25f4c0fa160
children 0ae2ca210077
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
1900
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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 Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #pragma once
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24
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25 // To have ORTHANC_ENABLE_LOGGING defined if using the shared library
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26 #include "OrthancFramework.h"
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27
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28 #include <iostream>
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29
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30 #if !defined(ORTHANC_ENABLE_LOGGING)
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31 # error The macro ORTHANC_ENABLE_LOGGING must be defined
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32 #endif
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33
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34 #if !defined(ORTHANC_ENABLE_LOGGING_STDIO)
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35 # if ORTHANC_ENABLE_LOGGING == 1
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36 # error The macro ORTHANC_ENABLE_LOGGING_STDIO must be defined
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37 # else
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38 # define ORTHANC_ENABLE_LOGGING_STDIO 0
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39 # endif
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40 #endif
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41
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42
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43 namespace Orthanc
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44 {
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45 namespace Logging
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46 {
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47 enum LogLevel
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48 {
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49 LogLevel_ERROR,
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50 LogLevel_WARNING,
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51 LogLevel_INFO,
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52 LogLevel_TRACE
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53 };
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54
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55 ORTHANC_PUBLIC const char* EnumerationToString(LogLevel level);
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56
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57 ORTHANC_PUBLIC LogLevel StringToLogLevel(const char* level);
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58
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59 // "pluginContext" must be of type "OrthancPluginContext"
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60 ORTHANC_PUBLIC void InitializePluginContext(void* pluginContext);
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61
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62 ORTHANC_PUBLIC void Initialize();
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63
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64 ORTHANC_PUBLIC void Finalize();
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65
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66 ORTHANC_PUBLIC void Reset();
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67
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68 ORTHANC_PUBLIC void Flush();
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69
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70 ORTHANC_PUBLIC void EnableInfoLevel(bool enabled);
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71
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72 ORTHANC_PUBLIC void EnableTraceLevel(bool enabled);
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73
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74 ORTHANC_PUBLIC bool IsTraceLevelEnabled();
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75
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76 ORTHANC_PUBLIC bool IsInfoLevelEnabled();
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77
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78 ORTHANC_PUBLIC void SetTargetFile(const std::string& path);
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79
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80 ORTHANC_PUBLIC void SetTargetFolder(const std::string& path);
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81
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82 struct NullStream : public std::ostream
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83 {
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84 NullStream() :
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85 std::ios(0),
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86 std::ostream(0)
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87 {
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88 }
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89
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90 template <typename T>
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91 std::ostream& operator<< (const T& message)
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92 {
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93 return *this;
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94 }
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95 };
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96 }
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97 }
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98
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99
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100 #if ORTHANC_ENABLE_LOGGING != 1
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101 # define LOG(level) ::Orthanc::Logging::NullStream()
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102 # define VLOG(level) ::Orthanc::Logging::NullStream()
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103 #else /* ORTHANC_ENABLE_LOGGING == 1 */
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104 # define LOG(level) ::Orthanc::Logging::InternalLogger \
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105 (::Orthanc::Logging::LogLevel_ ## level, __FILE__, __LINE__)
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106 # define VLOG(level) ::Orthanc::Logging::InternalLogger \
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107 (::Orthanc::Logging::LogLevel_TRACE, __FILE__, __LINE__)
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108 #endif
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109
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110
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111
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112 #if (ORTHANC_ENABLE_LOGGING == 1 && \
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113 ORTHANC_ENABLE_LOGGING_STDIO == 1)
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114 // This is notably for WebAssembly
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115
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116 #include <boost/lexical_cast.hpp>
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117 #include <boost/noncopyable.hpp>
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118 #include <sstream>
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119
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120 namespace Orthanc
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121 {
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122 namespace Logging
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123 {
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124 class ORTHANC_PUBLIC InternalLogger : public boost::noncopyable
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125 {
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126 private:
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127 LogLevel level_;
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128 std::stringstream messageStream_;
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129
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130 public:
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131 InternalLogger(LogLevel level,
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132 const char* file /* ignored */,
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133 int line /* ignored */) :
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134 level_(level)
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135 {
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136 }
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137
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138 ~InternalLogger();
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139
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140 template <typename T>
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141 std::ostream& operator<< (const T& message)
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142 {
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143 return messageStream_ << boost::lexical_cast<std::string>(message);
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144 }
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145 };
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146 }
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147 }
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148
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149 #endif
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150
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151
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152
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153 #if (ORTHANC_ENABLE_LOGGING == 1 && \
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154 ORTHANC_ENABLE_LOGGING_STDIO == 0)
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155
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156 #include "Compatibility.h" // For std::unique_ptr<>
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157
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158 #include <boost/lexical_cast.hpp>
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159 #include <boost/noncopyable.hpp>
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160 #include <boost/thread/mutex.hpp>
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161 #include <sstream>
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162
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163 namespace Orthanc
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164 {
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165 namespace Logging
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166 {
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167 class ORTHANC_PUBLIC InternalLogger : public boost::noncopyable
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168 {
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169 private:
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170 boost::mutex::scoped_lock lock_;
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171 LogLevel level_;
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172 std::unique_ptr<std::stringstream> pluginStream_;
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173 std::ostream* stream_;
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174
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175 public:
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176 InternalLogger(LogLevel level,
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177 const char* file,
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178 int line);
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179
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180 ~InternalLogger();
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181
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182 template <typename T>
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183 std::ostream& operator<< (const T& message)
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184 {
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185 return (*stream_) << boost::lexical_cast<std::string>(message);
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186 }
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187 };
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190 /**
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191 * Set custom logging streams for the error, warning and info
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192 * logs. This function may not be called if a log file or folder
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193 * has been set beforehand. All three references must be valid.
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194 *
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195 * Please ensure the supplied streams remain alive and valid as
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196 * long as logging calls are performed. In order to prevent
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197 * dangling pointer usage, it is mandatory to call
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198 * Orthanc::Logging::Reset() before the stream objects are
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199 * destroyed and the references become invalid.
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200 *
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201 * This function must only be used by unit tests. It is ignored if
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202 * InitializePluginContext() was called.
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203 **/
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204 ORTHANC_PUBLIC void SetErrorWarnInfoLoggingStreams(std::ostream& errorStream,
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205 std::ostream& warningStream,
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206 std::ostream& infoStream);
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207 }
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208 }
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209
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210 #endif