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tools:logger:start

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tools:logger:start [2020/11/26 13:00] – [Logging] ursgraftools:logger:start [2020/11/26 13:06] (current) – [Default LogWriter] ursgraf
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 While declaring a logger you can choose a category for it which is a single capital letter, see below: While declaring a logger you can choose a category for it which is a single capital letter, see below:
 <code cpp> <code cpp>
-  Logger log1();      // no category +  Logger log1 = Logger::getLogger();      // no category 
-  Logger log2('A');   // category 'A', log messages will show an 'A'+  Logger log2 = Logger::getLogger('A');   // category 'A', log messages will show an 'A'
 </code> </code>
  
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   * ERROR   * ERROR
   * FATAL: highest level   * FATAL: highest level
-Every ''LogWriter'' can be configured to pass only log messages which have a minimum severity level. This is accomplished with+Every ''Logger'' can be configured to pass only log messages which have a minimum severity level. This is accomplished with
 <code cpp> <code cpp>
-  StreamLogWriter w(std::cout); +  log.show(LogLevel::WARN);
-  w.show(LogLevel::WARN);+
 </code> </code>
 This would enable levels WARN, ERROR and FATAL. \\ This would enable levels WARN, ERROR and FATAL. \\
-If you do not specify a certain level the default level is INFO. If you want to see all messages you have to use ''show(LogLevel::TRACE)''.+If you do not specify a certain level the default level is INFO. If you want to see all messages you have to use ''show(LogLevel::TRACE)'' or use the default ''show()'' which is also ''LogLevel::TRACE''.
  
 ===== Default LogWriter ===== ===== Default LogWriter =====
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 <code cpp> <code cpp>
-  StreamLogWriter w(std::cout); +  Logger::setDefaultStreamLogger(std::cout); 
-  Logger::setDefaultWriter(&w); +  Logger log = Logger::getLogger();  // this logger will output onto the default ''LogWriter''.
-  Logger log;  // this logger will output onto the default ''LogWriter''.+
 </code> </code>
 If you forget to assign a default logger, you will not get logging information from components of the library such as the safety system or the executor. If you forget to assign a default logger, you will not get logging information from components of the library such as the safety system or the executor.
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 Sometimes it can be desirable to have a logger write to the console and write the same content into a file. This is especially helpful on a embedded system where you start an application remotely (e.g. through //ssh//). In such a case you can define a ''StreamLogWriter'' as follows:  Sometimes it can be desirable to have a logger write to the console and write the same content into a file. This is especially helpful on a embedded system where you start an application remotely (e.g. through //ssh//). In such a case you can define a ''StreamLogWriter'' as follows: 
 <code cpp> <code cpp>
-  StreamLogWriter w(std::cout, "/tmp/log");+  Logger::setDefaultStreamLogger(std::cout, "/tmp/log");
 </code> </code>
-A lop file will be created at the given location. Its file name will be appended with the current date and time of the creation of the file. That is the creation of the ''StreamLogWriter'' object.+A log file will be created at the given location. Its file name will be appended with the current date and time of the creation of the file.
tools/logger/start.1606392030.txt.gz · Last modified: 2020/11/26 13:00 by ursgraf