[GitHub] [logging-log4j2] ppkarwasz commented on issue #1285: Identifiers, names, refs, nightmare docs, logging hell level 999

["ppkarwasz (via GitHub)" <gi...@apache.org>]

ppkarwasz commented on issue #1285:
URL: https://github.com/apache/logging-log4j2/issues/1285#issuecomment-1442170110

   @robozb,
   
   The identifiers in the properties format are almost useless. One of the last attempts to make the properties format more digestible (#733 and related issues) proposed to use them as default appender names, but the feature never made it out to the main code.
   
   Such a usage would be in line with what Log4j 1.x did, but is not coherent with other formats: most formats use the identifiers/keys/element names to indicate the plugin type. You can see it in Ralph's YAML example:
   
   ```lang-yaml
    appenders:
      Console:
        name: STDOUT
        PatternLayout:
          Pattern: "%m%n"
       File:
         name: FILE
         fileName: ${filename}
         bufferedIO: false
         PatternLayout:
           Pattern: "%d %p %C{1.} [%t] %m%n"
   ```
   
   The keys `Console`, `File` and `PatternLayout` associated to YAML objects are used as _default_ values for the missing `type` properties.
   
   We could probably implement something similar in the properties format:
   
   ```
   appender.Console.name = STDOUT
   appender.Console.PatternLayout.pattern = "%m%n"
   
   appender.File.name = FILE
   appender.File.fileName = ${filename}
   appender.File.bufferedIO = false
   appender.File.PatternLayout.pattern = %d %p %C{1.} [%t] %m%n
   ```
   
   However there isn't much to be done if multiple appenders of the same type are required. In the YAML format we currently support the following shorthand:
   
   ```lang-yaml
   Appenders:
     File:
       - name: FILE1
         fileName: file1.log
       - name: FILE2
         fileName: file2.log
   ```
   
   (i.e. for YAML arrays the default type is the key associated to the array). I don't think anything similar would be possible for the properties format.


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