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From "Casul User (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4NET-368) PatternString "properties" in config file
Date Tue, 22 Jan 2013 09:40:12 GMT
Casul User created LOG4NET-368:

             Summary: PatternString "properties" in config file
                 Key: LOG4NET-368
                 URL: https://issues.apache.org/jira/browse/LOG4NET-368
             Project: Log4net
          Issue Type: Improvement
          Components: Other
            Reporter: Casul User
            Priority: Minor

The PatternString has many built-in conversion patterns but none of them can use properties
defined in the configuration file. The PatternString should also help to prevent copy paste
errors and use the DRY pattern also in the config file. If you have many log files and they
log in the same path, you would like to define the log path only once. If you want to change
the log path, you would like to change it only in one place and not in many places.
Perhaps the most interesting converter is the "property" converter but you can't define global
properties in the configuration file. The log4net global properties are nice but they are
embedded in code and compiled with the application.

My suggestions are: Define log4net global properties in the configuration file:
  <add key="logpath" value="c:\logs\myapplication\" />
  <file value="%properties{logpath}log.txt" />

Or add an appsettings converter to the PatternString:
 <add key="logpath" value="c:\logs\myapplication\" />
  <file value="%appsettings{logpath}log.txt" />

There are also other cases where configuring part of the log path globally is useful, most
of the time you have different environments: test, staging, production, demo, etc. and some
times you have different type of the same environment: test-configuration1, test-configuration2,
etc. So the ability to build the log file path from properties defined in the config file
is an added value in those cases.
In those cases I have to set the properties only once in one place and I haven't to change
the log file path of every logger, this would prevent errors like logger logging in the wrong
place and it would simplify the deploy and configuration process.

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