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https://issues.apache.org/jira/browse/LOG4J2-1686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15662529#comment-15662529
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Raman Gupta commented on LOG4J2-1686:
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That *seems* promising, but perhaps the docs need some improvement. For
example, the example references an element `PatternMatch` that, as far as I can
tell, has no corresponding documentation at all (a search on the page shows
nothing except the two usages in the example). I can *guess* that it is
creating a `PatternLayout`, keyed on the result of the referenced script, but
without looking at the source I can't really be sure.
In addition, is the only capability of a script to feed to `PatternMatch`
elements i.e. select patterns conditionally?
Conditional support in logback allows any configuration element to be made
conditional -- if scripting in log4j2 works the way I'm guessing, that means
that there has to be a corresponding `Match` element to every element that
needs to be made conditional. That isn't a very general or elegant solution.
> Support conditional configuration
> ---------------------------------
>
> Key: LOG4J2-1686
> URL: https://issues.apache.org/jira/browse/LOG4J2-1686
> Project: Log4j 2
> Issue Type: New Feature
> Components: Configurators
> Affects Versions: 2.7
> Reporter: Raman Gupta
> Priority: Blocker
>
> It would be great to support conditional configuration like logback:
> http://logback.qos.ch/manual/configuration.html#conditional
> This allows for more advanced configuration than is currently possible with
> property substitution.
> Example use case: to implement
> https://issues.apache.org/jira/browse/LOG4J2-1685 without log4j library
> support.
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