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From "Raman Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1686) Support conditional configuration
Date Mon, 14 Nov 2016 02:04:58 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15662529#comment-15662529
] 

Raman Gupta commented on LOG4J2-1686:
-------------------------------------

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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