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Posted to log4j-dev@logging.apache.org by "Kamal Mettananda (JIRA)" <ji...@apache.org> on 2016/04/21 10:10:25 UTC
[jira] [Commented] (LOG4J2-621) Pattern To Drop First X Package
Parts
[ https://issues.apache.org/jira/browse/LOG4J2-621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251527#comment-15251527 ]
Kamal Mettananda commented on LOG4J2-621:
-----------------------------------------
Hi all
I looked at this request which seems to be a very useful feature IMHO, specially given that it provides a way to remove the first known packages list from the Logger name or caller's name in [Patter Layout|http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout].
It seems we can implement this change by supporting a negative integer in the precision section of the following pattern configurations.
* c\{precision}
* logger\{precision}
* C{precision}
* class{precision}
> Pattern To Drop First X Package Parts
> -------------------------------------
>
> Key: LOG4J2-621
> URL: https://issues.apache.org/jira/browse/LOG4J2-621
> Project: Log4j 2
> Issue Type: Wish
> Components: Layouts
> Affects Versions: 2.0-rc1
> Reporter: Lee Theobald
> Priority: Trivial
>
> Currently you can have a pattern that will print out the last X parts of you package. So if my package was {{uk.co.ltheobald.foo.bar}}, then using {{%logger\{2\}}} will print {{foo.bar}}. But when I have a number of different package levels, this becomes less useful (in my opinion).
> What I'd find more useful is the inverse where I can ditch the first X parts. Something like {{%logger\{-3\}}} for example. That way I'd end up with:
> {{uk.co.ltheobald.Main logging}} as {{Main}}
> {{uk.co.ltheobald.foo.MyClass}} logging as {{foo.MyClass}}
> {{uk.co.ltheobald.foo.bar.MyOtherClass}} logging as {{foo.bar.MyOtherClass}}
> Removing from the start of the logger name allows me to consistently trim off package names that I know are always the same. I'll see if I can produce a code example for this if I get time but I wanted to log it in the meanwhile.
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