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https://issues.apache.org/jira/browse/LOG4J2-621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251527#comment-15251527
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Kamal Mettananda edited comment on LOG4J2-621 at 4/21/16 8:16 AM:
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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}
So the sample configurations after this feature addition would look like below.
*Logger name:* org.apache.logging.log4j.core.pattern.LoggerName
*Caller's name:* org.apache.logging.log4j.core.pattern.CallerClass
*Log message:* This is a test message.
||Configuration || Output ||
| %c{-1} %m| apache.logging.log4j.core.pattern.LoggerName This is a test
message.|
| %c{-3} %m| log4j.core.pattern.LoggerName This is a test message.|
| %c{-20} %m| org.apache.logging.log4j.core.pattern.LoggerName This is a test
message.|
| %logger{-1} %m| apache.logging.log4j.core.pattern.LoggerName This is a test
message.|
| %C{-1} %m| apache.logging.log4j.core.pattern.CallerClass This is a test
message.|
| %C{-3} %m| log4j.core.pattern.CallerClass This is a test message.|
| %C{-20} %m| org.apache.logging.log4j.core.pattern.CallerClass This is a test
message.|
| %class{-1} %m| apache.logging.log4j.core.pattern.CallerClass This is a test
message.|
was (Author: lkamal):
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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