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https://issues.apache.org/jira/browse/LOG4J2-17?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867814#action_12867814
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Ralph Goers commented on LOG4J2-17:
-----------------------------------
In my experimental branch I have enhanced Filters so that they can be
configured globally as well as on a logger in addition to on an appender. The
branch contains a couple of example filters.
> Provide enhanced logger filtering support.
> ------------------------------------------
>
> Key: LOG4J2-17
> URL: https://issues.apache.org/jira/browse/LOG4J2-17
> Project: Log4j 2
> Issue Type: New Feature
> Components: Core
> Reporter: Ralph Goers
>
> We wrote our own logging framework primarily because log4j didn't provide
> some of the features we needed. Our software runs on behalf of many
> companies, products and users all in the same JVM. We have a requirement to
> be able to enable logging based on some of these factors. For example, we
> might want to enable debug logging only for a specific company or even a
> specific user. All our requests store attributes, such as the companyId,
> product name and userid in the MDC.
> So the real requirement here is to be able to filter log records early based
> on more information than just the log level. For example, our requirement
> could be met by a filter that could be configured to associate a log level
> with a company id. Then when debug is called a check would first be done to
> see if debug was enabled for that company id and then whether debug was
> enabled for that logger. These checks cannot be done as filters on Appenders
> as the performance of the system is dramatically impacted as isDebugLogging
> really needs to return false for all company ids other than the one that is
> enabled.
> This feature is similar to LogBack's TurboFilter, except I would like it
> implemented differently. I would recommend that the filter be specified
> globally but referenced on each logger to which it applies, much as the
> specification of Appenders is done.
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