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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] Created: (LOG4J2-17) Provide enhanced logger filtering support.
Date Sun, 22 Jun 2008 22:39:45 GMT
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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