DO NOT REPLY [Bug 15450] New: - Ability to set levels for loggers

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=15450

Ability to set levels for loggers

           Summary: Ability to set levels for loggers
           Product: Commons
           Version: 1.0 Beta 1
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Logging
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: hlship@attbi.com


Something I missed when I converted from Log4J to jakarta-logging was the 
ability to set levels for my loggers dynamically.

Part of Tapestry is the Inspector, a component/mini-application that embeds 
into an application.  It used to have a form that listed all Log4J categories 
(now called "Loggers") and you could set the Priority (now "Level") for each 
(as well as create new loggers on the fly).

I had to strip that functionality out which is unhappy, since it was very 
useful for enabling debug output just as you need it.

Anyway, extending the LogFactory or Log interfaces with
a) Method for obtaining sorted list of levels, as strings
b) Method for querying level for Log
c) Method for updating level for log

Would be cool and useful.

I would suggest that the levels exposed to the user code be strings, with an 
internal translation to appropriate object types.  null for no-explicit level 
(logger inherits from parent).

What's very important is the sort order, when the list of possible settings is 
provided.  I suggest a sort order of least-to-most, 
i.e., "NEVER", "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "ALL" would map to 
Log4J's default list.

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