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Posted to log4j-dev@logging.apache.org by bu...@apache.org on 2007/01/28 11:55:32 UTC

DO NOT REPLY [Bug 41483] New: - PropertyFilter is not a filter, MapFilter not a filter

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           Summary: PropertyFilter is not a filter, MapFilter not a filter
           Product: Log4j
           Version: 1.3alpha
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Other
        AssignedTo: log4j-dev@logging.apache.org
        ReportedBy: genman@noderunner.net


PropertyFilter adds properties to an existing event.  Same with MapFilter. 
These are "transformers" or something like that.

How does one filter out log events with properties, e.g. MDC values?

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DO NOT REPLY [Bug 41483] - PropertyFilter is not a filter, MapFilter not a filter

Posted by bu...@apache.org.
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------- Additional Comments From sdeboy@iname.com  2007-08-10 22:03 -------
Great stuff! thanks Curt

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DO NOT REPLY [Bug 41483] - PropertyFilter is not a filter, MapFilter not a filter

Posted by bu...@apache.org.
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------- Additional Comments From sdeboy@iname.com  2007-08-10 09:02 -------
Actually, log4j1.2 does have this issue - locationInfo.

If you have multiple appenders handling an event, where the 1st appender does
not specify locationinfo=true, but the 2nd does, the 1st appender will see an
event without location info, but subsequent appenders will have location info.


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DO NOT REPLY [Bug 41483] - PropertyFilter is not a filter, MapFilter not a filter

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------- Additional Comments From carnold@apache.org  2007-08-10 21:15 -------
Added RewriteAppender and corresponding policies to the receivers companion to replace the MapFilter et 
al functionality in rev 564831.  Requires LoggingEvent.getLogger() which was added to log4j 1.2 in rev 
564830.  Could not be in extras since it depends on LoggingEvent methods that are not in pre 1.2.15 
versions.

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DO NOT REPLY [Bug 41483] - PropertyFilter is not a filter, MapFilter not a filter

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carnold@apache.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED




------- Additional Comments From carnold@apache.org  2007-08-10 08:06 -------
I also would not be surprised if these "Filters" might not also carry over their modifications into unrelated 
appenders.  For example, if you attached a filter to an appender attached to a specific logger, then the 
modification might be seen by an unrelated appender attached to the root logger.

log4j 1.2 did not provide the methods that allowed mutation on LoggingEvents so these "filters" were not 
backported to the extras companion.  Maybe the functional equivalent delegating appenders could be 
added to "extras".

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DO NOT REPLY [Bug 41483] - PropertyFilter is not a filter, MapFilter not a filter

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------- Additional Comments From sdeboy@iname.com  2007-08-09 23:24 -------
You're right, PropertyFilter, ReflectionFilter and MapFilter MODIFY logging
events (message and properties).  It might make sense to rewrite them as
appenders that delegate to another appender instead.

BTW, to filter out log events with MDC values, you could use ExpressionFilter. 

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DO NOT REPLY [Bug 41483] - PropertyFilter is not a filter, MapFilter not a filter

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carnold@apache.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED




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