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From Curt Arnold <carn...@apache.org>
Subject Re: New Appender: PatternFileAppender
Date Tue, 02 Sep 2008 21:04:30 GMT

On Sep 2, 2008, at 3:38 PM, David Britton wrote:

> Hello --
>
> I'm not sure if this is the correct way to do this, but my colleague  
> and
> I have developed a new appender called a PatternFileAppender.  I did  
> not
> see anything else like this in the log4j distribution, but it helped  
> us
> solve our particular problem, and I think it's a good general purpose
> appender.  If someone knows of another appender like this, I would  
> love
> to hear about it.
>
> I went to make an official patch for log4j 1.2, but I found that the
> code needed to be compatible with 1.2 source compatibility level.   
> Since
> the code uses generics in it's use of the LinkedHashMap data  
> structure,
> it needs 1.5 or later to compile correctly.
>
> Anyway, I've attached the file, if there is an "official" way to do
> this, please point me in the right direction.
>
> Here is the high-level details of the appender:
>
> * Can process a filename as a pattern, with all substitutions  
> available.
>  (e.g., MDC, date, variable, level, class, ...)
>
> * Interesting use cases we are using it for:
>    - Separate log file per "thread" using MDC (note that "thread"  
> could
>      be any separation desired, log level, date, time, etc).
>
> * Keeps a cache of the latest 20 open file streams, so as not to
>  overload the OS/filesytem/etc
>
> * Adds performance penalty in that each log message will generate an
>  extra pattern lookup.  Note that this already happens for the message
>  itself, so this does not seem like a huge impact.
>
>
> Let me know any feedback...  Thanks!
>
> -- 
> David Britton <dpb@hp.com>
> < 
> PatternFileAppender 
> .java 
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Could you compare it with the MultiFileAppender that has been  
languishing in the sandbox for a while?  Search the archives for  
MultiFileAppender.  Source code at http://svn.apache.org/repos/asf/logging/sandbox/log4j/multifile

.

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