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 <[EMAIL PROTECTED]>
<
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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