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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: log4j: dump wrap-around buffer of all log messages
Date Mon, 11 Aug 2003 13:28:38 GMT

Howdy,
I would really want this sort of feature benchmarked for memory use ;)  Perhaps this is one
of the reasons log4j has better performance than your current java trace kit ;)

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Ceki Gülcü [mailto:ceki@qos.ch]
>Sent: Monday, August 11, 2003 9:24 AM
>To: Log4J Users List
>Subject: Re: log4j: dump wrap-around buffer of all log messages
>
>
>Yes, this is certainly possible. The SMTPAppender works in a similar
>fashion.
>
>At 03:09 PM 8/11/2003 +0200, you wrote:
>>Dear log4j users,
>>
>>
>>Currently I'm evaluating log4j 1.2.8 to replace an other Java Trace
>package
>>(see http://visibleworkings.com/trace/) in our applications. Log4j's big
>>advantage is its performance, but still I'm missing a feature that is
>>present in the Java Trace package: the ability to dump a wrap-around
>buffer
>>of, let's say, the last 500 log messages in the log file.
>>
>>The wrap-around buffer (think of it as an array of let's say 500 log
>>messages) contains at any moment, the last 500 log messages. The idea is
>>that the logger has 2 log levels: one which determines what level is
>present
>>in the log file (or std out or whatever), another which determines at what
>>level the internal wrap-around buffer is filled with messages. This way,
>it
>>is possible to let your application log at level INFO, while the internal
>>buffer keeps all messages of level DEBUG or higher. When an exception is
>>thrown, the user should have the ability to request a dump of the buffer,
>>such that the more detailed DEBUG messages are also present in the log
>file
>>to make debugging more easy.
>>
>>Is this possible in log4j? If not, has anyone a workaround for this or
>>should I ask for a feature request?
>>
>>
>>Kind regards,
>>Patrick Hancke
>>Siemens Atea IC D BS PD2
>>tel ++32(0)14 - 25 24 27
>>fax ++32(0)14 - 25 30 25
>>
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>
>--
>Ceki For log4j documentation consider "The complete log4j manual"
>      ISBN: 2970036908 http://www.qos.ch/shop/products/clm_t.jsp
>
>
>
>
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