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From Ceki Gülcü <c...@qos.ch>
Subject Re: log4j: dump wrap-around buffer of all log messages
Date Mon, 11 Aug 2003 13:23:40 GMT

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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