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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-486) RollingFile Appender - add custom info at the start of each logfile
Date Tue, 07 Jan 2014 17:17:52 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864408#comment-13864408
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Ralph Goers commented on LOG4J2-486:
------------------------------------

Joe, I'm beginning to think there is some sort of communication problem here. I mentioned
XMLLayout, etc to illustrate that we know using the header and footer works properly to do
what you are trying to accomplish, not to tell you that you should use one of those layouts.
 If you wanted to add custom info after the begin XML tag that the existing header generates
then you would want to override the XMLLayout, but you have only mentioned your desire to
use the PatternLayout so that is what I am suggesting needs to be customized to meet your
needs.  

Gary,  Being able to supply a header and footer file is a good idea, although it wouldn't
allow for dynamic content unless the data in the file is interpolated (which I think should
be done).

> RollingFile Appender - add custom info at the start of each logfile
> -------------------------------------------------------------------
>
>                 Key: LOG4J2-486
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-486
>             Project: Log4j 2
>          Issue Type: Question
>          Components: Appenders
>    Affects Versions: 2.0-beta9
>         Environment: Java 1.7, Linux
>            Reporter: Joe Merten
>         Attachments: MyRolloverStrategy.java, log4j2.xml
>
>
> I post this question here because of a hint of Remko Popma.
> See also:
> * http://apache-logging.6191.n7.nabble.com/log4j2-getting-started-amp-rolling-files-tt8406.html#a42402
> * http://stackoverflow.com/questions/20819376/log4j2-rollingfile-appender-add-custom-info-at-the-start-of-each-logfile
> I want to add some custom info at the top of each logfile, like the version string of
my application, the application uptime and the system uptime. And even writing some »bye,
bye / eof« to the bottom of the just closed logfile would also be fine.
> Because there is no appropriate hook or callback to get notified when the RollingFileAppander
is creating / has created a new file, so that I can put my things at first into these new
logfile, I tried to extend DefaultRolloverStrategy. But currently, I stuck at some points.
> Seems that I have to deal with {{@Plugin}} and {{@PluginFactory}}. My try with the attached
log4j2.xml and MyRolloverStrategy.java compiles without errors and warnings. But when I start
the application, I get this error message:
> {{2014-01-05 23:22:05,876 ERROR RollingFile contains an invalid element or attribute
"MyRolloverStrategy"}}
> And then the next step would be: "how to write to the logfiles within my rollover method?"
> log4j2.xml :
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration>
>   <Properties>
>     <Property name="projectPrefix">Tts</Property>
>     <Property name="rawPattern">%d %-5p [%t] %C{2} (%F:%L) - %m%n</Property>
>     <Property name="coloredPattern">%d %highlight{%-5p}{FATAL=bright red, ERROR=red,
WARN=yellow, INFO=cyan, DEBUG=green, TRACE=bright blue} %style{[%t] %C{2} (%F:%L) -}{bright,black}
%m%n</Property>
>     <Property name="coloredShortPattern">%d %highlight{%-5p}{FATAL=bright red,
ERROR=red, WARN=yellow, INFO=cyan, DEBUG=green, TRACE=bright blue} %style{[%t] -}{bright,black}
%m%n</Property>
>     <Property name="fileName">Log/${projectPrefix}.log</Property>
>     <Property name="filePattern">Log/${projectPrefix}-%i.log</Property>
>   </Properties>
>   <Appenders>
>     <Console name="Stdout" target="SYSTEM_OUT">
>       <PatternLayout pattern="${coloredPattern}"/>
>     </Console>
>     <RollingFile name="Logfile" fileName="${fileName}" filePattern="${filePattern}">
>       <PatternLayout pattern="${rawPattern}"/>
>       <Policies>
>         <SizeBasedTriggeringPolicy size="16 MB"/>
>       </Policies>
>       <eeo.toolbox.MyRolloverStrategy fileIndex="min" max="16"/>
>     </RollingFile>
>   </Appenders>
>   <Loggers>
>     <Root level="info">
>       <AppenderRef ref="Stdout"/>
>       <AppenderRef ref="Logfile"/>
>     </Root>
>   </Loggers>
> </Configuration>
> {code}



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