[jira] [Comment Edited] (LOG4J2-486) RollingFile Appender - add custom info at the start of each logfile

["Ralph Goers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863063#comment-13863063 ] 

Ralph Goers edited comment on LOG4J2-486 at 1/6/14 4:09 PM:
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Actually, to add something to the file when it is created you do not need to create a custom appender. Instead, you need to extend PatternLayout and call the setHeader method in the constructor with whatever you want logged in the header.  OutputStreamManager caches the header so it currently can't be changed dynamically with every file.  If this is required then we should change this issue to be a bug against that.


was (Author: ralph.goers@dslextreme.com):
Actually, to add something to the file when it is created you do not need to create a custom appender. Instead, you need to extend PatternLayout and call the setHeader method in the constructor with whatever you want logged in the header.  Alternatively, you can override the getHeader method if you need something that changes with every new file.

> 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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