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From Gary Gregory <garydgreg...@gmail.com>
Subject Re: Set the file name based on command line args
Date Thu, 07 Aug 2014 01:19:44 GMT
And worse: vendor specific!

Gary


On Wed, Aug 6, 2014 at 9:05 PM, Remko Popma <remko.popma@gmail.com> wrote:

> Oooh... A little naughty, but a lot of fun! :-)
> Thanks for the pointer!
>
> Sent from my iPhone
>
> > On 2014/08/07, at 9:44, Gary Gregory <garydgregory@gmail.com> wrote:
> >
> > With some debug API hackery:
> >
> http://docs.oracle.com/javase/7/docs/jdk/api/jpda/jdi/com/sun/jdi/StackFrame.html
> >
> > Gary
> >
> >
> >> On Wed, Aug 6, 2014 at 8:36 PM, Remko Popma <remko.popma@gmail.com>
> wrote:
> >>
> >> I don't follow... If you walk the stack trace you can find the name of
> the
> >> original class whose main() method was called, but how would that give
> you
> >> access to the main method's parameter values?
> >>
> >> Sent from my iPhone
> >>
> >>> On 2014/08/07, at 9:26, Gary Gregory <garydgregory@gmail.com> wrote:
> >>>
> >>> Yes you are right but the stack walker could be used even if you do not
> >> control to source for main. Maybe a script calls a main and then my app
> >> plugin gets called and I want to also follow the verbose command line
> >> setting.
> >>>
> >>>
> >>> Gary
> >>>
> >>> <div>-------- Original message --------</div><div>From:
Ralph Goers <
> >> ralph.goers@dslextreme.com> </div><div>Date:08/06/2014  19:18
> >> (GMT-05:00) </div><div>To: Log4J Users List <
> >> log4j-user@logging.apache.org> </div><div>Subject: Re: Set the
file
> name
> >> based on command line args </div><div>
> >>> </div>Wouldn’t it be easier to have a Lookup that your main called
and
> >> just passed the arguments?  But yeah, it should be possible to do what
> you
> >> are suggesting.
> >>>
> >>> Ralph
> >>>
> >>>> On Aug 6, 2014, at 4:09 PM, Gary Gregory <garydgregory@gmail.com>
> >> wrote:
> >>>>
> >>>> I wonder if we could write a "MainArgumentsLookup" that finds the main
> >>>> thread and walks up the stack to the public static main(String[]) main
> >>>> methods and gets the arguments from the stack...
> >>>>
> >>>> Gary
> >>>>
> >>>>
> >>>> On Wed, Aug 6, 2014 at 6:54 PM, Ralph Goers <
> ralph.goers@dslextreme.com
> >>>
> >>>> wrote:
> >>>>
> >>>>> Well….
> >>>>>
> >>>>> You would really be passing the name of the file to the Appender,
> not a
> >>>>> Logger.  Loggers only reference Appenders so you can’t really
> configure
> >>>>> them with Appender configuration data. That said, Log4j 2 provides
a
> >> few
> >>>>> ways you could do this:
> >>>>> 1. Set a system property and reference it via ${sys:propertyName}
in
> >> the
> >>>>> configuration.  The manual has examples of this.
> >>>>> 2. Create a custom Lookup Plugin and then register the file name
with
> >> the
> >>>>> Lookup.  Then reference it from the configuration as  ${myLookup:
> key}
> >>>>> where myLookup is the name of your custom Lookup and key is the
name
> >> that
> >>>>> represents the file name value.
> >>>>> 3. Create a custom Configuration the extends XMLConfiguration or
> >>>>> JSONConfiguration. Pass the file name to that class and have it
add
> >> that as
> >>>>> a property to the properties Map in the configuration. The XML could
> >> then
> >>>>> just reference it as ${propertyName}.
> >>>>>
> >>>>> Ralph
> >>>>>
> >>>>>> On Aug 6, 2014, at 2:03 PM, Arwen Pond <apond@book.com>
wrote:
> >>>>>>
> >>>>>> My application takes a parameter where the user can specify
the log
> >>>>> file.  I'd like to pass this parameter to the Logger which uses
a
> >>>>> FileAppender.  I am not sure how to do this in log4j 2.
> >>>>>>
> >>>>>> Thanks,
> >>>>>> Arwen
> >>>>>>
> >>>>>>
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> >>>>
> >>>>
> >>>> --
> >>>> E-Mail: garydgregory@gmail.com | ggregory@apache.org
> >>>> Java Persistence with Hibernate, Second Edition
> >>>> <http://www.manning.com/bauer3/>
> >>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
> >>>> Spring Batch in Action <http://www.manning.com/templier/>
> >>>> Blog: http://garygregory.wordpress.com
> >>>> Home: http://garygregory.com/
> >>>> Tweet! http://twitter.com/GaryGregory
> >>>
> >>>
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> >>
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> >
> >
> > --
> > E-Mail: garydgregory@gmail.com | ggregory@apache.org
> > Java Persistence with Hibernate, Second Edition
> > <http://www.manning.com/bauer3/>
> > JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
> > Spring Batch in Action <http://www.manning.com/templier/>
> > Blog: http://garygregory.wordpress.com
> > Home: http://garygregory.com/
> > Tweet! http://twitter.com/GaryGregory
>
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>
>


-- 
E-Mail: garydgregory@gmail.com | ggregory@apache.org
Java Persistence with Hibernate, Second Edition
<http://www.manning.com/bauer3/>
JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
Spring Batch in Action <http://www.manning.com/templier/>
Blog: http://garygregory.wordpress.com
Home: http://garygregory.com/
Tweet! http://twitter.com/GaryGregory

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