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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 00:26:55 GMT
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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> 
> 
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