Re: [log4perl-devel] Generic message addition?

[Mike S. <m...@pe...>]

On Tue, 9 Aug 2011, Holger Jahn wrote:

> Now, we would like to add some generic info to all of the logged
> messages (OS name & version, for instance). Is there a way of telling
> Log4perl to do this, i.e. without having to add this info manually to
> all of the existing places where we currently log stuff?

Hi Holger,

absolutely, that's exactly what the so-called Mapped Diagnostic Context
in Log4perl is for. As explained here:

     http://search.cpan.org/~mschilli/Log-Log4perl-1.33/lib/Log/Log4perl.pm#Mapped_Diagnostic_Context_%28MDC%29

your application can set certain values via MDC and your Log4perl layout
can be configured to display the set value via the %X{name} placeholder
in all your messages, without the need to touch the code of the
application.

Hope that helps.

-- -- Mike

Mike Schilli
m...@pe...