Re: Reusing a PatternLayout pattern across several config files

 Thank you, did not know about RoutingAppender. Will definitely look into
that. Good to know that wrapping like this is a known pattern.

On 2020/11/20 14:15:53, Matt Sicker <[email protected]> wrote:
> That plug-in wrapper pattern will always work. Maybe creating properties
to>
> reference as variables is an option? There might be a way to structure
your>
> configuration to use routing appenders or something like that to
minimize>
> duplication, too.>
>
> On Fri, Nov 20, 2020 at 05:07 Stig Rohde Døssing <[email protected]>>
> wrote:>
>
> > Hi,>
> >>
> > I have an application that ships with a number of config files
included. We>
> > have a PatternLayout pattern that is used across all configurations,
since>
> > our application needs to parse logs from that certain logs. We
currently>
> > copy-paste the pattern to each file.>
> >>
> > I took a look at using properties and XInclude to avoid repeating the>
> > pattern, but this doesn't work too well with log4j2-test.xml, since
that>
> > file is not located in the same directory as the production log4j2.xml>
> > files. I would also like to make it easy for customers doing their own>
> > custom log configs to reference the pattern, and it would be nice if
they>
> > could just refer to the pattern by name.>
> >>
> > A bit of a hack I came up with was to programmatically create a named>
> > PatternLayout by using the PluginFactory mechanism>
> >>
> > @Plugin(name = "MyPatternLayout", category = Node.CATEGORY, elementType
=>
> > Layout.ELEMENT_TYPE, printObject = true)>
> > class MyPatternLayout {>
> >   @PluginFactory>
> >   public static PatternLayout createLayout() {>
> >     PatternLayout.builder.withPattern(myPattern).build()>
> >   }>
> > }>
> >>
> > This lets me refer to MyPatternLayout rather than including the pattern
in>
> > the config files.>
> >>
> > Is this a reasonable way to accomplish reuse, or am I misusing the
factory>
> > mechanism in a way that is likely to break in future releases?>
> >>
>