My first reaction is to say stop using isDebugEnabled(). You shouldn't need to 
do that. 

But if you really must, then try using  isDebugEnabled(Marker) with 
debug(Marker,...). 

Hope this helps,
Paul

> On Jul 26, 2015, at 09:00, Robert Krüger <[email protected]> wrote:
> 
> This must be a simple thing, but I am not getting it.
> 
> I have a marker, say "performance" that I use when logging. Also, I often use 
> isDebugEnabled() etc. when log messages become expensive to build.
> 
> Now I want to configure logback that I can do these two things:
> 
> 1) Log all statements in Logger foo.Bar that are debug or higher and use the 
> marker "performance"
> 
> 2) Log all statements across all Loggers that use the marker "performance"
> 
> To achieve 1) I tried this:
> 
> <turboFilter class="ch.qos.logback.classic.turbo.MarkerFilter">
>   <Marker>index-control-flow</Marker>
>   <OnMatch>ACCEPT</OnMatch>
> </turboFilter>
> 
> <logger name="foo.Bar" level="DEBUG"/>
> Then also all log messages that are not tagged with this marker appear in the 
> log.
> 
> To achieve 2) I tried omitting the logger line above and got only log 
> messages with the marker, however, all log messages protected by a check of 
> isDebugEnabled() are omitted.
> 
> I must be missing a general concept here.
> 
> Thanks in advance,
> 
> Robert
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