Hi Norbert,
Short responses inline.
On 2/9/2022 1:46 AM, Norbert Kiesel wrote:
> Hi,
>
> we often need to change log level thresholds to investigate a problem in
> a running system. Right now, we do that by using
>
> <configuration scan="true" scanPeriod="30 seconds">
>
> and then editing the logback.xml file by hand (i.e. using a text editor
> or Sed or Perl). I wonder if there is a better way to accomplish this.
> I know that we can e.g. use
>
> <root level="${rootLevel}"/>
>
> but what I do not yet understand is:
>
> 1. Can I modify the value if this variable via some Java API from
> within my application?
Yes.
> 2. Do we still need the |scan="true"| attribute or will the
> "rootLevel" variable be evaluated every time the logger is used?
No and no.
> 3. Is there a measurable performance impact by using variables in that
> manner?
It is not possible to reevaluate ${rootLevel} at each logger call as
such a feature would have had an enormous impact on performance.
--
Ceki Gülcü
Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch
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