Re: [logback-user] Can an appender pattern be varied based on MDC?

24 Jun 2022

      Hi Mark,

You can create your own conversion specifier. Here is how:

https://logback.qos.ch/manual/layouts.html#customConversionSpecifier

Best regards,

-- 
Ceki Gülcü

Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch

On 6/24/2022 10:07 PM, Mark Raynsford wrote:
...
Hello!
I have an application where parts of the application set a "domain"
MDC value where appropriate, and unset it later when it's no longer
applicable.
I'd like to use something like the following when "domain" is set:
<appender name="STDERR"
            class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%level %logger [%X{domain}] %msg%n</pattern>
    </encoder>
  </appender>
... and something like the following when "domain" _isn't_ set:
<appender name="STDERR"
            class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%level %logger %msg%n</pattern>
    </encoder>
  </appender>
Is this possible? I'm not seeing anything in the manual that would
suggest it is.