Re: Question on accessing the threadcontext in pattern vs lookup

AFAIC, your reasoning on why m:testkey not working is correct. Why don't
you create your own PatternConverter rather than using a custom lookup?

Additionally, if your log sink accepts JSON, you can introduce a custom
resolver to JsonTemplateLayout too -- though note that this feature will be
available with the upcoming 2.5.0 release.

On Fri, 9 Apr 2021, 18:01 Lars-Fredrik Smedberg <[email protected]> wrote:

> Hi!
>
> We are using different appenders with a pattern layout that both read
> values from ThreadContext using %X and through a custom lookup that
> internally access the ThreadContext
>
> If we use a pattern such as "%X{testkey} $${m:testkey} %m" (the lookup
> assigned to prefix m access the same key from the ThreadContext) and then
> use our appender in an AsyncLogger then we get the correct value for the
> %X{testkey} but not for $${m:testkey}.
>
> I assume the message is formatted on the caller thread but that the lookup
> part of the pattern is resolved on the async thread since it does not seem
> to find the key in the ThreadContext inside our lookup class?
>
> Is the above the root cause to our problem? Is there a way around this? We
> really would like to use our custom lookup that use ThreadContext with
> async loggers.
>
> Any help would be greatly apreciated
> Best regards
> LF
>
> --
> Med vänlig hälsning / Best regards
>
> Lars-Fredrik Smedberg
>
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