On 2024-04-17 8:51 a.m., Ceki Gulcu via logback-user wrote:
On 4/16/2024 3:59 PM, Paul Galbraith via logback-user wrote:
Is it possible to write your own custom MDC implementation (similar to
log4j's ContextDataProvider) so that logback can get context details
from something other than threadlocal storage?
Hi Paul,
This is a recurrent request and in more recent versions of logback you
may override the MDC implementation.
To do this, you need
1) to set the custom mdcAppender in your own implementation of
SLF4JServiceProvider
and
2) by calling the setMdcAdapter() method of the loggerContext instance
currently in use. Calling LoggerFactory.getILoggerFactory will return
this instance. You probably have a handle on the loggerContext in your
own implementation of SLF4JServiceProvider as mentioned in the previous
point.
An alternative under consideration, but not yet implemented, is to
provide an extension point in SLF4J's mdcAdapter interface itself.
There is a request in the SLF4J project (on github) where this is being
discussed. You are welcome to add your voice. Here is the link
https://github.com/qos-ch/slf4j/issues/399
Let us know how it goes,
Thanks Ceki, in this issue #399 it sounds like proposal #2 is in line
with the approach that log4j has taken with it's ContextDataProvider
interface which can be implemented and integrated via service discovery.
I think this (proposal #2) would solve my problem nicely. I am trying
to find a way to log scoped context from reactive frameworks like vert.x
and Project Reactor where, similarly, request processing context is not
at all framed by a time window on a single thread. I'm also not looking
for any help from logback in identifying and propagating context, I just
want a hook where I can do this myself. Probably context
implementations for vert.x and Project Reactor could live nicely in a
community extension repo of some sort.
In the meantime I'll take a look at implementing SLF4JServiceProvider.
Thanks for pointing me in the right direction.
Paul
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