How to create customized filter

[cuichenli]

We intend to apply a filter to the log messages based on specific MDC attribute values. However, it seems that there is currently no existing filter for this purpose in the code base. Consequently, I would like to inquire whether users have the ability to create their own filter to accomplish this task. Thanks!

[jamezp]

Yes, users can create their own filters. Are you using the log manager in a standalone application or is it being used in something like WildFly or Quarkus?

[cuichenli]

We are using it with Quarkus. Could you please provide examples of how to create custom filters and incorporate them into the configuration file? Thank you!

[cuichenli]

Shame on me, I realized the example is available in the Quarkus's documents. However, upon examining the example and reviewing the source code, I observed that the ConsoleHandler (presumably the default handler) does not copy the MDC information. In light of this, I would like to confirm if it is secure to retrieve the MDC values in those filters. Thank you.

[jamezp]

I'm not sure why the ConsoleHandler would need to copy the MDC information. It should be running in the same thread so there shouldn't be anything to copy.

[cuichenli]

thanks!