Re: log4j2 2.14.0 and the mongodb4 appender

Hello Julian,

When I created the version 4 of the MongoDB appender, I realized that for
all the use cases I had and I felt were reasonable, I could use a
connection string, a bit like you can in JDBC, which I could not do with a
version 3 driver. There are two settings IIRC that I did not find mappings
in a version 4 connection string: capped and collection size.

Note that you can also parameterize the configuration with ${variables}, so
you could parameterize the user and password in a connection string, see:

-
https://logging.apache.org/log4j/2.x/manual/configuration.html#RuntimeLookup
-
https://logging.apache.org/log4j/2.x/manual/configuration.html#PropertySubstitution
-
https://logging.apache.org/log4j/2.x/manual/appenders.html#NoSQLAppenderMongoDB4

If you feel like you still need the factory method as a mechanism to create
a provider, then please feel free to provide a PR on GitHub here:
https://github.com/apache/logging-log4j2

Gary

On Mon, Nov 30, 2020 at 10:17 AM Julian Woodward <[email protected]> wrote:

> When the mongodb4 appender was created for log4j2, the ability to specify a
> factory class/method in the log4j2.xml file was removed, and the
> configuration option was instead reverted to requiring a simple connection
> string.
>
> Was there a technical reason why that needed to happen, or was it just for
> simplicity at dev time?
>
> I've been relying on the factory approach, as the database credentials are
> not known until run-time in my use-case. I was also looking forward to
> having a mongodb4 version to upgrade to, but as it stands now this is
> unfortunately not giving me what I need.
>
> Thanks!
>
> Julian Woodward
>
> PS New to this forum, so please be forgiving of any breaches of etiquette!
>