Ceki Gulcu wrote:
You can pass data to your custom appender via two SLF4J primitives.
1) via MDC
[...]
2) via Parameters to the printing methods of a logger
[...]
I was going to pick option 2, but just realized that there is no API in slf4j Logger to have both the parameters for formatted message AND a Throwable. I can also see that this has been an ongoing debate, therefore I believe that my use case would provide an argument for those pushing to get that API. Mel T. wrote:
Hi,
We have an in-house logger that we want to get rid of. This logger has application specific functionality.
- We store logs in a database table
- We have specific columns that put some very-frequently used context information
- For that purpose, our logger has methods like this: log(String message, String someContextID1, String someContextID2, ...);
- This is added to the DB with specific columns for someContextID1, someContextID2, etc...
- We have a log viewer that allows to select logs based on that context information.
So we need an appender that will continue to fill up that same table.
If we move to a logger like logback, I am unsure how to best handle our application need.
This first comes to mind:
- Create our own facade that adds the specific log methods (like above) - This facade assembles these arguments into a parsable message given to sfl4j/logback - An in-house DBAppender can parse the message to extract the arguments and store them in the right column.
Or is there a more natural way to do that?
I looked at markers, MDC, but is is not clear to me if any of them would be good for that. Maybe MDC could be used that way:
- Create our own facade that adds the specific log methods (like above) - This facade assembles these arguments and places them in MDC - An in-house DBAppender can read the MDC and store values in the right column.
Also, is'nt adding another facade on top of SLF4J/logback a little too much? Since we may add out own facade, should'nt we directly use logback?
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