[logback-user] Conditional RollingFileAppender or Sifter?

Sean Crotty scrotty at gmail.com
Sat May 22 00:26:18 CEST 2010

Can I configure a RollingAppender/Sifter to NOT keep a file if a certain
condition is not met? For example, I don't want to save rolled files that
don't have at least one logged statement of WARN level or higher.


Here is my use case: have a sifter that creates multiple files - one per
transaction. There are thousands of transactions in my system. I only want a
transaction log file saved if there is something interesting about that
particular transaction. For me, "interesting" is a WARN or ERROR statement
in the log file.


I don't know if this would be part of the RollingFileAppender or maybe
something done when the sifter times out.


Any advice?




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