How is logback's “prudent mode” implemented?

Question

The prudent mode in logback serializes IO operations between all JVMs writing to the same file, potentially running on different hosts. In other logging frameworks, logging to a central TCP (or JMS) appender seems to be the only solution if output from many loggers should go to the same file.

As I am using a Delphi library which is based on log4j and also can not log to the same file from different instances of the same applications (on a terminal server), it would be interesting to know how this feature is implemented. - ps I'll check the logback source code and come back to answer my question if nobody is faster :)

Answer 1

It's implemented with a simple FileLock . You can check in the source of FileAppender .