Log4j. Worker threads logging to seperate files

Hi folks,

I've a multi-threaded batch process that uses a number of worker threads. Is there anyway to setup Log4j so that every time a worker is given
a unit of work to do that it can log to a different file using some information about the unit of work. Basically I'm looking to log to a unique
file every time the worker is used?
If this is possible or anyone can suggest a work around I would really appreciate it.

Thanks,
Mark.