[Biojava-l] log4j

[hilmar.lapp@pharma.Novartis.com]

Sent by:  biojava-l-admin@biojava.org


To:   Gerald.Loeffler@vienna.at
cc:   Biojava-l@biojava.org
Subject:  Re: [Biojava-l] log4j


for the core code. Any exceptional circumstances (errors, warnings etc)
should realy be handled using exceptions. Any feed-back information should
be propogated with events & listeners. If we structure the code correctly,
exceptions can be caught, logged, and recovered from in a client-dependant
way.

     Basically, I agree. From my experience, there's a problem with
     triggering exceptions in the case of batch operations, like 'annotate
     all seqs a database object returns'. You as a client don't want to
     abort the called method at a particular sequence raising an exception
     unless you can easily resume the operation, something which is often
     not the case. What I did is to propagate such exceptions as events,
     that is, create an ExceptionHandler interface, and methods carrying
     out batch operations which are supposed not to fail on the first
     exception now call an ExceptionHandler, and resume or abort based on
     what the handler returns.

          Hilmar