Status tracking

Hello.

I am using http core NIO and investigating how to provide feedback on upload
(PUT/POST) and download (GET) entity enclosing requests.  Essentially, I'd
like to know when a certain number of the overall bytes have been
transmitted/consumed.  Do you have any strategies for this for NIO?

Thanks,
Adrian Cole
jclouds <http://code.google.com/p/jclouds>