Please see the discussion:
Based on discussions with Trustin, this is functionality that will be in the 2.0 release. It seems to be inefficient to create a new selector/thread for each IoService. This means that an application that is listening on 2 ports, would need two java.nio.Selectors, two Selector worker threads and each have a pool of workers.
Not only does this create much duplication, but more threads will be created than may be necessary.