how to tell if sshd ClientSession is closed

[Darren Shepherd]

I'm upgrading from sshd-core 0.9.0 to 0.11.0 and previously there was
a ClientSession.getState() method that I was using to tell if the
session has been closed.  That method is gone now.  What can I use to
tell if the ClientSession is open or closed?

Darren