They're being used side by side and running in separate processes.
For Campus Bubble, tornado app is a relatively simple push broker. Whenever something happens, Flask app pushes notification to a broker and broker pushes them in fan-out fashion to subscribers.
For Campus Bubble, tornado app is a relatively simple push broker. Whenever something happens, Flask app pushes notification to a broker and broker pushes them in fan-out fashion to subscribers.
I even wrote another blog post a while ago about possible approach: http://mrjoes.github.io/2013/06/21/python-realtime.html