HTML 5 Ruby on Rails Server Side Events

I am new to HTML5 and Rails. I am trying to learn server side events to use it in my project.I have some doubts. Can I use SSE to send data whenever there is an updat开发者_如何学Goe in database ? If possible how to go with it. Can the EM monitor database directly?

Which one is the best event based server (mongrel/rainbow/thin/goliath or any other one)?

Thank you for your time.

A simple but hands on example of SSE with Goliath (and deploying to heroku).

How you generate events really depends on your app logic.