How can I connect GWT to CometD/Bayeux events?

Question

I've got a GWT application, which periodically needs to update the screen with new tick items as they come in. We also have messages published by a CometD/Bayeux server (for a different AJAX application) and I'd like to consume them in my GWT.

Of course, I can drop into JavaScript, hook up Dojo, and receive callbacks in the JavaScript layer - and from there, route a call into GWT Java code via a JSNI - but there doesn't appear to be any support in GWT directly for using long push or async calls other than the non-RESTful RPC.

How have you integrated GWT and Bayeux?

Answer 1

Since this question was originally posted there have been a few advances:

• http://code.google.com/p/google-web-toolkit-incubator/wiki/ServerPushFAQ
• http://code.google.com/p/gwteventservice/
• http://code.google.com/p/gwt-comet/

Answer 2

JSNI is not that bad option as it might sound first. There is a DZone refcardz 'GWT: Style, Configuration and JSNI Reference' which I have found helpful.