March 20th, 2011, 01:18 PM
How to develop publish-subscribe service
This could be a more general question, related to web architecture.
I'm developing a web application using ruby on rails, with jQuery to implement some AJAX requests and other funny slide effects.
Now i'm trying to figure out how to implement a "publish-subscrive" service.
It's difficult to explain it, maybe an example is better:
on facebook, when a friend of you put a comment on your state, you can see it, without the refreshing of the page.
I need something similar: when someone else create a new item of an entity, the server ask the client to add this new item in a table (for example).
The problem is that I don't think it could be done, because the server cannot contact the client (if the client hasn't start the connection with a server, through a GET-POST request, for example)... but facebook does it ;-) so i'm trying to learn how to do a similar thing.
But it isn't so efficient.
Do u know how I can do it? Any suggestions?