On 14 Feb 2012, at 13:10, Jedrin wrote:
You could use pushing from the server instead of
polling.http://railscasts.com/episodes/260-messaging-with-faye
I'll add another railscast that appeared a few weeks later that might
make implementing a push server even
easier:http://railscasts.com/episodes/316-private-pub
What is the basic concept here ? Is this standard HTML/Javascript ?
Everything in HTTP seems counter to that I have seen, so I am missing
something ?
Web technology has advanced quite a bit over the years. One feature of
HTML5 is Websockets, which allow a persistent connection with the
server and thus allowing the server to push data to the client without
any client interaction or workarounds like polling with a certain
interval.
Frameworks like Faye use Websockets when available and fall back to
alternative methods for older browsers (a Flash-based socket or long
polling, which is not the same as interval polling).
Simply put (it's actually a bit more complex) the following happens:
- User loads the page
- Javascript opens a persistent socket to the Faye server (using a
named channel if you want it to)
- From your Rails app, you send messages to the Faye server, which
automatically distributes it to all client connections for that
particular channel.
The Railscasts explain the concept quite nicely IIRC.
Best regards
Peter De Berdt
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