From: Daniel N <has.sox@...>
Date: 2007-07-16T11:25:46+09:00
Subject: Re: Real project -- general application structure

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On 7/15/07, Daniel N <has.sox@gmail.com> wrote:
>
>
>
> On 7/14/07, Ricardo Jasinski <rjasinski@gmail.com> wrote:
> >
> > > So the data collection app stores it in the DB, and the web page just
> > > retrieves the latest data
> > > from the DB when a user navigates to the page. Piece of cake! 9^)
> >
> > Hi Chris,
> >
> > thanks for your input! Yes, it is really almost a piece of cake,
> > except that the data displayed on the page must be updated whenever
> > new information is sent by one of the sensors (without having to click
> > 'refresh' on the web browser).
> >
> > Of course a periodic page reload could take care of this issue, but I
> > believe we can do better than that...  =)
> >
> > Cheers,
> >
> > Ricardo
>
>
> Richardo
>
> There is not really a built in way with Rails that I know of to push data
> out to the client, which is what it sounds like you want to do.  Normal web
> servers respond to a request from the client.  There is no mechanism to push
> data out to the clients from a server side event, since there is no list of
> clients stored on the server, where would you send it to?  Also browsers are
> not really made for doing this.
>
> I believe there is a solution to this called COMET
>
> http://en.wikipedia.org/wiki/Comet_(programming)<http://en.wikipedia.org/wiki/Comet_%28programming%29>
>
> and there is a rails plugin although I have never used it.
> http://code.google.com/p/ajaxmessaging/
>
> HTH
> Daniel
>

In addition to the comet plugin there is also juggernaut

http://juggernaut.rubyforge.org/

I found a writeup on rails spikes
http://www.railspikes.com/tags/comet

Cheers

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