Rails - Jun 2006 - Sans Periodically call remote-- possible?

I was wondering, imagine this situation. You have browser 1 on machine 1 
and browser 2 on machine 2. I created a div so that I can update certain 
elements on the database. Is it possible to have the data rendered on 
browser 2 using ajax but without using the periodically call remote? Is 
it possible to use the submit event from browser 1 to trigger browser 2 
to update?

thanks,

Bing

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Posted via http://www.ruby-forum.com/.

anyone pls?

Guest wrote:
> I was wondering, imagine this situation. You have browser 1 on machine 1 
> and browser 2 on machine 2. I created a div so that I can update certain 
> elements on the database. Is it possible to have the data rendered on 
> browser 2 using ajax but without using the periodically call remote? Is 
> it possible to use the submit event from browser 1 to trigger browser 2 
> to update?
> 
> thanks,
> 
> Bing

-- 
Posted via http://www.ruby-forum.com/.

On Thu Jun 22, 2006 at 04:28:34AM +0200, Bing Tan wrote:
> anyone pls?
your main option is probably javascript''s settimeout(), selecting
things in the db newer than a server-generated timestamp stored in the client
and rjs to update any newer elements that may have arrived.. if you plan on
doing a lot of this, you might want to check out a framework like twisted - its
written in python, and is expressly designed for these kind of realtime
messaging situations, and also works with many other protocols besides http..

> 
> Guest wrote:
> > I was wondering, imagine this situation. You have browser 1 on machine
1
> > and browser 2 on machine 2. I created a div so that I can update
certain
> > elements on the database. Is it possible to have the data rendered on 
> > browser 2 using ajax but without using the periodically call remote?
Is
> > it possible to use the submit event from browser 1 to trigger browser
2
> > to update?
> > 
> > thanks,
> > 
> > Bing
> 
> 
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> Posted via http://www.ruby-forum.com/.
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> Rails@lists.rubyonrails.org
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>

carmen wrote:
> On Thu Jun 22, 2006 at 04:28:34AM +0200, Bing Tan wrote:
>> anyone pls?
> 
> your main option is probably javascript''s settimeout(), selecting
things
> in the db newer than a server-generated timestamp stored in the client 
> and rjs to update any newer elements that may have arrived.. if you plan 
> on doing a lot of this, you might want to check out a framework like 
> twisted - its written in python, and is expressly designed for these 
> kind of realtime messaging situations, and also works with many other 
> protocols besides http..

Wow, I was pretty overwhelmed after checking twisted. Well, I don''t
have
any knowledge with python for one. Have you tried using twisted to work 
with ruby? I checked out thr RAA and found several event frameworks but 
again, still overwhelmed with which project maybe possible for what I 
need- as I searched for projects with the keyword "events"


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On Jun 21, 2006, at 8:44 PM, Bing Tan wrote:
> carmen wrote:
>> On Thu Jun 22, 2006 at 04:28:34AM +0200, Bing Tan wrote:
>>> anyone pls?
>>
>> your main option is probably javascript''s settimeout(),
selecting
>> things
>> in the db newer than a server-generated timestamp stored in the  
>> client
>> and rjs to update any newer elements that may have arrived.. if  
>> you plan
>> on doing a lot of this, you might want to check out a framework like
>> twisted - its written in python, and is expressly designed for these
>> kind of realtime messaging situations, and also works with many other
>> protocols besides http..
>
>
> Wow, I was pretty overwhelmed after checking twisted. Well, I
don''t
> have
> any knowledge with python for one. Have you tried using twisted to  
> work
> with ruby? I checked out thr RAA and found several event frameworks  
> but
> again, still overwhelmed with which project maybe possible for what I
> need- as I searched for projects with the keyword "events"
>
>
> -- 
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

Have a look at EventMachine. Its on rubyforge.org. Its a very nice  
event driven framework  for ruby.

-Ezra

Ezra Zygmuntowicz wrote:
> On Jun 21, 2006, at 8:44 PM, Bing Tan wrote:
> 
>>> on doing a lot of this, you might want to check out a framework
like
>> but
>> again, still overwhelmed with which project maybe possible for what I
>> need- as I searched for projects with the keyword "events"
>>
>>
>> -- 
>> Posted via http://www.ruby-forum.com/.
>> _______________________________________________
>> Rails mailing list
>> Rails@lists.rubyonrails.org
>> http://lists.rubyonrails.org/mailman/listinfo/rails
> 
> 
> Have a look at EventMachine. Its on rubyforge.org. Its a very nice
> event driven framework  for ruby.
> 
> -Ezra
Hi Ezra,

I was just about to check EventMachine out. But can you help me out, 
when you say it''s single-threaded what does it exactly mean? it means 
that each client browser can only make one thread with the server at a 
time?

thanks,

Bing

-- 
Posted via http://www.ruby-forum.com/.

I had checked out Eventmachine and had a look at the forum. There was an 
inquiry there by a potential user with almost the exact same problem as 
mine and one of the responses indicated that, what I''m trying to do
here
is to evade the polling action of ajax which eventmachine isn''t build 
for.

On another note though, do you think it is possible to put an observer 
field on a remote 2 browser that references against the actions from my 
browser? It''s interesting but I totally don''t have any idea
how it is
done. For example I was trying to check out gtalk inside gmail on my 
browser. whenever I am typing, the person I''m talking to sees that 
"user1 is typing..."

does it mean that upon creation of the js window, an observer is created 
that is referenced again the person I am talking to?

These things are taken for granted so often but it''s so painfully 
difficult to do!

thanks,

Bing


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> On another note though, do you think it is possible to put an 
> observer 
> field on a remote 2 browser that references against the 
> actions from my 
> browser? It''s interesting but I totally don''t have any
idea how it is
> done. For example I was trying to check out gtalk inside gmail on my 
> browser. whenever I am typing, the person I''m talking to sees that
> "user1 is typing..."
> 
> does it mean that upon creation of the js window, an observer 
> is created 
> that is referenced again the person I am talking to?
Without looking too much into it I''d hazard a guess that this
communicates through the web server.

Browser 1 updated an input field

Ajax sends it to the web server @ google gmail.com?

Browser 2 polls the web server via Ajax to receive Browser 1''s text.

Without installing additional software on the browser clients I don''t
think it''s possible to do peer-peer chat.

HTH

Ross

Ross Dawson wrote:
>> is created 
>> that is referenced again the person I am talking to?
> 
> Without looking too much into it I''d hazard a guess that this 
> communicates through the web server.
> Browser 1 updated an input field
> Ajax sends it to the web server @ google gmail.com?
> Browser 2 polls the web server via Ajax to receive Browser 1''s
text.
Actually I think that''s how they''re doing definitely and the
question is
how are they doing it? How do you have Browser 2 (B2) pick the values up 
from Browser 1 (B1)? Note that it''s true B1 to B2 communication will be
doable but imagine if you even just have 10 users. Since they are all 
served by the same controller, they will be fighting over the same 
resources and since B2''s polling mech is independent from the actions
of
B1''s message sending, eventualy with more users, you will see messages 
being rendered to other users will be missent and unrendered in some 
(bec the polling mech is all calling the same def and they are assigning 
their own unique values)
> Without installing additional software on the browser clients I
don''t
> think it''s possible to do peer-peer chat.
This is what the web chat on gtalk does. No installation needed and you 
can do peer to peer.

> HTH
> 
> Ross
Thanks,

Bing

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