Server Push, Xforms

[Andrew Bailey-3]

Hi,

I was looking at the question about server push
http://www.nabble.com/Form-refresh-td12191652.html#a12232773

The solution of polling isnt an option, the event could happen in .5
seconds or 5 minutes so polling every .5 seconds doesnt sound too
good, although
 I suppose I could do some form of incremental wait, delay=k*time already spent.

Are there any xforms extensions for this?

If not, (I know that its more of an ajax question), but does anyone
know of a javascript library to
handle the "comet" request?

Andy Bailey


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[Erik Bruchez]

> I was looking at the question about server push
> http://www.nabble.com/Form-refresh-td12191652.html#a12232773
>
> The solution of polling isnt an option, the event could happen in .5
> seconds or 5 minutes so polling every .5 seconds doesnt sound too
> good, although
> I suppose I could do some form of incremental wait, delay=k*time  
> already spent.
>
> Are there any xforms extensions for this?

Well, XForms 1.1 specifies asynchronous submissions. In theory, you  
can start a submission, then keep using the form, and then when the  
submission completes it can triggers actions with the usual xforms-
submit-done event. With this approach, anytime the submission  
completes it would have to reconnect to listen for the next event.

This could work, however we don't implement that yet. It is tricky to  
do on the server, as it also needs a push communication mechanism  
between server and client, and this means something like comet. So we  
are back to using comet, except here it would be implemented natively  
in the browser.

Note that comet also puts quite some requirements on the server if you  
have lot of users around, since it will keep one connection open for  
every user. Some people of course have been working on creating  
scalable server solutions though.

> If not, (I know that its more of an ajax question), but does anyone
> know of a javascript library to
> handle the "comet" request?

I think that Google will be your friend here.

-Erik

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Orbeon Forms - Web Forms for the Enterprise Done the Right Way
http://www.orbeon.com/



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[Andrew Bailey-3]

> Well, XForms 1.1 specifies asynchronous submissions.
...
>  however we don't implement that yet.

Do you have any timeframe for the implementation?

>> If not, (I know that its more of an ajax question), but does anyone
>> know of a javascript library to
>> handle the "comet" request?
>
> I think that Google will be your friend here.

Yes I know! I was just wondering ...

Thanks,
Andy Bailey
http://www.hazlorealidad.com


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[Erik Bruchez]

>> however we don't implement that yet.
>
> Do you have any timeframe for the implementation?

For @delay, we hope over the next 2 months, but there is no guarantee  
as usual.

>>> If not, (I know that its more of an ajax question), but does anyone
>>> know of a javascript library to
>>> handle the "comet" request?
>>
>> I think that Google will be your friend here.
>
> Yes I know! I was just wondering ...

That's understood ;-)

-Erik

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Orbeon Forms - Web Forms for the Enterprise Done the Right Way
http://www.orbeon.com/



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