[Catalyst] A suitable method to redraw a page

Tomas Doran bobtfish at bobtfish.net
Wed Sep 24 09:19:34 BST 2008

On 24 Sep 2008, at 00:30, Dermot wrote:

> 2008/9/23 Mesdaq, Ali <amesdaq at websense.com>:
>> I think ajax would be your friend here.
> I think I'll try something like that. As the files and Cat App are on
> one server and the referrer is a different server, I will have the
> referrer call a local script and fire a request from there.

Are you sure that you actually want your web server running this  
script? It may not be an issue for you, but if this needs to be  
scalable then I'd highly recommend using a distributed job queue such  
as TheSchwartz.. This also buys you other architectural benefits as  
you've done a load of decoupling, so you can now trivially have  
command line admin tools which monitor jobs in progress etc...

If you take this approach, you don't have a problem, your first hit  
does a POST which submits a job (quick), then redirects the user to a  
page which refreshes regularly that reports on the job status, and  
once the job is complete, the next refresh can display a different  
page / redirect the user again as appropriate.

Also, you don't need no steenkin Javascipt (although you're free to  
use it to improve the user experience, you have graceful  
degredation), and you've got a system that can trivially be  
abstracted to handle running / reporting status on a whole multitude  
of jobs...


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