On Sun, Oct 19, 2008 at 5:19 AM, PonasNiekas <[EMAIL PROTECTED]> wrote: > > Hi, > > I'm about to write an app, which is going to do long running (~1 to > ~60 minutes) calculations (meanwhile, the user who triggered the > calculation will get message like "calculation in progress" or smth). > > I'm wondering what is the right place or best practice to do such > calculations, custom middleware or view ?
Neither. A view isn't really the right place to be performing long-lived calculations. While the calculation is being performed, the user won't have any feedback; on top of that, it will hold open a connection on your webserver and lock out any other possible connections to the webserver. It doesn't really matter where in the response chain the calculation occurs (view, middleware, or otherwise) - the outcome will be the same. This isn't really a problem that can be solved with a single view. You need to look at breaking up the problem a little bit: 1) The user visits a view that registers that a long lived job needs to be performed and adds the job to a queue 2) A process that runs in the background, independent of the webserver, processing jobs that have been queued 3) A view that can poll the queue to inspect the status of a given job 4) A view that shows the queue status to the user. When the user visits view 1, the job is queued, and the user is redirected to view 4. View 4 uses AJAX style requests to poll view 3 to provide status updates until the job has been completed. The main work is done by task 2, which runs independent of the webserver. This keeps all http connections short lived (which frees up web server resources) and provides the ability for continuous feedback on job progress. Yours, Russ Magee %-) --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
