Take a look how you can hook File calls. 
https://github.com/pirj/distributed-shelf
If you figure out the file is read orr written, you can fetch/update
your DB, or redis as suggested.

On Jan 24, 11:37 pm, bluewave <[email protected]>
wrote:
> I have an application I want to use (http://www.flashxml.net/galleries/
>
> )
> this application needs to update an xml file with all the images information
> in it.
> if I would be working on disk based system I would just update this file so
> the web browser can read it.
> because I am using Heroku I can not update this file in the OS. do you know
> if I could use send_data to send this xml file instead of using the file on
> the OS? if you now how to do this please share this with me.
>
> Thanks

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