[Zope] Is ZEO my friend...

[Paul Winkler]

On Fri, Jan 10, 2003 at 01:42:40AM +0100, Gilles Lenfant wrote:
> Hi zopistas,
> 
> Here's the future problem...
> 
> A web app records "todo" tasks into a queue. The queue will be a folderish,
> the "todo" task will be file like objects with properties saying what to do
> with.
> 
> Then a background process will read that queue in a loop, remove "todo"
> tasks 1 per one, the oldest first and start processing accordingly.
> 
> What about using a ZEO client app for this kind of console python app ?

the background process you mean? sounds fine.

> As
> ZODB is transactional, ther should not be read/write conflicts on objects ?

just sync on boundaries and you'll usually be OK, but you
will probably need to catch e.g. writeConflictError and decide whether to
re-try the transaction or what. 

Note that I haven't actually
written an app like this but AFAIK that's all there is to it.

> If I'm in the good direction, are there some examples or tutorials using
> that specific architecture ?

playing around in an interactive debugging session should give you
the idea... getting started is very easy:

import Zope
app = Zope.app()
todo_folder = app.path.to.my.todo_folder
...
# save changes
get_transaction().commit()
# load other clients' changes
app._p_jar.sync()
# abort a transaction
get_transaction().abort()

-- 

Paul Winkler
http://www.slinkp.com
Look! Up in the sky! It's THE GUTS!
(random hero from isometric.spaceninja.com)