[Grok-dev] Re: Initialization/Background Code? Search the grok-dev
Philipp von Weitershausen
philipp at weitershausen.de
Sat Jun 7 17:11:42 EDT 2008
Kenneth Miller wrote:
> Is there a quick way to search the grok-dev mailing list? It's a bit
> hard to open it up by month and check out the subjects..
Use Google and the "site:mail.zope.org" modifier.
> Is there anywhere to put initialization code into an app or view?
> I've got a bit of code that parses some local files under the static
> directory, and I'm not sure where to place the code to do this. The data
> needs to be available to a particular view and it's associated viewlets,
> and *should* be updated whenever the view is called.
Views have an update() method for doing things that should happen before
the view is rendered (by a template).
What is it that you're putting into the 'static' directory, though? It's
only meant for application-specific resources, such as images, CSS
> How can I create a new thread for constant background updates?
By using Python's thread or threading module.
> I want to access information from the PyPI, but the rate at which I need
> information is too fast to call the PyPIs XML-RPC methods in order to
> retrieve the information. My solution was to keep a local "copy" of the
> PyPI index for quick access, but I need a thread or something that
> updates that local copy at a regular interval (every hour or so) and
> doesn't depend on a View to be called.
Sounds reasonable. You can even open a connection to the database from
that thread and modify the ZODB (which is, I think, what you want to do
in order to store the data):
from zope.component import getUtility
from ZODB.interfaces import IDatabase
db = getUtility(IDatabase)
conn = db.open()
root = db.root()['Application']
# do modifications here to root[...]
Just remember to keep the connection (and more importantly, the
transaction) short-lived so that you won't risk conflict errors with
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