Re: [Myghty-users] Manual cache expiry

[Michael B. <mi...@my...>]

you should be able to call clear() on the cache instance returned by  
m.get_cache() within the template, as well as remove_value(key).   im  
not sure why get_container() screws it up but the API of cache.py is  
a little antiquated at this point (im working on replacements for all  
of this stuff, more on that soon).

id also suggest asking on the pylons-discuss list since those guys  
use the cache API a lot.


On Dec 26, 2006, at 7:03 PM, Jens Hoffrichter wrote:

> Hello everyone,
>
> At first I want to thank every contributer to the great work which is
> delivered with Myghty, it's so much fun to work with it, it is so
> simple and yet powerful! Keep on rockin' :)
>
> But with my current work a problem aroused I'm not able to solve
> myself, and neither the documentation nor the web nor the source code
> is much help to me.
>
> I have the following situation:
>
> I'm using Myghty 1.1 with Python 2.4.4, apache 2.3.3 with  
> mod_python 3.2.10
>
> I have XML documents in a database and transform them via XSL to HTML.
> The XML documents are seldom updated, so caching of the transformation
> results would be fine, and as the documents are not accessed that
> often (but there are lots of them ;) ), a long cache time would be
> fine, too.
>
> So I keep track of the modification time of the docs via a SQL
> trigger, and want to expire the cache manually if the documents
> change, so they are regenerated using the XSL. I don't want to wait
> for an automatic cache expiry, as I plan to set the expiry time to a
> day or so, and I want to have the changes in the docs reflected to the
> website in a very short timeframe.
>
> So I took a look at the caching api, saw that accessing the container
> would be the right thing to do, compare the db timestamp against
> .storedtime, and in a case of an updated doc I would call
> .clear_value() to have the page rebuilded.
>
> But as soon as I access the cache after creating a reference to the
> container with cache.get_container(key), there is always thrown a
> KeyError, regardless what I do with the container, the call of
> .get_container() is enough to "corrupt" the whole cache and getting
> template errors. And I don't see the reason for this in the source
> code :)
>
> What can I do to overcome this obstacle? How should I access the
> cache? The caching api itsself is not enough (yet) to allow access to
> the stored times etc., so currently I have to stick to the container,
> I think.
>
> Thanks in advance for any advices!
>
> Regards,
> Jens
>
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