2009/3/3 Jonathan <jricket...@gmail.com>:
>
> I am using a restful interface for an ajax application and want to be
> able to store the results of queries in memcache, as much of this data
> is read much more often than it is written, but it is occasionally
> written.
>
> I have been trying to think of strategies for how to do this, whilst
> also maintaining the ability to invalidate the cache when necessary.
>
> so for example:
> the user requests page 1 of their objects (0-9) and I store them with
> a key of "modelName-userName-pageNum"
> the user requests page 2 of their objects (10-19) and I store them
> with a key of "modelName-userName-pageNum"
> the user modifies an object on page 2, (or deletes it, or creates a
> new one) and I want to invalidate all "modelName-userName" cached
> lists.
>
> how do I do this???
If you want to delete *all* 'modelName-userName' items, why not store
a mapping (just one cached value) with 'modelName-userName' as key.
For example:
from google.appengine.api import memcache
key = 'model-user'
# load cached values
data = memcache.get(key)
if data is None:
data = {}
# query page1
page1 = some_query()
data[1] = page1
memcache.set(key, data)
# return response
# query page 2
data = memcache.get(key)
if data is None:
data = {}
page2 = some_query()
data[2] = page2
memcache.set(key, data)
And if something's changed, just do "memcache.delete(key)".
Andi
>
>
> jonathan
> >
>
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