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Roché Compaan wrote:
> On Fri, 2007-02-23 at 06:55 -0500, Tres Seaver wrote:
>> Roché Compaan wrote:
>>> I'm curious, has anybody played around with the idea of caching ZCatalog
>>> results and if I submitted a patch to do this would it be excepted?
>>> I quickly coded some basic caching of results on a volatile attribute
>>> and I was really surprised with the amount of cache hits I got
>>> (especially with a Plone site that is a heavy user of the catalog)
>> +1. I think using the 'ZCachable' stuff (e.g., adding a RAMCacheManager
>> and associating a catalog to it) would be the sanest path here.
> Cool idea. I haven't done any coding involving OFS.Cache though. Looking
> at it briefly it looks like one can modify the catalog to subclass
> OFS.Cacheable and then use the ZCacheable_get, ZCacheable_set and
> ZCacheable_invalidate methods to interact with a cache manager. This
> needs to be pretty explicit though. Are there any side effects that I
> should guard against if the catalog subclasses OFS.Cache?
I don't think so. Here are some random thoughts on the idea:
- The 'searchResults' method must pass its keyword arguments as
part of the cache key.
- I don't know if there is a reasonable way to do 'mtime' for
the catalog: we would like to be able to get an mtime cheaply
for the BTrees (indexes, the 'data' container), but I don't know
if that is possible.
- The "right" place to do this feels like the 'searchResults' of
ZCatalog, just before it calls 'self._catalog.searchResults'.
- The CMF's catalog overrides 'searchResults', but calls it at
the end, so everything there should work.
Tres Seaver +1 540-429-0999 [EMAIL PROTECTED]
Palladion Software "Excellence by Design" http://palladion.com
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