[Apc-aa-coders] Site.php3: nocache and cache invalidation

[Mitra <mi...@mi...>]

I've had some weirdness with old versions of pages being retrieved 
from the cache.

One thing i notice is that on line 101 of slice.php3 it tests against 
nocache when doing a store.

If I understand the logic, shouldn't nocache ONLY apply to retrieving 
from the cache.

I.e. when you do a retrieve you set nocache, and it would ignore the 
cached value of the page, but would then cache the new, correct, page?

It looks like the cache isn't being invalidated as the Spot's are 
being changed, this appears to be happening in site/index.php3 which 
doesn't appear to be doing any cache invalidation.

I'm not sure how to invalidate the cache, since the example I find - 
site/modedit.php3:139  seems (if I understand things correctly) to 
invalidate the cache for all slices, so I'm guessing I'm 
misunderstanding something.

Am I correct in assuming that invalidate call in modedit.php3:139 is 
buggy, and that I should add the code

$cache = new PageCache($db,CACHE_TTL,CACHE_PURGE_FREQ); # database changed -
   $cache->invalidate("slice_id=".site_id);  # invalidate old cached values

into index.php3.

I've done this - and it appears to work - but I wanted to check I'm 
understanding the cache logic correctly before I commit to CVS.

- Mitra



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