[development] Object Caching in DRUPAL-7?
nabil at gobrighttree.com
Thu Feb 26 16:21:52 UTC 2009
This is my first post on this list so pleas enlighten the ignorant.
IMO having a hook_nodeapi_load and hook_nodeapi_post_load could get a
little confusing and is redundant. I agree with Josh in that there
should be a $node->cacheable field.
The question is where does drupal check this field? For example I could
create a cache friendly content type and set the nodes of that type to
cacheable in (say hook_load). Another module could come along and alter
that node (hook_nodeapi_*) in a way that isn't cache friendly and
designate to as non-cacheable, what then?
On Wed, 2009-02-25 at 23:28 -0500, Nathaniel Catchpole wrote:
> In the node_load() caching patch we've added a
> hook_nodeapi_post_load() which is uncached - so poll implements
> hook_nodeapi_load() to get the options in there, and
> hook_nodeapi_post_load() to get user-specific information.
> There may well be a use case for a field_attach equivalent which does
> the same thing. Field already has a cache though, so if we're caching
> objects persistently there'd actually be no change on this specific
> On Wed, Feb 25, 2009 at 8:58 PM, Josh Koenig <josh at chapterthree.com>
> > There is the issue of distinguishing cacheable and
> non-cacheable fields.
> > Does D7 Fields API flag fields as cacheable to make this
> Off the top of my head, it would somewhat defeat the purpose
> object-caching to try and handle this on the per-field basis.
> really need field-level caching then, which is an order of
> more in complexity (if not more).
> That said, I'm not sure what a "non cacheable" field would be
> unless it was some kind of php computed value, which seems
> like an
> edge case. Am I mistaking your meaning here? In mose cases,
> the field
> values should only change when the object itself is updated,
> at which
> point the cache would be invalidated anyway, and the next load
> be fresh.
> This does break down if there's a computed value in a field.
> The most
> basic example I can think of is a node with PHP content for
> the body.
> Maybe something that displays the current time. As it stands,
> believe Drupal's page caching system grabs the output of that
> PHP and
> stores it for anonymous users, meaning they'll get out-of-date
> That's potentially a big deal if you're talking about
> caching for logged-in users, so perhaps we would treat nodes
> like this
> as "uncacheable."
> Anyway, let me know if I'm way off here.
> I'll also be checking up on Nedjo's patch, as that definitely
> like the right architectural solution for drupal 7 core.
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