I do have pretty good experience with caching (no problems with expired
images etc here), though I agree that it certainly not allways is worth
the effort. But especially the generation of static pages (or maybe
combined static parts and a cach) can get drastic results. But it is
probably you have to tweak for the occasion.
Eelco
Gili wrote:
I learnt very quickly that servlet-layer caching is a no go, at
least for me.
All the server-side caches I've been are unable (because they are
so generic) to map the dependency between a page and its images. So
for example, maybe the page gets a hit, which keeps it in the cache
but the images do not, so they expire. Now you end up with a case
where you've got a page where most of its images are broken.
Another possibility you might want to consider is that very often
it is more expensive to try to do generic server-side caching than
doing no caching at all. I ended up adding application-specific
caching inside each individual servlet. Doing it in a generic manner
would have actually resulted in slower than uncached results.
Gili
Eelco Hillenius wrote:
Hi,
The markup is cached anyway. You probably want the results cached.
There's tons of ways to do it, the most obvious ones being:
- using a seperate cache, e.g. implemented as a servlet filter. I've
used http://www.opensymphony.com/oscache/ for this in the past. If
you only have to cache bookmarkable pages (and actually caching
non-bookmarkable pages is not a good idea as they need session
state), that works quite good.
- generate static HTML. Many large sites just generate their whole
catalogue etc to static html files. You can't get better performance/
scalability than that. So, if you work on a really large scale site,
that might be an option.
Above two ways are not integrated with Wicket. We could consider
building in native support for caching, but as caching (at least the
kind of caching we're talking about here) spans multiple sessions, it
would not be a straight match with Wicket's design goals.
Eelco
Christian Essl wrote:
Hi,
My most used pages are product-catalog and product-detail. Both
pages are and should be bookmarkable. The product-catalog page uses
a ListView to show all products in a category. The detail pages uses
a form to add the prodcut to the shopping-basket:
Because the products do change only about every second week I want
to cache the markup for both pages (or better the actual panels
which show the products).
Is this possible in Wicket?
Thanks,
Christian
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