On 02/12/2012 12:40 PM, Gabriel Roldan wrote:
> If you are using a TIME parameter in your request, the only way the
> GWC mediator said it does match a tile cache is if you have a
> parameter filter[1] for the TIME parameter keyword configured for the
> layer.
Okay, this makes sense with the code I'm seeing, and I've been trying to
figure out how to set such a parameter filter on one of my layers.
> Check GWC.isCachingPossible(TileLayer, GetMapRequest):
>
> if (null != request.getTime() && !request.getTime().isEmpty()) {
> if (!filterApplies(filters, request, "TIME",
> requestMistmatchTarget)) {
> return false;
> }
> }
>
> If that's not working, then report the bug back here please.
I don't see this method; our current geoserver is version 2.1.2, so I've
been going off of its code. Is this new since then?
> Now, at the current state of the gwc integration, you can't configure
> a parameter filter for an embedded geoserver layer. What you can do is
> to configure a wmsLayer in <data dir>/gwc/geowebcache.xml, name it
> something different than the geoserver layer (eg, "states" instead of
> "topp:states"), make it point to the geoserver layer you want to
> cache, and configure a parameter filter for time (this is about to
> change in the very near future. You'll be able to configure these and
> other caching properties through the geoserver UI, and enabling
> parameter filters for STYLES, TIME, and ELEVATION will be as simple as
> a checkbox).
Okay, so to check if I've got this: I can't set this up directly on my
own layer. What I have to do is set up a GWC layer that's backed by my
own layer and which does take a TIME filter, and then point OpenLayers
to that. Right?
> As Andrea mentioned, building a tile cache for all your TIME values
> might lead to a huge cache. Although you don't need to pre-seed them
> all. You can rather let the cache being built on demand, and set up
> the disk quota limit so that gwc cleans up less recently/frequently
> used tiles up to a disk quota usage limit.
Oh, yes, we're not pre-seeding the whole thing. We just want caching to
speed up repeated access to recently-viewed tiles.
Thanks again for your help. If I've understood you I think I can make
this work.
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