[mapserver-users] Mapcache question.

[Stephen Woodbridge]

Jerl,

http://mapserver.org/cgi/runsub.html

Sounds like you do not have a validation_pattern for the data parameter.

-Steve W

On 12/4/2011 4:23 PM, forums wrote:
> I almost have it, I just can't seem to get the targetdate dimension to
> populate.
>
> /mapcache/gmaps/country at WGS84/1/1/0.png works fine if I don't have the
> layers that require the targetdate parameter.  I get a "parameter
> pattern failed validation" error returned from Mapserver when I have the
> necessary layers defined in the mapcache config file.
>
> The obvious thing for me to try was:
> /mapcache/gmaps/country at WGS84/1/1/0.png?targetdate=201112042105
>
> But that failed.  Is there a way to get the targetdate to fill in? I've
> moved it around a bit, but still can't get it to fill in.
>
> Thanks again!!
>
> Jerl
>
>
> On Sun, Dec 4, 2011 at 2:59 PM, forums <forums at craniumjuice.com
> <mailto:forums at craniumjuice.com>> wrote:
>
>     Thanks Stephen and Thomas.
>
>     I think I'll be good with the dimension and the disk cache.
>       Unfortunately, the apache we have doesn't have memcache built into
>     it (too much hassle to upgrade it right now) and the version of
>     SQLite is too old...also a hassle to upgrade.
>
>     I was able to get it to load the proper map when just using the
>     entire bounding box, the whole world.  Now to make it work with the
>     the tilemode for google...which looks like that should be straight
>     forward??
>
>
>     Thanks guys!!
>
>     Jerl
>
>
>     On Sun, Dec 4, 2011 at 2:00 PM, thomas bonfort
>     <thomas.bonfort at gmail.com <mailto:thomas.bonfort at gmail.com>> wrote:
>
>         Jerl,
>         mapcache itself does not do any pruning of the caches it has
>         created,
>         but you can get the same effect by using a cache backend that
>         supports
>         expiration (i.e. memcache).
>         Mapcache can fit your need, provided:
>         - you configure your tileset with a "targetdate" <dimension>-
>         you use
>         a memcache backend to store the created tiles, and set an <expires>
>         value in mapcache to 5 hours
>         If the memory requirement for storing 5 hours worth of tiles is too
>         important for a memcache server instance, you can have a look at
>         membase which will also store less frequently used data to disk. The
>         membase protocol is compatible with memcache, so you can use either
>         memcache or membase with the same mapcache configuration.
>
>         Of course, by running a script every hour to delete expired tiles as
>         you are doing now, you can then use the classic disk based cache
>         backend.
>         regards,
>         thomas
>         On Sun, Dec 4, 2011 at 20:13, forums <forums at craniumjuice.com
>         <mailto:forums at craniumjuice.com>> wrote:
>          > Hi:
>          >
>          > I hope this is the proper place to ask questions about
>         Mapcache since it's
>          > been moved into the trunk of Mapserver.
>          >
>          > I'm wondering if Mapcache can help with a particular setup,
>         and if so maybe
>          > some advice or direction on where to start?
>          >
>          > Here's the setup.  Every 5 minutes a new set of GeoTiffs are
>         created in a
>          > new directory.  I create a tileindex for the GeoTiffs and use
>         those in the
>          > map layer.  Every hour, anything more than 5hours old gets
>         deleted.
>          > I have a single mapfile setup.
>          >
>          > The general layer is setup like:
>          >
>          >     LAYER
>          >         NAME 'IMG1'
>          >         METADATA
>          > 'wms_title' 'IMG 1'
>          > 'wms_srs' 'EPSG:4326'
>          > 'wms_extent' 'MINX MINY MAXX MAXY'
>          > 'default_targetdate' ''
>          > 'targetdate_validation_pattern' '^[0-9]{12}$'
>          >         END
>          >         STATUS ON
>          >         TILEINDEX '/PATH/TO/IMG/DIR/%targetdate%/TILEINDEX.shp'
>          >         TILEITEM 'Location'
>          >         TYPE RASTER
>          >     END
>          >
>          >
>          > I'm currently loading these images as overlays for
>         Googlemaps. using the
>          > mode=tile&tilemode=gmaps...&targetdate=2011...etc.
>          > Problem is it's too slow. I end up loading hundreds of
>         images, as I
>          > basically create an animation using sequential times.
>          >
>          > I'd like to be able to have a single mapcache config file,
>         that will pass
>          > the date through to pull the proper shapefile, and have the
>         result cached so
>          > next time it's loading off the disk.  MOST of the images end
>         up being
>          > blank/transparent tiles.
>          >
>          > Is Mapcache a good choice for this?
>          > The front end for this is just a simple GoogleMaps viewport,
>         but ends up
>          > loading multiple timeslots for display.  It generates the
>         request URL (not
>          > currently in WMS fashion but could be).
>          >
>          > Thanks for any help I can get.
>          >
>          > Jerl
>          >
>          >
>          >
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>
>
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