[mapguide-users] TileCache, dynamic layers, and the Session

[Zac Spitzer]

my little tile service wish list:

1. a do not purge header setting for mapdefinition's
2. don't purge the tile cache when updating a db feature source definition
3. add basic cache headers for tiles
4. a HasTile function something along the lines of a http head which doesn't
trigger rendering
5. PutTile for pushing tiles around between a cluster of servers
6. Meta tiling (generating bigger tiles and slicing them into smaller ones)
7. Base layer group specific image formats ( ie make raster JPG and my carto
PNG8)

1. is desperately need http://trac.osgeo.org/mapguide/ticket/729
2. is being worked on http://trac.osgeo.org/mapguide/ticket/642

3,4,5 can be done via scripts and exposing the tile cache via http which I
have been doing myself for a while (nginx is super fast and lightweight)

6. is a huge performance win, i did some mucking around with imagemagik
convert
and a php and it was quite compelling. What was impractical is the fact the
tile size
is a server wide setting so you don't really want to do this unless the
server is
dedicated just for meta tiling (coz all mapguide clients assume 300px sq
tiles)

z

On Wed, Oct 29, 2008 at 2:58 AM, Jason Birch <Jason.Birch at nanaimo.ca> wrote:

> So, if you modify the runtime map, the tile cache no longer pulls images
> from Repositories/TileCache, but starts storing tiles under the session?
> That's bizarre.
>
> I know that RFC11 tried to move away from using the session repository
> for anything tile-based, but I wonder if the line "if a map's tile cache
> is cleared or its MapDefinition changed, the corresponding MgMap
> serialized form will be removed from the cache" has anything to do with
> the behaviour you are seeing.
>
> http://trac.osgeo.org/mapguide/wiki/MapGuideRfc11
>
> In general, the MapGuide tile cache could definitely stand some
> improvements, especially in making it easier to develop persistent tile
> caches that can be shared by multiple maps (including runtime maps) and
> without fear of invalidating the cache.
>
> Jason
>
> -----Original Message-----
> From: gingerbbm
> Subject: [mapguide-users] TileCache, dynamic layers, and the Session
>
> If I'm dynamically adding a session-specific layer to a map that employs
> base layer groups (i.e. tiles), is there any way to avoid having a
> session-specific tile cache generated?
>
> The dynamic layer is served via a separate request
> (GETDYNAMICMAPOVERLAYIMAGE) as a separate image - so in theory I should
> be
> able to have one tile cache used by all sessions.
>
> If this isn't possible it rather defeats the object of having a tile
> cache
> at all.
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> mapguide-users at lists.osgeo.org
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>



-- 
Zac Spitzer -
http://zacster.blogspot.com (My Blog)
+61 405 847 168
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