Hmmm...GeoWebCache must have some GDAL Depends but I'm not entirely sure. The pure Java approach to do something similar would be cool.
Adam On Sun, Oct 14, 2012 at 9:23 AM, Joe White <[email protected]> wrote: > It doesn't according to this : > http://gis.stackexchange.com/questions/33951/does-geowebcache-uses-jai > > Joe > On Oct 14, 2012, at 9:18 AM, Adam Estrada <[email protected]> wrote: > > > Thanks Martin! Do you know off hand if geowebcache uses JAI TileCache? > > > > Adam > > > > Martin Desruisseaux <[email protected]> wrote: > > > >> Hello Adam > >> > >> Please feel free to ask as you want, no problem :) > >> > >> The Cache class is for any kind of object associated to an identifier. > >> For example Coordinate Reference Systems (CRS) are often specified as > >> the primary key value in the EPSG database. For example "EPSG:4326" > >> stands for a geographic CRS using the WGS84 datum, and "EPSG:3395" > >> stands for a Mercator projection using the WGS84 datum. SIS will provide > >> a factory creating CRS objects from an EPSG code. But if the same EPSG > >> code is specified many time, we want to return the existing instance. > >> This will happen often since GIS applications typically contain > >> thousands of geometries using the same CRS. > >> > >> This applies also to metadata, for example getting a CI_Citation object > >> from an ISBN code. This could apply to images where the identifier could > >> be the absolute path name, etc. In the later case, since images can be > >> large, we need to measure the cost of keeping those objects in a cache. > >> > >> About caching of map tile, maybe the Cache class could be used for that, > >> but we way also use something more specialized. We could take > >> inspiration from the TileCache interface from Java Advanced Imaging [1] > >> for instance. > >> > >> Martin > >> > >> [1] > >> > http://download.java.net/media/jai/javadoc/1.1.3/jai-apidocs/javax/media/jai/TileCache.html > >> > >> > >> Le 14/10/12 09:35, Adam Estrada a écrit : > >>> Martin, > >>> > >>> I am catching up on emails from a long week of conferences and a little > >>> vacation time so please forgive me if this response sounds redundant > or at > >>> all dense. Is your cache class to be used as an actual map cache to > store > >>> and retrieve map tiles? It kind of sounds like that as we often test > to see > >>> if cached tiles have been changed by counting pixels and their values > >>> before generating new ones. If nothing has changed, leave them alone, > >>> right? Can this class be used like that or is that the intent? > >>> > >>> Adam > >> > >
