[Tilecache] Adapting TileCache as a Java servlet

[Jon Blower]

I've created a brief Wiki page with some instructions and a link to
download the Java-fied TileCache.  Any comments welcome!

http://www.resc.rdg.ac.uk/twiki/bin/view/Resc/TileCacheAsJavaServlet

Cheers, Jon

On 3/26/07, Chris Holmes <cholmes at openplans.org> wrote:
> Awesome!  Would love to test it out.  Ideally I'd like to make it a
> module of GeoServer that we can include by default.
>
> How's the performance under Jython?  That was one of my big worries with
> this approach.
>
> The other thing I'd like to do is play with alternate cache
> implementations, leverage JBossCache or OSCache to get LRU algorithms
> and distributed caching.  This might actually work well with your #2,
> since those caches have a lot of control over max size and all that.
>
> Chris
>
> Jon Blower wrote:
> > Hi all,
> >
> > For reasons that I went through in a previous post on the OpenLayers
> > mailing list (I think Christopher copied this list too), I'm looking
> > to integrate TileCache with my ncWMS software so that I can cache
> > tiles of data arrays (rather than images), allowing the same tiles to
> > be rendered in different ways.
> >
> > To this end, I have converted TileCache to work as a Java servlet,
> > through the magic of Jython.  This seems to be working fine, but it
> > has raised a few questions:
> >
> > 1) Will TileCache cache images correctly for WMSs that support the
> > TIME and ELEVATION dimensions (and indeed, other arbitrary
> > dimensions)?
> >
> > 2) Is there any automatic management of the cache (e.g. deletion of
> > old tiles to prevent the cache getting too large) or is this something
> > I'd have to code myself?
> >
> > 3) For information: Jython 2.2b1 (the latest version) does not
> > implement the os.access function.  Therefore I had to make relatively
> > minor edits to Cache.py to simulate this function using the
> > java.io.File class.  My modified Cache.py should work in both Python
> > and Jython (I can post it if that would be helpful).
> >
> > Other than point (3) above, the TileCache code seems to work fine in
> > Jython, but I've only done very limited testing.  Is anyone interested
> > in trying my Java version out?  It would be useful to know if it works
> > for others too.  For those of you who know about these things, I've
> > produced a WAR (web archive) file that should just drop into your
> > Tomcat/Jetty/whatever web application server.
> >
> > Cheers, Jon
> >
>
> --
> Chris Holmes
> The Open Planning Project
> http://topp.openplans.org
>
>


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Dr Jon Blower              Tel: +44 118 378 5213 (direct line)
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