MS RFC 22: Data adapter support

[Tamas Szekeres]

Steve,

I am planning to implement a fairly straightforward caching mechanism
ensuring to handle most of the requirements i had in the past. The
implementation will retain the feature object references in the memory
and a quadtree will be used to retrieve a subset of the features based
on the rectangle supplied by the WhichShapes call.
I will create the corresponding RFC as soon as possible according to
the degree of support of this RFC.
But ceartainly this architecture support to have multiple
implementations to the same problem side by side.

Best Regards,

Tamas


2006/10/23, Stephen Woodbridge <woodbri at swoodbridge.com>:
> Tamas Szekeres wrote:
> > Folks,
> >
> > According to the mapserver 5.0 development plan
> > http://mapserver.gis.umn.edu/development/release_plans/mapserver_5_0
> > we have planned to implement feature cache support for long running
> > processes and query processing. This support will increase the
> > performance of the long running processes by maintaining the features
> > from a previous query in an internal memory cache.
> >
> > The first step to implement this feature is to provide a framework to
> > modify the behaviour of the  existing providers in an unified manner.
> > The changes described in RFC 22 will address this issue.
> >
> > http://mapserver.gis.umn.edu/development/rfc/ms-rfc-22
> >
> > Any comments and suggestions will be appreciated.
> >
> > Best Regards,
> >
> > Tamas
>
> Tamas,
>
> This is a great writeup. It is very clear and easy to follow.
>
> Have you thought about the caching mechanism at all? I would like to
> suggest that you look at memcached. This is a very simple memory based
> caching mechanism that is key=value driven and uses a least recently
> used flushing along with other methods of expiring cache items. You can
> open a socket connection to a pool of memcached servers, and the api
> handles the rest. We you md5 digest hashes of the request for the keys
> which works very nicely with complex requests like xml, perl structures,
> SQL queries etc.
>
> This could be configured to get from the cache or make the mapserver
> query and store the results to the cache.
>
> There are a lot of large sites using this to cache sessions and/or
> database queries with great results, there is an active list for support
> and fixes and it is an OpenSource project.
>
> Anyway, I'm associated with them, but please look it over if you are not
> already familiar with it.
>
> -Steve W.
>