[ka-Map-users] recent changes in cvs

[Paul Spencer]

Hi Ed,

Good question :)  the answer is that the time-based changes will take  
effect 'immediately' in all currently connected clients because they  
are controlled on a per-layer basis by the client.

The mapfile version change could cause problems if clients are  
connected with one version of the mapfile and the version changes on  
the server.  New clients will cause new tiles to be requested, but  
old clients won't, so there could be a situation where the tiles are  
mismatched.

It may require some tweaking of the logic and determining what the  
best practice is for setting refresh vs redraw timeouts.

Cheers

Paul

On 9-May-06, at 3:09 PM, Ed Cooley wrote:

> Paul,
>
> I am assuming these changes work at the layer level and are server  
> centric
> so when the timeout occurs all cached tiles are invalidated and any  
> new
> tiles are cached until the timeout expires again.
>
> For example:  if you have many clients requesting they all expire  
> at the
> same time.
>
> Ed
>
> ---
> Ed Cooley
> Strategy Systems, Inc.
> 479-271-7400 - Fax: 271-7401
> http://www.strategysystems.com/
>
>
> -----Original Message-----
> From: ka-map-users-bounces at lists.maptools.org
> [mailto:ka-map-users-bounces at lists.maptools.org] On Behalf Of Paul  
> Spencer
> Sent: Tuesday, May 09, 2006 1:40 PM
> To: ka-map-users at lists.maptools.org
> Subject: [ka-Map-users] recent changes in cvs
>
> All,
>
> I though I would just let everyone know that I have committed changes
> in cvs to add versioning support in a couple of ways.
>
> First, you can now add a 'version' metadata in the web object of your
> map file.  This version, if present, is included in tile requests.
> The version used to create any tile is stored with the tiles.  When
> the version in the mapfile changes, the tiles are automatically re-
> requested by the client (because the url changes) and are regenerated
> in the cache on the server without needing to delete the cache.
>
> Second, you can now specify a "redraw_interval" metadata in the
> metadata of a layer.  The redraw_interval is the number of seconds
> that the data for a particular layer/group should be considered
> valid.  When tiles are requested, if the current time is newer than
> the creation time plus this interval, the tiles are recreated.  There
> is a new function in the kaMap _layer API to trigger redrawing in
> this way.
>
> Third, you can now specify a "refresh_interval" metadata in the
> metadata of a layer.  This is used to get kaMap to automatically
> redraw a layer after the number of seconds in this field pass.  This
> is intended to be used with layers that have a tile_source of redraw
> (and a redraw_interval) or nocache.
>
> Note this won't work with precache2.php yet.  I'll follow up with Tim
> to get that updated.
>
> Cheers
>
> Paul
> +-----------------------------------------------------------------+
> |Paul Spencer                           pspencer at dmsolutions.ca   |
> +-----------------------------------------------------------------+
> |Applications & Software Development                              |
> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
> +-----------------------------------------------------------------+
>
>
>
>
> _______________________________________________
> ka-Map-users mailing list
> ka-Map-users at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/ka-map-users
>

+-----------------------------------------------------------------+
|Paul Spencer                           pspencer at dmsolutions.ca   |
+-----------------------------------------------------------------+
|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
+-----------------------------------------------------------------+