[mapserver-users] How to handle unavailable data source in mapObj layer?

[Anzel, Phil - NRCS, Fort Collins, CO]

Thanks, Cristiano. I’ll experiment with your approach. - Phil

From: Cristiano Sumariva [mailto:sumariva at gmail.com]
Sent: Tuesday, July 31, 2012 1:58 PM
To: Anzel, Phil - NRCS, Fort Collins, CO
Subject: Re: [mapserver-users] How to handle unavailable data source in mapObj layer?

Hum I guess you will need grab each outOfHouseLayer using the map.getLayer method and invoke draw on each layer.
catching the exception. This way you can wait and retry, and give up some layer that did not answered removing it from mapObj.

Split the mapObj into inHouseLayers and in case of failure draw home layers only.
2012/7/31 Anzel, Phil - NRCS, Fort Collins, CO <Phil.Anzel at ftc.usda.gov<mailto:Phil.Anzel at ftc.usda.gov>>
All,

We use MapServer via the SWIG interface for C#, loading a mapfile and rendering it with code similar to:
  mapscript.msLoadMapFromString(mapfile, null);
  imageObj io = mapObject.draw();

Our layers largely draw from database tables, lately we've started consuming remote WMS services and have found that these services are occassionally unavailable (such as reporting a "404" HTTP status). The "draw()" method throws an exception in such a case, reporting within the exception message the failing layer and the status.

Is there a way to change this behavior? We'd like a softer landing: could we define the "must have" layers and allow others to be drawn or skipped based upon data availability. We'd also want to be able to query the mapObj regarding each layer's success or failure.

Can this be done in MapServer 6.1-DEV?

Thanks,

- Phil Anzel, contractor for USDA/NRCS/ITC (Web Soil Survey Team)





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