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

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

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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