Re: [Gwt-openlayers-users] Handling unresponsive server

[Edwin C. <com...@gm...>]

Hi Farrukh,

Setting a timeout on a WMS server from the client doesn't sound to me like
something that will work. It is certainly not a standard WMS parameter.
Outside that, the WMS call could be routed over a proxy that sets it's own
time-outs, so even if the WMS server would allow setting time-outs, a proxy
could still intervene IMHO.

As far as I can tell, the second option would be more interesting to look
at. I know that you can pass an array of url's to optimize tile loading:

http://trac.openlayers.org/wiki/OpenLayersOptimization

I don't know if OL will use the urls that work if others fail. In principle
this is possible because all layers are html img elements at their core and
img elements fire an onload event when the image is downloaded.

http://www.htmlcodetutorial.com/images/_IMG_onLoad.html

Therefore it is possible to track the time from the request to the onload
event, and when it exceeds a certain time limit another url could be tried
for the same picture.

Greetings,
Edwin


2009/3/18 Farrukh Najmi <fa...@we...>

>
> I just spent a few hours tracking down a problem that turned out to be
> an unresponsive WMS server at <http://labs.metacarta.com/wms-c/Basic.py>.
>
> I was wondering if there is a way to set a timeout on WMS server
> connection when doing a "new WMS(...)" call.
> Also is there a way to set a set of alternate WMS servers if the primary
> WMS server fails to respond within a set timeout?
>
> Thanks for any advice.
>
> --
> Regards,
> Farrukh
>
> Web: http://www.wellfleetsoftware.com
>
>
>
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