[Qgis-user] QGIS project slow to open when too much wms layers

[Brent Wood]

Can we assume a WMS service is unchanging? While some may well be, that is not a safe assumption to make, so running through the getcapabilities each time a project is opened seems reasonable.
I'd assume that within a session, once a layer has been successfully accessed & retrieved it is no longer necessary, but a project may not have been opened for months.
A compromise could be, on opening a project with WMS layers, to (optionally) ask the user whether to validate WxS layers before opening them, allowing them to speed up the operation if they so desire. Or to have this as a project setting the user can toggle, but not something that should be disabled permanently.
my 02c...
Brent Wood



      From: Andrea Peri <aperi2007 at gmail.com>
 To: aperi2007 <aperi2007 at gmail.com>; Jürgen E. <jef at norbit.de>; qgis-user <qgis-user at lists.osgeo.org> 
 Sent: Sunday, December 6, 2015 9:34 AM
 Subject: Re: [Qgis-user] QGIS project slow to open when too much wms layers
   
Hi Sandro,

I study better the question and perhas this is more a strange issue.
Infact my doub is why is necessary a getCapability request when open a project ?

The getcapabilities is need for list the layers, choose the style,
choose the srs and retrieve the bounding-box of the layer.
All this action are need only when a new wms layer is to add at the
qgis project.
So these are all do when I open the WMS add layer windows.

But when I open a project where the wms layer are just added why do a
getcapabilites request for every wms layer in it ?

This is the question.

A.


2015-12-05 18:32 GMT+01:00 Sandro Santilli <strk at keybit.net>:
> On Sat, Dec 05, 2015 at 06:06:05PM +0100, aperi2007 wrote:
>
>> https://lists.osgeo.org/pipermail/qgis-user/2015-December/034593.html
>
> [..]
>
>> Insteal the problem is on the getcapabilites requests.
>> They are repeated the same for every single wms layer indipendently
>> if it is coming from the same wms service or not.
>
> [..]
>
>> A good enhancement for me could be to do one single getcapabilities
>> request for every distinct wms service used in the project instead
>> that one for every layer to avoid this waste redundancy of work.
>
> Sounds worth an enhancement ticket.
> A cache for capabilities request.
>
> --strk;



-- 
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù


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