[Qgis-developer] QGIS Server FCGI: retained data / deferred freeing of resources between requests

[Rob Marjot]

Hi list,

Thanks Alessandro. Indeed, I started looking in to the source. It made me
wonder: how does a QGIS Server fcgi instance go about varying MAP=...
parameters in subsequent requests?

>From source it seems to me that the QgsProject object is retained across
the handling of requests (by its fcgi loop). Yet: how about requests coming
in that pass different "MAP=" parameters, selecting different .qgs files?

Thanks
Rob


On Jan 9, 2017 08:48, "Alessandro Pasotti" <apasotti at gmail.com> wrote:

Hi,

QGIS Server is being deeply refactored, and the new implementation is
described in https://github.com/qgis/QGIS-Enhancement-Proposals/issues/74

and: https://github.com/qgis/QGIS/pull/3866

The current implementation has some limited caching of the capabilities
(taken from the project .qgs file).

Note that with some performance degradation you can still run the server as
plain old CGI.

AFAIK there are no documents about the implemementation: follow the source
Luke :)


Cheers.



On Mon, Jan 9, 2017 at 1:11 AM, Rob Marjot <robmarjot at gmail.com> wrote:

> Dear list,
>
> I am currently evaluating QGIS Server as rendering backend for my new
> project; can you give me some insight in the architecture / implementation?
> To pose my question more specific: with QGIS Server being a fcgi
> application, what data (e.g. parsed .qgs file?) is retained and/or freeing
> of resources is deferred between requests?
>
> Much appreciated if any of you can shed a bit of light to the
> implementation details of QGIS Server. Possibly there is technical
> documentation available online?
>
> Thanks
> Rob
>
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-- 
Alessandro Pasotti
w3:   www.itopen.it
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