MapServer Application Design Questions

[Ed McNierney]

Adrian -

 

If you are running a .NET/C# application, that application can - using
ServerXMLHttpRequest calls - make as many requests to a MapServer CGI as
you need to produce a single output page.

 

I am not suggesting that that's the best design for your application.
But you started with a very specific question about thread safety and
we're trying to back up to the broader question of application design
(hence the edit I made to the Subject line), because it seems like
that's what you are trying to accomplish.  If you'd like assistance with
that, then you'll need to really describe your application in detail.
Your last email with lists of layers, etc. was a good description of
your data (although you didn't talk about updates and/or update rates).
But you didn't, for example, describe the situation below.

 

There are many users here with expertise in many different sorts of
MapServer applications.  But we can't help if we only have little bits
of information, and if you only send detailed, specific requests for
"how to do it".  If you can take the time to really describe your
application then you will both be in the best position to get advice
from users on this list and we will be able to best use our time by
providing information that's really useful!

 

-          Ed

 

P.S. It also really helps to include the previous message history in
your replies, so we can all understand the context, and so users who
might now be reading this message (because they didn't know much about
thread safety but know a lot about application design) will know what's
going on - thanks.

 

Ed McNierney

Chief Mapmaker

Demand Media / TopoZone.com

73 Princeton Street, Suite 305

North Chelmsford, MA  01863

Phone: 978-251-4242, Fax: 978-251-1396

ed at topozone.com <mailto:ed at topozone.com> 

 

From: UMN MapServer Developers List [mailto:MAPSERVER-DEV at LISTS.UMN.EDU]
On Behalf Of adrian kruk
Sent: Wednesday, January 23, 2008 3:07 AM
To: MAPSERVER-DEV at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-DEV] Is MapServer Thread-safe?

 

	My first reaction is to wonder why you feel you need MapScript
(which leads to the whole issue of thread safety in the first place).  I
would be inclined to build your application as I have done others, using
the .NET/C# environment to process Web requests and then compute an
appropriate WMS request to render the map image required.  You would use
MapServer in simple CGI/WMS mode, sending HTTP requests for images which
you then retrieve in your C# code and embed in an output page of your
design.


Ok I will give an example of functionality. MapScript has map object,
shape object, layer object, etc. With using these, it is simple to run
query in one layer, get results as shapes and then run query on
different layer, create new layer, then get image, i can store map
object in application cache in very simple way, etc, etc. 
It is possible in CGI/WMS? If it is tell me how to do it.





 

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