[Geoserver-devel] the ows architectural in geoserver

maven_apache · December 9, 2009, 2:48am

Hi;
I want to know the architectural of the ows (such as wcs wms),that’s to say how to integrate them to the geoserver,and I follow the docs in the geoserver website:
http://docs.geoserver.org/2.0.x/en/developer/programming-guide/ows-services/index.html

But it has no contents.
In my opinion each ows should own a service something like “wcsServlet, wmsServer…” to handle the request from the client side,however I have not found any servlets in the wcs or wms module, also not in the wps module.

I know geoserver use spring as the ioc container which make it a little hard for my understanding. I appreciate some one can tell me the work flow of a ows, about how to receive the original request, how to dispatch ,handle it?
Since I have a ows (SOS) already, I try to add it to the geoserver,
Looking forward for reply.
Thanks.

maven_apache · December 9, 2009, 6:11am

Nobody at line?

2009/12/9 maven apache <apachemaven0@…403…>

Hi;
I want to know the architectural of the ows (such as wcs wms),that’s to say how to integrate them to the geoserver,and I follow the docs in the geoserver website:
http://docs.geoserver.org/2.0.x/en/developer/programming-guide/ows-services/index.html

But it has no contents.
In my opinion each ows should own a service something like “wcsServlet, wmsServer…” to handle the request from the client side,however I have not found any servlets in the wcs or wms module, also not in the wps module.

I know geoserver use spring as the ioc container which make it a little hard for my understanding. I appreciate some one can tell me the work flow of a ows, about how to receive the original request, how to dispatch ,handle it?
Since I have a ows (SOS) already, I try to add it to the geoserver,
Looking forward for reply.
Thanks.

jive · December 9, 2009, 7:52am

So you have a name? We like to be social around here …

You will find that geoserver has a dispatcher and a framework in the support of OGC style services. Have a look through the hello world tutorial (and the rest of the developers guide). You will find that requests are parsed into objects (which are then passed into the code that processes them - called a Response). Some responses (like those for WMS) have multiple back ends capable of different output formats.

Regards,
Jody

On 09/12/2009, at 1:48 PM, maven apache wrote:

Hi;
I want to know the architectural of the ows (such as wcs wms),that’s to say how to integrate them to the geoserver,and I follow the docs in the geoserver website:
http://docs.geoserver.org/2.0.x/en/developer/programming-guide/ows-services/index.html

But it has no contents.
In my opinion each ows should own a service something like “wcsServlet, wmsServer…” to handle the request from the client side,however I have not found any servlets in the wcs or wms module, also not in the wps module.

I know geoserver use spring as the ioc container which make it a little hard for my understanding. I appreciate some one can tell me the work flow of a ows, about how to receive the original request, how to dispatch ,handle it?
Since I have a ows (SOS) already, I try to add it to the geoserver,
Looking forward for reply.
Thanks.

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maven_apache · December 9, 2009, 8:40am

2009/12/9 Jody Garnett <jody.garnett@anonymised.com>

So you have a name? We like to be social around here …

You will find that geoserver has a dispatcher and a framework in the support of OGC style services. Have a look through the hello world tutorial (and the rest of the developers guide). You will find that requests are parsed into objects (which are then passed into the code that processes them - called a Response). Some responses (like those for WMS) have multiple back ends capable of different output formats.

Sorry,You can call me JianFeng Zhang, I am a Chinese.
To this topic:
I have seen the helloworld example,is it under version 2.0?

What confusing me is the request dispatch:
Take the wcs for example, I found a AbstactControl in org.geoserver.ows.Dispatcher,is it the front controller for all the ows request?
However I do not find the code judging the request type, in my opinion it should have some codes like the following:

String serviceType=Request.getParameter(“service”)…
if(serviceType.equals(“WCS”)}
// do the logic…
}

So how does geoserver dispatch the request?

Also I found the wcs,wms,wps extend a AbstactService,and the related modules contains some KVPReaders,…
For my case, I have a SOS service already, which contains a servlet named SOSServlet to handle the request and return a response,I wonder if I can add it to geoserver by dispatch the request to the SOSServlet?

Regards,
Jody

On 09/12/2009, at 1:48 PM, maven apache wrote:

Hi;
I want to know the architectural of the ows (such as wcs wms),that’s to say how to integrate them to the geoserver,and I follow the docs in the geoserver website:
http://docs.geoserver.org/2.0.x/en/developer/programming-guide/ows-services/index.html

But it has no contents.
In my opinion each ows should own a service something like “wcsServlet, wmsServer…” to handle the request from the client side,however I have not found any servlets in the wcs or wms module, also not in the wps module.

I know geoserver use spring as the ioc container which make it a little hard for my understanding. I appreciate some one can tell me the work flow of a ows, about how to receive the original request, how to dispatch ,handle it?
Since I have a ows (SOS) already, I try to add it to the geoserver,
Looking forward for reply.
Thanks.

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Get the facts.
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Justin_Deoliveira · December 9, 2009, 2:01pm

The GeoServer dispatch system is based on a combination of reflection and spring. If you look for the classes WebFeatureService, WebMapService, and WebCoverageService you will see methods for each of the ows operations. You will also find spring bean declrations of the class org.geoserver.ows.Service which reference them.

This plugin is out of date but gives the general overview of how it works:

http://geoserver.org/display/GEOSDOC/3+A+Simple+PlugIn

And a working version of it is in svn:

http://svn.codehaus.org/geoserver/branches/2.0.x/src/community/hello/

If you are interested in contributing your code we can give you a community module, and i can put together the basic class for you to do the dispatch. Let me know.

-Justin

maven apache wrote:

2009/12/9 Jody Garnett <jody.garnett@anonymised.com <mailto:jody.garnett@anonymised.com>>

    So you have a name? We like to be social around here ....

    You will find that geoserver has a dispatcher and a framework in the
    support of OGC style services. Have a look through the hello world
    tutorial (and the rest of the developers guide). You will find that
    requests are parsed into objects (which are then passed into the
    code that processes them - called a Response). Some responses (like
    those for WMS) have multiple back ends capable of different output
    formats.

Sorry,You can call me JianFeng Zhang, I am a Chinese. To this topic:
I have seen the helloworld example,is it under version 2.0?

What confusing me is the request dispatch:
Take the wcs for example, I found a AbstactControl in org.geoserver.ows.Dispatcher,is it the front controller for all the ows request?
However I do not find the code judging the request type, in my opinion it should have some codes like the following:
-----------
String serviceType=Request.getParameter("service").......
if(serviceType.equals("WCS")}
// do the logic.....
}
-----------------------
So how does geoserver dispatch the request?

Also I found the wcs,wms,wps extend a AbstactService,and the related modules contains some KVPReaders,.....
For my case, I have a SOS service already, which contains a servlet named SOSServlet to handle the request and return a response,I wonder if I can add it to geoserver by dispatch the request to the SOSServlet?

    Regards,
    Jody

    On 09/12/2009, at 1:48 PM, maven apache wrote:

    Hi;
    I want to know the architectural of the ows (such as wcs
    wms),that's to say how to integrate them to the geoserver,and I
    follow the docs in the geoserver website:
    http://docs.geoserver.org/2.0.x/en/developer/programming-guide/ows-services/index.html
    But it has no contents.
    In my opinion each ows should own a service something like
    "wcsServlet, wmsServer...." to handle the request from the client
    side,however I have not found any servlets in the wcs or wms
    module, also not in the wps module.

    I know geoserver use spring as the ioc container which make it a
    little hard for my understanding. I appreciate some one can tell
    me the work flow of a ows, about how to receive
    the original request, how to dispatch ,handle it? Since I have a ows (SOS) already, I try to add it to the geoserver,
    Looking forward for reply.
    Thanks.
    ------------------------------------------------------------------------------
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

[Geoserver-devel] the ows architectural in geoserver

What confusing me is the request dispatch: Take the wcs for example, I found a AbstactControl in org.geoserver.ows.Dispatcher,is it the front controller for all the ows request? However I do not find the code judging the request type, in my opinion it should have some codes like the following:

String serviceType=Request.getParameter(“service”)… if(serviceType.equals(“WCS”)} // do the logic… }

What confusing me is the request dispatch:
Take the wcs for example, I found a AbstactControl in org.geoserver.ows.Dispatcher,is it the front controller for all the ows request?
However I do not find the code judging the request type, in my opinion it should have some codes like the following:

String serviceType=Request.getParameter(“service”)…
if(serviceType.equals(“WCS”)}
// do the logic…
}