[seek-dev] Re: [globus-developer] Http-(Get or Post) Binding in gt3 (fwd)

[Jing Tao]

Hi, everyone:

The attached email is a reply one for the http binding in gt3. It seemed 
the globus has some  difficuties to suuport http binding service. Even we 
make up one, but I am not sure the service is a grid service. 

Why do we stick to http binding for "get" method?

In Santa Barbara meeting, Dave and I discuss about the "get" method. He 
suggested we use soap binding for "get" method. The parameter passed to 
"get" method is a identifier and the return value is a url which points 
the file or other resource. After client calls the "get" method and gets the 
url, client then open the url and get content of file or document. It is 
good idea. But this is different to our purpose of "get" method.

Another way is we can use soap binding directly for "get", the 
wsdl will look like:

<message name="getRequest">
  <part name="identifier" type="xsd:string"/>
</message>
<message name="getResponse">
  <part name="parameter" type="xsd:base64Binary"/>
</message>
<portType name="EcogridSoapPortType">
	<operation name="get">
	   <input message="tns:getRequest"/>
	   <output message="tns:getResponse"/>
     	</operation>
</portType> 

base64Binary will be used as return type. Using this interface, 
we can directly get the data we want. The issue now I can imagine is 
maybe srb has very big image file and the process will take long time.

Any comment, suggestion will be appreciated!

Jing

-- 
Jing Tao
National Center for Ecological
Analysis and Synthesis (NCEAS)
735 State St. Suite 204
Santa Barbara, CA 93101

---------- Forwarded message ----------
Date: Wed, 29 Oct 2003 11:10:59 +0000 (GMT)
From: Guy Rixon <gtr at ast.cam.ac.uk>
To: Jing Tao <tao at nceas.ucsb.edu>
Cc: developer-discuss at globus.org, discuss at globus.org
Subject: Re: [globus-developer] Http-(Get or Post) Binding in gt3

I don't think the Axis WSDL2Java class can make stubs for an HTTP binding.
I tried this with an earlier version of Axis, back in 2002, and didn't get
anywhere. The build system for grid services in GT3 won't work well for
bindings that WSDL2java doesn't support.

*Hand-waving guess* If you code your own stubs and service skeletons, then you
should be able to have one HTTP-get-bound port in a GT3 service.  You wouldn't
easily be able to re-bind the GridService port to HTTP-get, as the stubs and
skeletons for that are too tied up in the GT3 infrastructure.

Wil O'Mullane tells me that the .NET tools automatically generate HTTP-get
bindings for services, as well as HTTP-SOAP bindings, if you ask the tools to
do this.  I've seen and used examples of web services (but not grid services)
built this way.  You might extend this capability to grid services using one
of the .NET implementations of OGSI.

Wil also suggests that the simplest way to get a HTTP-get interface to a Java
web-service is to put a simple servlet between the web browser and the
HTTP-SOAP service. I've done this for GT3 grid-services and I know that it
works.

Bear in mind that web browsers and similar user-agents don't understand the
semantics of OGSI dynamic services.  Making a HTTP-get interface is only half
a solution.

Cheers,
Guy

On Tue, 28 Oct 2003, Jing Tao wrote:

> Hi, everyone:
>
> I sorry to ask the question again. But nobody answered last time.
>
> I am generating a grid service from a gwsdl file. To one portType in the
> gwsdl file, I want to assign it http binding rather than soap binding. I
> found lots of documentation in gt3 to generate soap binding but nothing about http
> binding. So I am wondering if gt3 support http binding for a portType. If
> it supports, where may I find the document about how to do it.
>
> Thank you!
>
> Jing
>
>

Guy Rixon 				        gtr at ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523