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From David Jencks <djen...@gluecode.com>
Subject Re: Axis module review
Date Thu, 04 Nov 2004 04:50:39 GMT
I am looking forward to looking at the new code very much and hope that 
I can quickly finish up what I've been working on so I can concentrate 
on the new code properly.

Many thanks,

david jencks

On Nov 3, 2004, at 8:39 PM, Srinath Perera wrote:

> Hi All;
>
> As I promise I have send a patch that fix the basic problems
> (hardcoded obj names ..ect ) in the Axis geronimo module and get the
> POJO case up and runing :).
>
> The patch is checked  in; I am looking foward to the comments to know
> am I heading in the right direction. (I am busy with a exam and might
> not write codes for about two weeks on the module.) but I will be
> online and will happy if I can communicate in the mean time and
> understand the expectation of the EWS from the Geronimo point of view
> throughly.
>
> Thanks
> Srinath
>
>
>
> On Fri, 29 Oct 2004 15:17:14 +0600, Srinath Perera 
> <hemapani@gmail.com> wrote:
>> Thanks everybody for the help :) :)... I think I got the big picure
>> and hopfully should be able to get the Web Services working(which do
>> not have EJB) behind them with out kernel. (There is a classloader
>> issue when the EJB involved. I will try to get the code up removing
>> all referances to kernel for POJO based WS.)
>>
>> I think over all the stuff over the weekend get back. My view about
>> the Web Service is follows. There are two types of web services
>> A) EJB based
>> B) POJO based (servlet based one .. actually both has a servlet at the
>> front so I dont see any sense in the name "Servlet based" : ) )
>>
>> Web Service(HTTP one we concern about) is a Servlet that accepts SOAP
>> over HTTP. Axis basically
>> 1) get the request XML (SOAP) and converts them to the java objects
>> 2) call the java class (POJO) or EJB that provide the implementation
>> 3) get what ever the result and send them back as SOAP
>>
>> Only deferance between the EJB based and  POJO based one is
>> 1) Axis call a EJB instead of POJO at step #2
>> 2) We have to make sure EJB is up when the webservice is called
>>
>> I think we should be able to do it with one WSBuilder. To be the steps
>> is like follows
>> 1. Geronimo Deployer find that the WAR/EAR is a ws module by looking
>> at exsistance of the webservices.xml file in the module
>> 2. The WSBuilder will create the confiuration and start it
>>     a. there should be a one GBean for each WS (we have to sort out
>> how to do this)
>>     b. there should be a GBean for each EJB that referanced
>> 3. when the confiuration started web services are avalible
>>
>> AxisGBean will keep track of the things and manage Axis
>>
>> Thanks
>> Srinath
>>
>>
>>
>>
>> On Fri, 29 Oct 2004 01:24:19 -0700, David Blevins 
>> <dblevins@gluecode.com> wrote:
>>>
>>> On Oct 28, 2004, at 11:52 PM, David Jencks wrote:
>>>
>>>> My understanding of web services is that messages can be sent to
>>>> either servlets or ejbs.  (Apparently the servlets aren't "Servlet"
>>>> implementations, but are usually wrapped in one).  We need a gbean 
>>>> to
>>>> be deployed for each such servlet and each such ejb.  At the moment 
>>>> I
>>>> think the best approach is to have a WSServletBuilder and a
>>>> WSEJBBuilder that will actually build the gbeans.  These, especially
>>>> the WSEJBBuilder, would be similar to the openejb
>>>> SessionConfigBuilder.
>>>
>>> Not just similar to but the same as--one session bean can have all of
>>> the following interfaces:
>>>    - Local
>>>    - Remote
>>>    - ServiceEndpoint
>>>
>>> All of which can have transaction attributes associated with them.  
>>> The
>>> ServiceEndpoint interface can even be invoked directly by EJBs,
>>> Servlets, or App Clients through declaring it as a service-ref and
>>> looking a it up through JNDI.  Any invocations on the ServiceEndpoint
>>> interface go through JAX-RPC.
>>>
>>> Aside from JAX-RPC/ServiceEndpoint invocations, people can invoke the
>>> session bean through SOAP/WSDL over HTTP or HTTPS.  In this case 
>>> there
>>> is a mapping from WSDL to the ServiceEndpoint interface.
>>>
>>> All in all, this is not very different from the CORBA integration 
>>> which
>>> also supports Java and non-Java clients through IIOP.  In this case 
>>> we
>>> use SOAP instead of IIOP,  ServiceEndpoint/JAX-RPC instead of
>>> Remote/RMI-IIOP, WSDL-to-Java mapping instead of IDL-to-Java mapping,
>>> and Axis instead of an ORB.
>>>
>>> -David
>>>
>>>
>>
>


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