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From Simon Nash <n...@apache.org>
Subject Re: Dynamic service references ?
Date Wed, 23 Nov 2011 13:58:30 GMT
Simon Nash wrote:
> Millies, Sebastian wrote:
>>> -----Original Message-----
>>> From: Simon Nash [mailto:nash@apache.org]
>>> Sent: Monday, November 21, 2011 7:42 PM
>>> To: user@tuscany.apache.org
>>> Subject: Re: Dynamic service references ?
>> [snip]
>>> Thanks for confirming this.  That's actually a more serious problem
>>> because it violates the SCA specification requirement that service
>>> references must support Java serialization and deserialization.
>>> Please can you create a JIRA for this and if possible attach a
>>> test case that shows the problem.  If this isn't practical because
>>> the problem only shows up when you're using SAP as the server, please
>>> include all the client-side information including the composites and
>>> bindings for the service reference.  Please also include the XML string
>>> that's produced when you serialize the service reference to XML.
>>> I know very little about how authentication works, but I'll see if
>>> I can spot anything when I see the additional information.
>>>    Simon
>>>> -- Sebastian
>> Hello Simon,
>> I have not been able to reproduce the original authentication error,
>> but instead get a WSDL generation error even during the 
>> deserialization stage
>> (i. e. before making any service call) because no WSDL definition is 
>> found for
>> the deserialized binding.
>> I attach modified versions of two Tuscany samples. In 
>> helloworld-ws-service-secure
>> I have modified the definitions.xml to use 
>> BasicAuthenticationPolicySet, as in my
>> original setup with SAP. In helloworld-ws-reference-secure I have 
>> split the
>> HelloWorldService interface into a part referring to the external web 
>> service,
>> and a part containing additional methods that attempt the remote call 
>> while
>> first serializing the embedded reference. I have deleted the test class
>> just tested the Socket connection.
>> You can try starting the service component with "ant run" and then 
>> manually
>> starting (no build target) helloworld.HelloWorldClientTestCase in the 
>> client component.
>> This test case contains two new tests, one with "normal" 
>> serialization, one with
>> your coding for explicit XML serialization.
>> I have added some elements to the composite file and some annotations 
>> to the coding
>> (both hopefully redundant) in order to get clearer about the code 
>> structure. (Did I ever
>> mention that I do not like frameworks inferring stuff on their own? 
>> Just too much
>> opportunity for error through oversight, I much prefer saying it all 
>> explicitly.)
>> I'll wait with opening any JIRA for this putative serialization  
>> problem until you
>> have had time to have a look at this.
>> -- Sebastian
>> IDS Scheer Consulting GmbH
>> Geschäftsführer/Managing Directors: Kamyar Niroumand, Ivo Totev
>> Sitz/Registered office: Altenkesseler Straße 17, 66115 Saarbrücken, 
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>> http://www.softwareag.com
> Hi Sebastian,
> Thanks for doing this.  I have reproduced the WSDL problem and I have
> a theory (actually more like a wild guess) as to what may be wrong.
> It will take me a little while to run a build and apply an experimental
> change to see what happens.  I'll keep you posted.
>   Simon
Hi Sebastian,
I'm making fairly good progress with this.  Please can you create a JIRA
to formally document and track this issue, attaching your two zip files
that show the problem.

The deserialization code for service references is missing a few
important pieces.  It does enough to work for the simplest case
of binding.sca with interface.java, but it doesn't work correctly
for binding.ws/wsdlElement or interface.wsdl.  I suspect the same
applies for policies, but I haven't got quite that far yet.

I'm adding the missing pieces one by one.  With each addition I get
further through the invocation code path and discover the next
missing piece.

One change that will be necessary in user code is to change the XML
deserialization call from
   new ServiceReferenceImpl<SomeType>(xmlReader)
   new ServiceReferenceImpl<SomeType>(SomeType.class, xmlReader)

This is necessary for a service reference with interface.wsdl because
there's no other way for the deserialization code to obtain a Java
interface from the WSDL interface in the XML.  It isn't necessary
if the service reference uses interface.java.  It also shouldn't be
necessary when using regular Java serialization/deserialization, as
the service reference can write out the necessary class information
when it's serialized.


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