Title: Message
Jim,
This was discussed
in Issue 118 and Issue 122, and resolved in Issue 122.
Ugo
-----Original Message-----
From: Jim Clune
[mailto:]
Sent: Monday, December 13, 2004 12:59
PM
To:
Subject: [wsbpel]
Assumptions about WSDL 1.1 MEPs
I am wondering if the current BPEL draft is
making an incorrect assumption about WSDL 1.1 MEPs. The assumption that
the spec seems to make is that a WSDL operation with
Request/Response MEP will necessarily have the request and response in the
same network connection, regardless of the binding. My questions
are:
1. Is the spec making this assumption? (I think
it is.)
2. Is this assumption correct? (I think it is
not.)
My reading this assumption in to the spec comes
largely from Section 6.5. The current draft contains the following
paragraph, where I interpret "synchronous" to mean "in the same network
connection":
The example makes the implicit assumption that
the customer request can be processed in a reasonable amount of time,
justifying the requirement that the invoker wait for a synchronous response
(because this service is offered as a request-response operation). When that
assumption does not hold, the interaction with the customer is better modeled
as a pair of asynchronous message exchanges. In that case, the
"sendPurchaseOrder" operation is a one-way operation and the asynchronous
response is sent by invoking a second one-way operation on a customer
"callback" interface. In addition to changing the signature of
"sendPurchaseOrder" and defining a new portType to represent the customer
callback interface, two modifications need to be made in the preceding example
to support an asynchronous response to the customer. First, the partner link
type "purchasingLT" that represents the process-customer connection needs to
include a second role ("customer") listing the customer callback portType.
Second, the <reply> activity in the process needs to be replaced by an
<invoke> on the customer callback operation.
I don't think you can correctly infer whether or
not a request/response pair will be on a single network connection based
solely on an abstract WSDL. If I'm either
misreading the spec or misunderstanding WSDL, could someone clarify this for me? If not, I'll submit this as an issue
to be resolved. Thanks.
Jim Clune
Parasoft
Corporation email:
101 E.
Huntington Ave. voice: (626)
256-3680
Monrovia, CA.
91016 fax :
(626) 256-6884
