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Subject: Issue - R45 - BPEL partner link assignments (revisit issue R13)
This issue has been added to the wsbpel issue list with a status of "received". The status will be changed to "open" if a motion to open the issue is proposed and that motion is approved by the TC. A motion could also be proposed to close it without further consideration. Otherwise it will remain as "received".
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Consider the same use case as in the original email exchange:
1. Receive PartnerLinkA, Operation1, messageExchange=First 2. Receive PartnerLinkA, Operation1, messageExchange=Second... some work (a) ...
3. Reply PartnerLinkA, Operation1, messageExchange=First 4. Reply PartnerLinkA, Operation1, messageExchange=Second
... some work (b) ...
In the original issue, there was an implied assumption that any reference to the partner link EPR relies on some engine capability - and mandates some transport specific behavior.
While this is true, there should be a portable way of representing a simple behavior such as logging the source of the request - in a generic way (using an serf for example) - without any reliance on a particular transport or its capability. For example, the service ref might encode the TCP connection information (the 5 tuple) or the WSA address or any other identity the engine supports.
There are 2 areas not defined by the spec which would make this use case, and other's like it, non-portable:
The 2 points above suggest that for portability of BPEL processes,
message exchange attribute should be included on the partner link form
of Assign. The same considerations apply to Invoke activities.
Submitter's proposal:
The requested changes are:
Note that the above changes do not impose any new demands on an engine -
they require the engine maintain some identity for the originator of a
message, but does not impose any semantics on it. In fact, service-ref
already defines a container for such identities.
Changes: 23 Jan 2007 - new issue
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