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Subject: Re: [sca-assembly] ISSUE 39 (was ISSUE 47:Operation element for Interface)

This callback issue has a similar impact on issue 39 (unfortunately already resolved).  This allows the conversational intent to be applied to an interface.  It does not consider the case where the forward direction is conversational but not the callback, or vice versa.

I believe it is necessary to reopen issue 39 to deal with this (or create a new issue).  Any other insights or opinions would be most welcome.


Simon C. Nash, IBM Distinguished Engineer
Member of the IBM Academy of Technology
Tel. +44-1962-815156  Fax +44-1962-818999

Bryan Aupperle <aupperle@us.ibm.com>

02/06/2008 18:24

[sca-assembly] ISSUE 47:Operation element for Interface

Upon further reflection o this issues, the original proposal is not sufficient.

Suppose a service is bidirectional and both the forward and callback interfaces have a cancel method that need to be denoted as endsConversation in the SCDL.  A single operation child element is not sufficient to handle this case.  We need operation and callbackOperation child elements; each with the name, oneWay and endsConversatioon attributes described in the original proposal.

Note  that I am not suggesting a complete replication of the interface definition,  Only those operations that need the SCA attributes would need to be listed in the SCDL.

When we discussed opening this issues, the question was raised if we could extend the existing operation child element of service and reference instead of adding an operation element to interface.   It seems more natural to me to have operations belong to interfaces.  However, if we go that direction, we still have to address the callback problem above.

Bryan Aupperle, Ph.D.
STSM, WebSphere Enterprise Platform Software Solution Architect
Master Inventor

Research Triangle Park,  NC
+1 919-254-7508 (T/L 444-7508)
Internet Address: aupperle@us.ibm.com

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