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Subject: RE: [sca-j] NEW ISSUE: Callback Simplification


Luckily, neither CallbackIDs nor CallbackObjects are mentioned in the assembly spec, so we may be able to handle a large part of this simplification project entirely within the Java TC.




From: Mike Edwards [mailto:mike_edwards@uk.ibm.com]
Sent: Wednesday, February 13, 2008 4:31 AM
To: OASIS Java
Subject: Re: [sca-j] NEW ISSUE: Callback Simplification



As you perhaps remember from the Assembly F2F meeting, I'm certainly all in favour of simplification in
the area of callbacks and conversations.

However, this issue being raised in the Java TC raises the question of whether all that is intended is some
tinkering with the Java API for these capabilities, or whether the aim is a more general simplification of
callbacks and conversations.

If a more general reworking is intended, then I think that a parallel issue needs raising in the Assembly TC
since I think that the Assembly TC defines the general concepts that must then be implemented by the
other affected TCs (which include at least the language implementation TCs and the bindings TCs).

Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431  
Email:  mike_edwards@uk.ibm.com

"Michael Rowley" <mrowley@bea.com>

12/02/2008 22:47


"OASIS Java" <sca-j@lists.oasis-open.org>




[sca-j] NEW ISSUE: Callback Simplification




There’s been some informal discussion about the need to simplify callbacks and now some email on the subject.  I’ll suggest this issue to hang this discussion on.  I won’t put in a proposal, since I don’t think we are yet at the stage where it is appropriate to have a proposal stored in the JIRA.
RAISER: Michael Rowley
TARGET: Java API and Annotation Specification
One of SCA’s goals is to present a simple programming model to service developers.  Unfortunately, the current capabilities related to callbacks don’t really qualify as simple.  Developers have to be able to understand all of the possible combinations of:
- The scope of the client (4 possibilities)
- The scope of the service provider (4 more possibilities)
- Conversational or non-conversational on the main interface.
- Conversational or non-conversational on the callback interface.
- User specified callback IDs
- User specified callback objects.
- The relationship of callback IDs to conversation IDs (possibly user specified)
- ...and probably more
Not included.


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