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Subject: [NEW ISSUE] SCA Assembly requires an Annotation to indicate whether aforward operation in a bidirectional interface must carry a callbackaddress

Raiser:                Mike Edwards

Target:                SCA Assembly specification


In discussions in the SCA-J TC relating to bidirectional interfaces and callbacks, it was noted that in a bidirectional interface, not
all the forward operations necessarily involve their being any related callback operations.  For forward operations with no related
callback operations, it is noted that the implementation expense of transmitting a callback address with the forward request cannot
be avoided at present, since there is no way for an SCA runtime to know that the forward call does not involve any callbacks.  It is
worth avoiding sending the callback address if possible since there is likely to be a significant overhead in generating, transmitting
and interpreting the callback address.

This issue requests that an additional interface annotation is made available by SCA which can be used to mark a forward call
operation as not involving any callback operations, so permitting the SCA runtime to optimise transmission of callback addresses.


None at present

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

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