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Subject: NEW ISSUE: Deployment, Redeployment - Granularity and Semantics

Raiser:   Mike Edwards


Discussions at the June 2008 F2F meeting made it clear that the description of Deployment, Redeployment,
the associated granularity and semantics associated with these operations are unclear from the specification
but they are of real concern to both runtime implementers and to developers and deployers of solutions,
since they need to have a good understanding of what will happen.

This emerged particularly from a discussion of deployment actions which cause "rewiring", and how the
Domain configuration is changed when a deployment or redeployment action has the effect of changing
or adding wire targets.  The same can be said for deployment actions which change Domain level
property values.

The SCA Assembly specification needs additional material to describe the effects of deployment and
redeployment and how changes to wiring and to property values are handled.  

There may also be the need to consider a full lifecycle description for SCA components including actions
such as "Start" and "Stop".  The current specification does not say anything about these lifecycle states
but they become important once considering the possibility of dynamic update of wiring and/or property

It is likely that the behaviours described will need to be optional - some runtimes may need to be relatively
static and may not permit dymanic changes at all.  Other runtimes may make a virtue of the capability to
change aspects of the deployed domain at the drop of a hat.


None at this time

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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Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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