Re: [sca-assembly] ASSEMBLY-136: Promoting a reference with multiplicity 1..nand targetsshould default to 0..n - Updated Proposal

[Mike Edwards <mike_edwards@uk.ibm.com>]

Simon,

This proposal seems simpler to me than
the existing stuff and your proposal.
But perhaps simplicity is in the eye
of the beholder.

I note that the promotion NEVER sets
policy for "internal" wires from a reference.

There are no strange rules relating
to multiplicity when nonOverridable is used.

"Default" reference targets
are natural in this proposal.

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

From:	Simon Nash <oasis@cjnash.com>
To:	Mike Edwards/UK/IBM@IBMGB
Cc:	OASIS Assembly <sca-assembly@lists.oasis-open.org>
Date:	04/08/2009 14:38
Subject:	Re: [sca-assembly]  ASSEMBLY-136: Promoting a reference with multiplicity 1..n and targetsshould default to 0..n - Updated Proposal

---

Mike,
 From a quick read through this summary, it appears that the proposed
semantics are the same as the current spec plus my original proposal
for ASSEMBLY-136, with one important difference.  This difference
is
that it is no longer possible to mark a promoted x..1 reference as
@nonOverridable=true.  This means that it is no longer possible to
use promotion to set policy for "internal only" x..1 references.
Am I correct that this is the only difference in this proposal?

   Simon

Mike Edwards wrote:
> 
> Folks,
> 
> Here is a proposal for Issue 136
> 
> Concepts in the proposal:
> 
> 1) A component reference can explicitly declare as many targets as
are 
> compatible with its multiplicity
> 
> 2) When a component reference is promoted, IF the composite reference(s)
> is configured with at least 1
> target (ie through the component that uses the composite) then the
> composite reference targets OVERRIDE
> the targets declared on the component reference (ie the component
> reference targets are not used)
> 
> 3) When a component reference is promoted, IF the composite reference(s)
> has 0 targets configured
> then any targets declared on the component reference are used (ie
the 
> declared targets act as default targets)
> 
> 4) For x..n component references, it is possible to mark the reference
> @nonOverridable="true".  In this case,
> the set of targets which are used for the reference is the set 
> configured on any composite references which promote
> the reference PLUS the set of targets declared on the reference itself.
> 
> 5) For x..1 component references, @nonOverridable="true"
means that the 
> reference cannot be promoted.
> 
> 6) To set policy (etc) for "internal" references:
> - use intents
> - or attach policySets using ExternalAttachment
> - or attach policySets directly
> (since they can't be configured at all by promotion)
> 
> 7) The default multiplicity of a composite reference is determined
by:
> - the multiplicities of the component references it promotes
> - whether (all) the promoted component references have at least 1
target 
> declared
> 
> with the principle being that the multiplicity must be set to ensure
> that the component references will have
> their multiplicity satisfied - 0..x is allowed for the case where
the 
> component reference is 1..x, if there is
> a target declared on (all) the component references.
> 
> 
> I've done the formal proposal as a marked up version of CD03-Rev2
(all 
> changes were accepted BEFORE
> adding the changes for this proposal)
> 
> 
> http://www.oasis-open.org/apps/org/workgroup/sca-assembly/download.php/33566/sca-assembly-1.1-spec-cd03-Rev2%2BIssue136.pdf
> 
> http://www.oasis-open.org/apps/org/workgroup/sca-assembly/download.php/33565/sca-assembly-1.1-spec-cd03-Rev2%2BIssue136.doc
> 
> 
> 
> 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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number 
> 741598.
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PO6 3AU/
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> 
> 
> 
>

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