Re: [sca-assembly] NEW ISSUE: Provide some way to prevent early binding toglobal domain channels

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

Logged as:  http://www.osoa.org/jira/browse/ASSEMBLY-255

Yours, Mike

Dr Mike Edwards		Mail Point 146, Hursley Park
STSM		Winchester, Hants SO21 2JN
SCA & Services Standards		United Kingdom
Co-Chair OASIS SCA Assembly TC
IBM Software Group
Phone:	+44-1962 818014
Mobile:	+44-7802-467431 (274097)
e-mail:	mike_edwards@uk.ibm.com

From:	Eric Johnson <eric@tibco.com>
To:	OASIS SCA Assembly <sca-assembly@lists.oasis-open.org>
Date:	07/02/2011 20:24
Subject:	[sca-assembly] NEW ISSUE: Provide some way to prevent early binding to global domain channels

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Title:  Provide some way to prevent early binding
to global domain channels

Target: Assembly 1.2 WD 03

Description:

As currently drafted, producers and consumers can indicate global domain
channels in their @source & @target attributes.

In some scenarios, assemblers will want to prevent the use of said 
references to global domain channels.  For example, an 
assembler/deployer may wish to deploy their composite in conjunction 
with an application provided by a 3rd party. Since the third party is 
unlikely to know the details of the target SCA domain, they cannot 
safely reference global domain channels. To that end, the 
assembler/deployer wants to be sure that no such global domain channels
are referenced by accident.

Currently, there's no specified way for the SCA runtime to enforce such
a constraint.

Proposal:

(Broad strokes:) In section 5.11, add an attribute to the 
implementation.composite element called @allowGlobalRefs (defaults to 
true). When this is set to false, any contained use of @source or 
@target that refers to a global domain channel MUST trigger an error 
when contributed to the domain.


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