Re: [sca-assembly] [Issue 253]: (1.2) Must a global domain channel bedeployed before it can be used?

Eric,

I think that the issue contained in
ASSEMBLY-257 is pretty well orthogonal to the discussion of ASSEMBLY-253.

Whether the channel definition is in
a composite file or is contained within a definitions.xml file does not
change the

potential for the channel to be in a
separate contribution from some or all of its "using" producers
and consumers.

It is this which leads to the sequence
question and the problem with auto-deploy.

Yours, Mike

Dr Mike Edwards
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From:
Eric Johnson <>

To:
Danny van der Rijn <>

Cc:
Mike Edwards/UK/IBM@IBMGB, 

Date:
23/02/2011 05:47

Subject:
Re: [sca-assembly] [Issue 253]: (1.2)
Must a global domain channel be deployed before it can be used?

Hi Mike,

On 2/18/11 11:06 AM, Danny van der Rijn wrote: 

<vdR2>

I agree that mechanically there is little difference between an unsatisfied
reference and an unsatisfied GDC.  Semantically, however, there is
quite a difference.  In order to mechanically satisfy the unsatisfied
GDC (albeit minimally) all that is required is a name, and the name is
known exactly by the unsatisfied use of the GDC.  Therefore the runtime
already has enough information to head off the error.  Not so in the
case of an unsatisfied reference.

</vdR2>

<mje> 

Thank you for putting it so clearly. 

My concerns with auto-creation surround this possibility of deployment
taking place as a series of steps, rather than as a "single big bang"
- and with the question of what happens at the completion of each step.

I am concerned with the case where the Domain level channel is there *somewhere*
in the deployed contributions but where it has not yet been deployed.  Allowing
auto-creation in these circumstances is problematic, if auto-creation occurs
before the deployment of the Domain level channel.

</mje> 

At least for this point, this is one of the reasons that
I filed

http://osoa.org/jira/browse/ASSEMBLY-257

If this matters to you, perhaps we should address the question of how they're
deployed before worrying about whether they can be auto-deployed?

-Eric.

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