Re: [sca-assembly] Issue 227: what does promotion of channels mean wrt intents/policies

[Eric Johnson <eric@tibco.com>]

Hi Anish,

Am I missing something here?

I don't see how this is any different from a service or reference that is promoted to the boundaries of a containing composite.

For that matter, the current eventing proposal promotes consumers and providers, and those in turn could be promoted to the boundary of the next containing composite.  The *only* difference I see is that my proposal leaves open the possibility that consumers and providers would be subject to the same policies set in the same place - for example an expectation of "confidentiality" set on a channel - and that seems more appropriate to me.

In any case, I don't see why you perceive that this question around policies is specific to channels.

Eric.

On Jun 8, 2010, at 8:24 AM, Anish Karmarkar wrote:

> One of the things that has been proposed by Eric is promotion of channels outside of a composite. I'm assuming that such promotions will allow for intents/policies to be added on promoted channels by composites at higher levels. I'm not sure what that means to consumers/subscribers that are deeper down in the hierarchy.
> 
> I imagine that channel policies/intents will impact all the consumers/producers connected to it. When a channel is promoted with additional/different intents/policies on it, what happens to consumers/producers that are connected to the same channel at a lower level. Are they affected by the additional intents/policies? If they are that would be very counter-intuitive. If they are not affected, is it still the same channel? For example, if it is a JMS topic, it is going to be the same topic for the consumers/producers at all levels. The topic has to be created with particular guarantees/persistence that are going to affect all consumers/producers. This changes the intent model. The intents would now flow up *and* down the hierarchy.
> 
> -Anish
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