Re: Model intents and policySets attached under elements, was:Re: Transaction policy seed code and questions on the Tuscany policy framework

[Raymond Feng]

More comments inline.

Thanks,
Raymond
----- Original Message ----- 
From: "Jean-Sebastien Delfino" <[EMAIL PROTECTED]>
To: <tuscany-dev@ws.apache.org>
Sent: Monday, October 22, 2007 6:16 PM
Subject: Re: Model intents and policySets attached under 
<implementation.xxx> elements, was:Re: Transaction policy seed code and 
questions on the Tuscany policy framework


[snip]
Raymond Feng wrote:

We can have something like:

Well... You know what I think about how to model the intent -> operations 
relationship :) I think that you should experiment a bit with what you're 
proposing, I'd like to just bring to your attention that:

- modeling operation and service as just strings is not consistent with 
what we're doing elsewhere in the model, and will require lookups all over 
the place

You are right. We should use Operation and Service instead.


- IIRC policies can be associated with operations on services, references, 
callbacks and implementations, component types (and I'm not sure about 
constraining types)


Good catch. I was too focused on the implementation.xxx specific issue. We 
should try to have a model that works with all the cases and combinations.

- policies can also be associated with all operations on an interface, or 
all operations on an implementation


Yes, it's tricky here. The operation-level intents/policySets can be 
attached to different levels in the configuration:

(interface, operation)
(service, operation)
(reference, operation)
(binding, operation)
(implementation, operation)
(implementation, service, operation)

Are you proposing List<Operation> Intent.getOperations() and List<Operation> 
PolicySet.getOperations()?

- you'll need to distinguish between intent attach points and policySet 
attach points


public interface Component extends PolicyAttachPoint {
...
   // List<Intent> getRequiredIntents(); // from PolicyAttachPoint
   // List<PolicySet> getPolicySets(); // from PolicyAttachPoint
   List<OperationPolicyAttachPoint> getOperationPolicyAttachPoints();
}

public interface OperationPolicyAttachPoint extends PolicyAttachPoint {
   String getOperation();
   String getService();
   void setOperation(String operation);
   void setService(String service);
}

Thanks,
Raymond

--
Jean-Sebastien


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