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Subject: [OASIS Issue Tracker] Commented: (TOSCA-18) Resource Requirements and Capabilities in TOSCA

    [ http://tools.oasis-open.org/issues/browse/TOSCA-18?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=30861#action_30861 ] 

Thomas Spatzier  commented on TOSCA-18:

Hi Keven, interesting thought. However, we have something in the spec already that could probably cover this. Can you have a look and think about whether the following could work?

Recently, we introduced <SourceInterfaces> and <TargetInterfaces> for RelationshipTypes. The idea is that you can define specific RelationshipTypes for specific endpoints, where the relationships bring along the implementation of operations that are needed for establishing the relationship between the two connected endpoints (i.e. kind of connector capabilities of relationship).
Since you can specific a <ValidSource> and <ValidTarget> on RelationshipTypes, you can explicitly defined for which kinds of nodes the relationship can be used and thus operations would work.
So for your example, instead of using the generic "hostedOn" relationship, you could define concrete "WebappHostedOnApache" or "WebappHostedOnJboss" RelationshipTypes that provide the required logic.
The advantage of that approach is that you can connect any pair of nodes by "just" defining a new RelationshipType ("connector") instead of having to modify the endpoints for each new pair.


> Resource Requirements and Capabilities in TOSCA
> -----------------------------------------------
>                 Key: TOSCA-18
>                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-18
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Improvement
>    Affects Versions: CSD03
>            Reporter: Paul Lipton 
>            Assignee: Douglas Neuse
>             Fix For: CSD03
> How will TOSCA enable the specification of resource requirements to enable performance modeling of TOSCA-described entities.  Performance modeling - to some degree - will be necessary to ensure that those entities, once deployed, will be able to meet SLA and similar performance requirements. What is the relationship? 

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