[OASIS Issue Tracker] Updated: (TOSCA-29) Selection of Node Templates types

[ http://tools.oasis-open.org/issues/browse/TOSCA-29?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul Lipton  updated TOSCA-29:
------------------------------

    Component/s: Spec

> Selection of Node Templates types
> ---------------------------------
>
>                 Key: TOSCA-29
>                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-29
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Improvement
>          Components: Spec
>            Reporter: Derek Palma
>            Assignee: Derek Palma
>
> In certain situations it is desirable to make the selection of the concrete type of a Node Template dependent on the final deployment context. This becomes apparent in selecting scaling/load balancing mechanisms where different clouds might provide varying but suitable implementations of the required functionality or possibly none, requiring the deployment of the components providing this functionality. A ServiceTemplate could represent these functions as well as an actual deployment of an implementation of these functions.
> An abstract type (which never can itself be instantiated) could represent the required functionality. Subtypes could represent concrete implementations. A selection mechanism (based on requirements/capabilities constraints) could be used to determine the final NodeType that should be instantiated. A NodeTemplate with NodeType set to the abstract type could represent this scenario and trigger the necessary selection processing.

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