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Subject: [OASIS Issue Tracker] Commented: (TOSCA-115) Requirements Capabilities to provide interfaces
[ http://tools.oasis-open.org/issues/browse/TOSCA-115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36224#action_36224 ]
Kishore Jagannath commented on TOSCA-115:
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The most important use case can attributed to behavioural capabilities by defining capability behaviours and their operations. I do agree that there could be certain issues if we are trying to attribute multiple software capabilities which are interdependant as this would hamper their ability to connect through a relationship. But this is just one of the specific scenario. This scenario exists even if operations are defined directly in my NodeTypes. So in general we should not be modelling two dependant entities as part of a single node type as it would not allow a designer to define relationships. This is not a problem which has been introduced by this proposal but something in general which a TOSCA designer shouldnt be doing
As a designer of a specific Node type requiring a specific capability I get an idea of the underlying operations provided by this capability when I connect the Requirements and Capabilities through relationships. The designer need not bother about the actual NodeType which posses this capability.
> Requirements Capabilities to provide interfaces
> -----------------------------------------------
>
> Key: TOSCA-115
> URL: http://tools.oasis-open.org/issues/browse/TOSCA-115
> Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
> Issue Type: New Feature
> Affects Versions: V1.1_CSD01
> Reporter: Kevin Wilson
>
> Requirements and capabilities should provide specific interface definitions. So that the designer of a app can depend on a contract set of public properties that are to be provided and a contracted set method/interfaces that are provided by the requirement.
> For example:
> If I have a dependency on a DB Server, and need to run SQL on that server, at design time, I would like to know the methods supported by the DBServer requirement so that I can leverage that in my component scripting.
> On the implementation side providing the component, the script/method to execute the script may be different for each DBServer type. IE commands to run SQL on MySQL are not the same commands that would be used for Oracle. However, the SQL may the same in some cases.
> Similar methods/use cases exist for J2EE server deploy methods etc.
> By providing a interface on the Requirement/Capability we can leverage the workflows specific to the capability in a generic way. And the designer would be able to identify the contracted calls that are made available.
> https://www.oasis-open.org/apps/org/workgroup/tosca/document.php?document_id=49635
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