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Subject: [OASIS Issue Tracker] Commented: (TOSCA-4) Modification of the <Interfaces> element of Node Types
[ http://tools.oasis-open.org/issues/browse/TOSCA-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=29669#action_29669 ]
Frank Leymann commented on TOSCA-4:
------------------------------------
General comment on Ad "Derek 01/Mar/12":
One might think about inventing a mechanism that allows to refer to super types only (JEE_AS instead of Ven1_AS or Ven2_AS) and let "the system" find out at runtime what the appropriate implementation is. But vendor specifc implementations typically have different dependencies, for example: Ven1_AS may work well with VenX_DB and VenY_DB, while Ven2_AS works only with VenA_DB. Such dependencies would have to be defined/declared by "some means", i.e. they have to be made explicit. One way of making such dependencies explicit in a portable manner is by rendering them in plans.
Again, vendors might differentiate themselves by fancy tools that generate topology templates and plans from very special representations that are proprietary. The generated service definition can then be moved into any TOSCA compliant environment. But again, this is my very personal view...
> Modification of the <Interfaces> element of Node Types
> ------------------------------------------------------
>
> Key: TOSCA-4
> URL: http://tools.oasis-open.org/issues/browse/TOSCA-4
> Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
> Issue Type: Bug
> Components: Spec
> Reporter: Frank Leymann
> Assignee: Frank Leymann
> Priority: Critical
>
> We propose to drop the <Interfaces> element of node types and support (at most) a single <Interface> for a <NodeType> element. This interface will consist of one of more operations. The implication is that the current <Operation> element must be renamed to better reflect its purpose; because its purpose is to define scripts as operations of node types, we propose to rename todays <Operation> into <ScriptOperation>. As a result of the renaming, an <Interface> consists of <Operation>s that may be either an operation of a port type (i.e. a WSDL operation), a REST API, or a script operation.
> The current <REST> element does not suffice to support the variety of REST APIs found in the industry. The proposal is to extend the current definition accordingly. Beside allowing to define the HTTP method to be used, both, abs_path and absolte_URI variants of request URIs must be supported. The optional body of the request message and the response message must be specifiable. Next, a pure URI variant of passing parameters must be supported, i.e. the new syntax must support to define a URI query string. Also, key HTTP header fields that are relevant for the request must be specifiable.
> Finally, not only script-based operations require implementation artifacts. For example, a REST API may be represented by a WAR file implementing the REST API. This implies to factor out the corresponding <ImplementationArtifacts> element into the embracing (new) <Operation> element.
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