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Subject: RE: Edge cases in maps: missing content (empty content)
Hi Chris, thanks a lot for your reply (and no problem at all about not replying earlier)! Regarding your position on
“presence of an operation definition” in a node template, I believe we need to discuss it in ETSI NFV SOL001, and might conclude that we need to fix the specs. Greetings, Gábor From: Chris Lauwers <lauwers@ubicity.com>
Hi Gabor, Apologies for the late reply. I’m not sure there is an “official” OASIS TOSCA position on which of these are valid, but here is my opinion:
That said, I don’t believe that “presence of an operation definition” in a node template should have any meaning associated with it. In particular, I don’t believe that presence of an operation should specify whether
that operation is supported or not. Defining an interface on a node type implies that all operations of that interface are supported by all nodes of that node type. Of course, some operations may not have implementations defined, in which case the operation
becomes a noop. Thanks, Chris From:
tosca@lists.oasis-open.org <tosca@lists.oasis-open.org>
On Behalf Of Marton, Gabor (Nokia - HU/Budapest) Dear TOSCA Experts, as these and similar edge cases are not explicitly controlled by the TOSCA YAML specifications, I am asking for your opinion. Which one(s) of the following cases are valid syntactically? tosca_definitions_version: tosca_simple_yaml_1_2 interface_types: interface_type_1: derived_from: tosca.interfaces.Root operation_1: description: .. node_types: node_type_1: derived_from: tosca.nodes.Root properties: property_1: type: string required: false node_type_2: derived_from: tosca.nodes.Root interfaces: interface_1: type: interface_type_1 topology_template: node_templates: node_template_1_1: type: node_type_1 properties:
# case 1 node_template_1_2: type: node_type_1 properties: {}
# case 2 node_template_2_1: type: node_type_2 interfaces: interface_1: operation_1:
# case 3 node_template_2_2: type: node_type_2 interfaces: interface_1: operation_1: {}
# case 4 data_types: data_type_1: derived_from: tosca.datatypes.Root properties: property_1: type: string default:
# case 5 Cases #1 and #2 are assumed to have the same meaning. Similarly cases #3 and #4. Motivation for cases #3 and #4: indicate availability of lifecycle management operations in VNF descriptors (without specifying further details). In the ETSI NFV SOL001 specification, we have an example like this, basically
case #3 (the scale operation inserted by me here for better clarity): tosca_definitions_version: tosca_simple_yaml_1_2 .. node_types: MyCompany.SunshineDB.1_0.1_0: derived_from: tosca.nodes.nfv.VNF .. topology_template: .. node_templates: SunshineDB: type: MyCompany.SunshineDB.1_0.1_0 .. interfaces: Vnflcm: instantiate: scale: .. Related text in SOL001:
Motivation for the other cases: understand the standpoint, to achieve better compatibility of parsers (better interoperability of products). Best regards, Gábor |
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