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.. This work is licensed under a Creative Commons Attribution 4.0
.. International License. http://creativecommons.org/licenses/by/4.0
.. Copyright (C) 2019 IBM.
Workflow
========
A workflow defines an overall action to be taken on the service, hence is an entry-point for the run-time execution of the CBA package.
A workflow also defines inputs and outputs that will defined the payload contract of the request and response (see Dynamic API)
A workflow can be composed of one or multiple sub-actions to execute.
A CBA package can have as many workflows as needed.
Single action
-------------
The workflow is directly backed by a node_template of type tosca.nodes.Component
Multiple sub-actions
--------------------
The workflow is backed by Directed Graph engine, node_template of type dg-generic, and are imperative workflows.
A DG used as workflow for CDS is composed of multiple execute nodes; each individual execute node refers to a plugin, that is a node_template of type tosca.nodes.Component.
Below the properties of a workflow:
Workflow Example
----------------
.. code:: json
print("
{
"workflow": {
"resource-assignment": { <- workflow-name
"inputs": {
"vnf-id": { <- static inputs
"required": true,
"type": "string"
},
"resource-assignment-properties": { <- dynamic inputs
"required": true,
"type": "dt-resource-assignment-properties"
}
},
"steps": {
"call-resource-assignment": { <- step-name
"description": "Resource Assignment Workflow",
"target": "resource-assignment-process" <- node_template targeted by the step
}
},
"outputs": {
"template-properties": { <- output
"type": "json", <- complex type
"value": {
"get_attribute": [ <- uses expression to retrieve attribute from context
"resource-assignment",
"assignment-params"
]
}
}
}
}
}
}
")
TOSCA definition: http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454203
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