Hi, Murali,
I'll try to answer your questions.
1) What is relationship-list, and how does it allow us to add a new
service w/ as little coding as possible
The parent-child containment is defined in the OXM schema and in DbEdgeRules -
DbEdgeRules defines additional "cousin" edges, which allows arbitrary nodes in
the graphdb to be connected together in whatever ways the service designers
decide.
2) What is the Model definition stored in AAI from SDC?.Does it store
anything for vFW usecase?
vFW does not have any AAI assets ?
The model loader takes model definitions from SDC and populates objects in the
A&AI graphdb under aai/vX/service-design-and-creation/models
2.1) How this generic structures are used to store Model from SDC?
If in your instance of ONAP there is a vFW service defined in SDC, a
corresponding model will be present under
/aai/vX/service-design-and-creation/models/model/{model-invariant-id} with the
specific version of that model defined in
/aai/vX/service-design-and-creation/models/model/{model-invariant-id}/model-vers/model-ver/{model-version-id}.
Under the model-ver object there will be model-element objects and other
attributes that determine what happens when the model is used in a query.
Additionally, the model/model-ver objects are used to enforce the presence of
model-invariant-id and model-version-id attributes with corresponding
model/model-ver objects defined in the graphdb when adding certain node-types
(you can see which ones by looking at the a&ai oxm). Model queries will look
at those model and model-ver objects to determine what should be returned to
the user, and will use the framework of the model to string together the set of
widget instances, starting from the object or objects in the instance-filter
and traversing the graph following edges as defined in the model.
2.2) What does "Models captures model definitions (subgraph definitions using
the AAI widgets)" mean?
The subgraph is that set of objects that will be returned when using the model
query or another query method that is model aware. A widget model is most
basic type of model in A&AI - it does not contain model-elements, it simply
points at an object type - for example, a service-instance or a generic-vnf or
a tenant. When a model is being used in query, the model processor will look
first at the "startsWith" model element, and then try to find an object of that
type based on the instance-filter. So, if I pass in my instance filter a
service-instance, the model processor will look for a service-instance object
with the given parameters. If it finds a matching service-instance, the model
processor will look for child model-element objects that are contained in the
startsWith model-element, determine the type of the model contained in the
model-element, and then traverse the graph according to the instruction in the
model-element. So if the startsWith model-element contained a model-element
that had a relationship (cousin edge) to a widget model for generic-vnf, the
model processor would then look for generic-vnf objects that have a
relationship to the startsWith service-instance vertex. The model processor
proceeds from there, iterating through the model and then traversing the graph
according what is defined in the model.
As far as a discussion group specific to A&AI, I don't think there is currently
anything dedicated to this purpose.
Thanks,
Jimmy Forsyth
From: [email protected]
[mailto:[email protected]] On Behalf Of Murali p
Sent: Tuesday, May 30, 2017 1:46 AM
To: [email protected]
Subject: [onap-discuss] [ONAP-AAI] Few doubts about AAI
Hi All,
I am keen to learn the internals of AAI.I have registered myself to contribute
to AAI.
I have a few doubts about A&AI details. Kindly help or provide a way to clear
the confusion and better understand AAI.
Questions:
1) What is relationship list? How it solves the below?
"A goal of AAI is to do as little coding as possible to introduce a
new service into the service design and
creation environment. To that end, we've introduced a relationship-list
structure."
1.1 Is Edge label (there are many edge labels in DbEdgeRules.java)
same as Relation? Only parent-child relation exists?
2) What is the Model definition stored in AAI from SDC?.Does it store
anything for vFW usecase?
vFW does not have any AAI assets ?
(Model-->ModelElement-->ConstrainedElementSet-->ElementChoiceSet-->Element)
2.1 How this generic structures are used to store Model from SDC?
"Models captures model definitions (subgraph definitions using the
AAI widgets)"
2.2 What is the meaning of above sentence ?
Is there any discussion form or local group to discuss and learn about AAI ?
With regards,
Murali
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