In the context of a service "A" composed with a service "B", introduce 3 instantiation decision policies in policy framework to be called and executed following an SO request to obtain a decision:

• param_in_service_request_rule : the service "B" will be instantiated if a parameter defined for service "A" exists in the SO request with a specific value at run-time.
• service_instance_in_a_set_rule : the service "B" will be instantiated if a service model "B" is not already instantiated in a "set". The set notion can be "the list of service "B" instance attached to a customer" or "the complete list of all service "B" instances in the AAI inventory"
• service_instance_capacity_rule : the service "B" will be instantiated if a service model "B" is already instantiated and has no longer the capacity to support an other service "A" instance.
   

A Rest API has been defined using OpenAPI/swagger standard:

https://gitlab.com/Orange-OpenSource/lfn/onap/service-resolver/blob/master/instantiation_decision_server/src/swagger/swagger.yaml

This specification describes the API between SO and Policy about those instantiation Decision Rules.