Supports the Create NS Subscription operation and workflows which do the following sequence:

<Create NS Subscription: note: the following workflow is a template, and it can be enhanced as needed.>

• Supports SOL005-compliant Create NS Subscription operation
• Supports input parameters handling:
  • Initializes Parameters: set subscription filters
    • callback_uri
    • authentication
    • notification_types
    • operation_types
    • operation_states
    • ns_component_types
    • lcm_opname_impactin_nscomponent
    • lcm_opoccstatus_impacting_nscomponent
    • nsInstanceSubscriptionFilter
  • Creates Subscription ID: create subscription id
  • Checks valid auth info:
  • Checks Filter Type:
    • checks if the notification is NOTIFICATION_TYPE.NSLCM_OPERATION_OCCURRENCE_NOTIFICATION
  • Checks Valid:
    • Checks Callback_URI: check callback Uri
      • checks if the callbackUri exists in the NFVO_SUBSCRIPTION DB
        • if no subscription, return true
        • else 
          • checks additional filter types, notificationTypes, operationTypes, operationStates
            • if the filters are NOT equal, return false
          • checks ns instance filter, If the filter type is not equal, return false
        • return true
  • saves subscription request to database
  • returns response with subscription
    *