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A NetworkFunction is a resource which is able to fulfil a well-defined, non-trivial functionality for a service.

Well-defined means that its specialty can be captured by a word understandable across the industry, such as a firewall, a router, a load balancer, etc. 

It is non-trivial in many senses. First, a NetworkFunction is non-trivial in terms of its connectivity with the outer world. A NetworkFunction-based type is normally defined with multiple capabilities and requirements of different types, which are serving different purposes. Since there is no typical “connectivity set” shared by all function, it cannot be captured by means of TOSCA in the base NetworkFunction node type. That is, the NetworkFunction node type is practically unusable per se. It needs to be further sub-typed, along with extending it with additional capabilities and requirements.

A NetworkFunction is also non-trivial in terms of its internal structure. A NetworkFunction normally has its own internal topology that spans over multiple VMs and has internal networks. A NetworkFunction-typed node is expected to be implemented through substitution. This substitution can be specified by the service designer in design time. However, the service designer may also leave a NetworkFunction-typed node without design-time implementation. In this case, the most appropriate substitution should be found by the Orchestrator in run time.



onap.nodes.resource.NetworkFunction 
   onap.nodes.Resource.NetworkFunction:
    description: |
      a base of the ONAP hierarchy of network functions
      If you have a requirement for a factory, you're allotted
      If you have a requirement for a PNFdevice, you're physical 
      If you have neither, you're virtual.
      Expect to see network functions be group members for naming and homing.
    derived_from: onap.nodes.Resource
    properties:
      nf_classification:
        description: |
          data governed value used by operations to filter network functions
        type: onap.datatypes.NetworkFunctionClassification
        required: true
    capabilities:
      # Expect to define these in the derived node_type, with mappings to appropriate the NetworkFunctionComponent CP
      # This exposes external CPs of the NF.
    requirements:
      # Expect to define these in the derived node_type, with mappings to appropriate inner nodes



Examples

node_types:
  onap.nodes.functions.AbstractFirewall:
  derived_from: onap.nodes.Function
  properties:
    nf_classification:
      constraints:
        - equal: {nf_function: "Firewall"}
  requirements:
    - unprotected:
        capability: onap.capabilities.Linkable
    - protected:
        capability: onap.capabilities.Linkable
      
  vendorXXX.nodes.VerySpecialFirewall:
    derived_from: onap.nodes.functions.AbstractFirewall
    requirements:
      - management:
          capability: onap.capabilities.Linkable






Examples

node_types:
  onap.nodes.functions.AbstractFirewall:
  derived_from: onap.nodes.Function
  properties:
    function:
      type: string
      constraints:
        - equal: "firewall"
  requirements:
    - unprotected:
        capability: onap.capabilities.Linkable
    - protected:
        capability: onap.capabilities.Linkable
      
  vendorXXX.nodes.VerySpecialFirewall:
    derived_from: onap.nodes.functions.AbstractFirewall
    requirements:
      - management:
          capability: onap.capabilities.Linkable




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