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The TOSCA Policy artifact is used internally by the Policy Framework, or is input by CLAMP or other systems. This artifact specifies the values of the properties for the policy and specifies the specific entities the policy acts on. Policy Design uses the TOSCA Policy artifact and the PolicyTypeImpl artifact to create an executable PolicyImpl artifact. 

        Internally, Policy has three main functional areas: Policy Development; Policy Administration; Policy Decision Execution.

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Policy Enforcement is in general not handled by the Policy Framework. Enforcement is handled by either the originator of a decision query (PDP-D does enforce guard policy decisions made in the XACML PDP), or by a reaction to a policy output (trigger). 

The Policy/CLAMP functional entity provides the capability to manage runtime control loops.  It provides the capability to

• Create control loop from DCAE blueprint, those blueprint are either:
  •  sent by SDC to DCAE(inventory) via SDC distribution. 
• Create configuration policy from the policy-model Tosca, the tosca policy-model are either:
  •  sent by SDC via SDC distribution to everyone
  • or query by CLAMP to Policy. in this case the policy-model is either pre-provison in Policy
    or separately provision to Policy via the REST API exposed by Policy.
•  Configure DCAE applications of the control loop
• Associate µService configuration policies to the DCAE application
• Configure the operations to be taken by the control loop (by creating/updating/deleting operational policies)
• Deploy/un-deploy control loop flow (blueprints) to DCAE
• Control loop visualization. 

A more detailed figure and description of the Policy/CLAMP sub-component can be found here: https://docs.onap.org/projects/onap-clamp/en/latest/index.html#master-index

4. Known System Limitations

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1. Honolulu architecture description https://docs.onap.org/projects/onap-policy-parent/en/latest/architecture/architecture.html

2. Policy Framework API's - https://docs.onap.org/projects/onap-policy-parent/en/latest/offeredapis.html

3. Policy/CLAMP:
   1. CLAMP Overview : https://docs.onap.org/projects/onap-clamp/en/latest/index.html#master-index
   2. CLAMP internal interfaces:  https://docs.onap.org/projects/onap-clamp/en/latest/_downloads/d25f20712a4cf2524a1cf13242349743/swagger.pdf 
   3. CLAMP User Guide: https://docs.onap.org/projects/onap-clamp/en/latest/user-guide.html#