...

3: APIs and Sequence Diagrams

3.1: Commissioning

Ajay Deep Singh to pad out this section

This section defines Commissioning/CRUD Operations that can be performed on ControlLoops.

A Client, in this case CLAMP, can perform CRUD operations or can commission ControlLoops from DesignTime to RunTime Inventory Database.

DesignTime/RunTime Catalogue/Inventory Database stores ControlLoop definitions, CRUD operations on database supported by REST Endpoints like Get, Delete, Create allowing selection of a particular ControlLoop to be addressed, below sequence diagram will help you understand flow how a client(Clamp) application can initiate Rest call for performing different operations on Database.

API_Gateway Service is for interacting to different database DesignTime/RunTime and should be responsible for responding success or failure status on different operations.

The commissioning of ControlLoops definition from DesignTime Catalogue to RunTime Inventory Database can we achived using the commissioning Rest Endpoint, in this process when a rest request is initiated from a client(Clamp) the API_Gateway Service take cares of fetching ControlLoops metadata from DesignTime and creates in RunTime Inventory Database, Commissioning API ControlLoop Sequence diagram will help you understand the flow.

3.1.1: Commissioning REST API 

3.1.2: Commissioning Sequence Diagrams

1. GET, DELETE, CREATE API ControlLoop Sequence Diagram

   
   

   
   

2. Commission API ControlLoop Sequence Diagram 

   
   

3.2: Instantiation

Robertas Rimkus to pad out this section

This section refers to Instantiation of a Commissioned control loop. A client, in this case CLAMP (potentially DCAEMOD, etc in the future) will render the commissioned control loops allowing selection of a particular control loop to be instantiated. User will then provide the configurations needed to instantiate the selected control loop which will be sent onto the CL_Instance_Control Service. The service will then distribute the configurations to DMaaP topic. Participants (agents) will pull the event containing the config and pick out their control loop components to be instantiated and start/set up those particular components. CL_Instance_Control Service will be waiting for a response back from all participants involved in the instantiation of the control loop, in regards to the state of instantiation. In successful response case the service will store the CL Instance LCM (Life Cycle management) data into the runtime DB as well as providing a message back to the client of the successful instantiation. In failure to receive the response case, a timeout will be called, which will result in a teardown event being sent to DMaaP. The participants will then receive the event and proceed to teardown the components that were instantiated or check that they have failed to instantiate in the first place and send a Teardown ACK back to the CL_Instance_Control Service. No CL Instance LCM data will be stored and a message indicating failure to instantiate the CL along side with the error will be sent back to the client (CLAMP).

3.2.1: Instantiation REST API

3.2.2: Instantiation Sequence Diagrams

3.2.3: Instantiation DMaaP API

Initial Thought for an event to be sent from CL_Instance_Control onto DMaaP for Participants to consume. The event would go onto an output topic which the Participants would be polling/subscribed to

e.g url : https://{{ONAPIP}}:{{DMaaPPort}}/events/CL_INSTANCE_CONTROL_OUTPUT

*Preferred solution is to send TOSCA in the body. Meaning we could reuse the parsing code which is already present and provide it to the participant. 

3.2.4: Instantiation Participant API

*Suggestion was to put JAVA API code in this section for the participant talking to DMaaP. TBD

3.3: Monitoring

In this case it refers to monitoring the data that the participants will provide to DMaaP. Participants will send events to DMaaP which will be pulled by the CL_Supervision_Service in to the runtime database. Monitoring service provides APIs to display the statistics data from runtime database to the Monitoring GUI. The data provided should include a reference id to the control loops that are instantiated on the participant, as well as the applications that have been instantiated as a part of that control loop for that participant. Data should also include the time that the application has started, state of it (running/terminated) and any other critical information which would help to determine the health of an instantiated control loop and its components. Idea is for the participant to provide events every certain period of time, similar to a health-check, in order to provide consistent monitoring.

3.3.1: Monitoring REST API

3.3.2: Monitoring Sequence Diagrams

3.3.3: Monitoring DMaaP API

Participants will send an event containing monitoring data to a DMaaP topic at a set interval after participant has received an event to instantiate a control loop

e.g url: https://{{ONAPIP}}:{{DMaaPPort}}/events/CL_MONITORING_SERVICE_INPUT

3.3.4: Monitoring Participant API

Presume similar thinking to Instantiation Participant API

*Suggestion was to put JAVA API code in this section for the participant talking to DMaaP. TBD

3.4: Supervision

Supervision is responsible for ensuring that

1. control loops are established once their initiation has been ordered
2. control loops are running correctly once their initiation is completed
3. control loops are correctly removed once their removal has been ordered

3.4.1: Supervision Sequence Diagrams

3.4.2: Supervision APIs to other components