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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+
+.. _controlloop-participant-protocol-label:
+
+The CLAMP Control Loop Participant Protocol
+###########################################
+
+The CLAMP Control Loop Participant protocol is an asynchronous protocol that is used by the
+CLAMP runtime to coordinate life cycle management of Control Loop instances. The protocol
+supports the functions described in the sections below.
+
+
+Protocol Dialogues
+==================
+
+The protocol supports the dialogues described below.
+
+Participant Registration and De-Registration
+--------------------------------------------
+
+Registration when a participant comes up and update of participant with control loop type
+information and common parameter values for its control loop types.
+
+.. image:: ../images/clamp-cl-participants/participant-registering.png
+
+
+De-registration is executed as a participant goes down.
+
+.. image:: ../images/clamp-cl-participants/participant-deregistration.png
+
+
+Control Loop Priming and De-Priming
+-----------------------------------
+
+When a control loop is primed, the portion of the Control Loop Type Definition and Common
+Property values for the participants of each participant type mentioned in the Control Loop
+Definition are sent to the participants.
+
+.. image:: ../images/clamp-cl-participants/controlloop-priming.png
+
+When a control loop is de-primed, the portion of the Control Loop Type Definition and Common
+Property values for the participants of each participant type mentioned in the Control Loop
+Definition are deleted on participants.
+
+.. image:: ../images/clamp-cl-participants/controlloop-depriming.png
+
+
+Control Loop Update
+-------------------
+
+Control Loop Update handles creation, change, and deletion of control loops on participants.
+Change of control loops uses a semantic versioning approach and follow the semantics described
+on the page `4.1 Management of Control Loop Instance Configurations <management-cl-instance-configs>`.
+
+.. image:: ../images/clamp-cl-participants/controlloop-update.png
+
+The handling of a ControlLoopUpdate message in each participant is as shown below.
+
+.. image:: ../images/clamp-cl-participants/controlloop-update-msg.png
+
+Control Loop State Change
+-------------------------
+
+This dialogue is used to change the state of Control Loops and their Control Loop Elements. The
+CLAMP Runtime sends a Control Loop State Change message on the control loop to all participants.
+Participants that have Control Loop Elements in that Control Loop attempt an update on the state
+of the control loop elements they have for that control loop, and report the result back.
+
+The *startPhase* in the `Definition of TOSCA fundamental Control Loop Types
+<https://github.com/onap/policy-clamp/blob/master/common/src/main/resources/tosca/ControlLoopTOSCAServiceTemplateTypes.yaml>`_
+is particularly important in control loop state changes because sometime the user wishes to control
+the order in which the state changes in Control Loop Elements in a control loop. In state changes
+from *UNITITIALISED* → *PASSIVE* and from *PASSIVE* → *RUNNING*, control loop elements are started in
+increasing order of their *startPhase*. In state changes from *RUNNING* → *PASSIVE* and from *PASSIVE*
+→ *UNITITIALISED*, control loop elements are started in decreasing order of their *startPhase*.
+
+The CLAMP runtime controls the state change process described in the diagram below. The CLAMP runtime
+sends a Control Loop State Change message on DMaaP to all participants in a particular Start Phase so,
+in each state change multiple Control Loop State Change messages are sent, one for each Start Phase in
+the control loop. If more than one Control Loop Element has the same Start Phase, those Control Loop
+Elements receive the same Control Loop State Change message from DMaaP and start in parallel.
+
+The Participant reads each State Change Message it sees on DMaaP. If the Start Phase on the Control
+Loop State Change message matches the Start Phase of the Control Loop Element, the participant processes
+the State Change message. Otherwise the participant ignores the message.
+
+.. image:: ../images/clamp-cl-participants/controlloop-state-change.png
+
+The handling of a ControlLoopStateChange message in each participant is as shown below.
+
+.. image:: ../images/clamp-cl-participants/controlloop-state-change-msg.png
+
+Control Loop Monitoring and Reporting
+-------------------------------------
+
+This dialogue is used as a heartbeat mechanism for participants, to monitor the status of Control Loop
+Elements, and to gather statistics on control loops. The ParticipantStatus message is sent periodically
+by each participant. The reporting interval for sending the message is configurable.
+
+.. image:: ../images/clamp-cl-participants/controlloop-monitoring.png
+
+
+Messages
+========
+
+The CLAMP Control Loop Participant Protocol uses the following messages. The descriptions below give
+an overview of each message. For the precise definition of the messages, see the `CLAMP code at Github
+<https://github.com/onap/policy-clamp/tree/master/models/src/main/java/org/onap/policy/clamp/controlloop/models/messages/dmaap/participant>`_
+. All messages are carried on DMaaP.
+
+
+.. list-table::
+   :widths: 15 10 10 15 15 35
+   :header-rows: 1
+
+   * - Message
+     - Source
+     - Target
+     - Purpose
+     - Important Fields
+     - Field Descriptions
+   * - ParticipantRegister
+     - Participant
+     - CLAMP Runtime
+     - Participant registers with the CLAMP runtime
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * - ParticipantRegisterAck
+     - CLAMP Runtime
+     - Participant
+     - Acknowledgement of Participant Registration
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * -
+     -
+     -
+     -
+     - Result
+     - Success/Fail
+   * -
+     -
+     -
+     -
+     - Message
+     - Message indicating reason for failure
+   * - ParticipantUpdate
+     - CLAMP Runtime
+     - Participant
+     - CLAMP Runtime sends Control Loop Element Definitions and Common Parameter Values to Participants
+     - ParticipantDefinitionUpdateMap
+     - Map with Participant ID as its key, each value on the map is a ControlLoopElementDefintionMap
+   * -
+     -
+     -
+     -
+     - ControlLoopElementDefintionMap
+     - List of ControlLoopElementDefinition values for a particular participant, keyed by its Control
+       Loop Element Definition ID
+   * -
+     -
+     -
+     -
+     - ControlLoopElementDefinition
+     - A ControlLoopElementToscaServiceTemplate containing the definition of the Control Loop Element
+       and a CommonPropertiesMap with the values of the common property values for Control Loop Elements
+       of this type
+   * -
+     -
+     -
+     -
+     - ControlLoopElementToscaServiceTemplate
+     - The definition of the Control Loop Element in TOSCA
+   * -
+     -
+     -
+     -
+     - CommonPropertiesMap
+     - A <String, String> map indexed by the property name. Each map entry is the serialized value of
+       the property, which can be deserialized into an instance of the type of the property.
+   * - ParticipantUpdateAck
+     - Participant
+     - CLAMP Runtime
+     - Acknowledgement of Participant Update
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * -
+     -
+     -
+     -
+     - Result
+     - Success/Fail
+   * -
+     -
+     -
+     -
+     - Message
+     - Message indicating reason for failure
+   * - ParticipantDeregister
+     - Participant
+     - CLAMP Runtime
+     - Participant deregisters with the CLAMP runtime
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * - ParticipantDeregisterAck
+     - CLAMP Runtime
+     - Participant
+     - Acknowledgement of Participant Deegistration
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * -
+     -
+     -
+     -
+     - Result
+     - Success/Fail
+   * -
+     -
+     -
+     -
+     - Message
+     - Message indicating reason for failure
+   * - ControlLoopUpdate
+     - CLAMP Runtime
+     - Participant
+     - CLAMP Runtime sends Control Loop Element instances and Instance Specific Parameter Values for
+       a Control Loop Instance to Participants
+     - ControlLoopId
+     - The name and version of the Control Loop
+   * -
+     -
+     -
+     -
+     - ParticipantUpdateMap
+     - Map with Participant ID as its key, each value on the map is a ControlLoopElementList
+   * -
+     -
+     -
+     -
+     - ControlLoopElementList
+     - List of ControlLoopElement values for the Control Loop
+   * -
+     -
+     -
+     -
+     - ControlLoopElement
+     - A ControlLoopElement, which contains among other things a PropertiesMap with the values of the
+       property values for this Control Loop Element instance and a ToscaServiceTemplateFragment with
+       extra concept definitions and instances that a participant may need.
+   * -
+     -
+     -
+     -
+     - PropertiesMap
+     - A <String, String> map indexed by the property name. Each map entry is the serialized value of
+       the property, which can be deserialized into an instance of the type of the property.
+   * -
+     -
+     -
+     -
+     - ToscaServiceTemplateFragment
+     - A well-formed TOSCA service template containing extra concept definitions and instances that a
+       participant may need. For example, the Policy Participant may need policy type definitions or
+       policy instances to be provided if they are not already stored in the Policy Framework.
+   * - ControlLoopUpdateAck
+     - Participant
+     - CLAMP Runtime
+     - Acknowledgement of Control Loop Update
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * -
+     -
+     -
+     -
+     - ControlLoopId
+     - The name and version of the Control Loop
+   * -
+     -
+     -
+     -
+     - ControlLoopResult
+     - Holds a Result and Message for the overall operation on the participant and a map of Result
+       and Message fields for each Control Loop Element of the control loop on this participant
+   * -
+     -
+     -
+     -
+     - Result
+     - Success/Fail
+   * -
+     -
+     -
+     -
+     - Message
+     - Message indicating reason for failure
+   * - ControlLoopStateChange
+     - CLAMP Runtime
+     - Participant
+     - CLAMP Runtime asks Participants to change the state of a Control Loop
+     - ControlLoopId
+     - The name and version of the Control Loop
+   * -
+     -
+     -
+     -
+     - currentState
+     - The current state of the Control Loop
+   * -
+     -
+     -
+     -
+     - orderedState
+     - The state that the Control Loop should transition to
+   * -
+     -
+     -
+     -
+     - startPhase
+     - The start phase to which this ControLoopStateChange message applies
+   * - ControlLoopStateChangeAck
+     - Participant
+     - CLAMP Runtime
+     - Acknowledgement of Control Loop State Change
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop Type
+       Definitions
+   * -
+     -
+     -
+     -
+     - ControlLoopId
+     - The name and version of the Control Loop
+   * -
+     -
+     -
+     -
+     - startPhase
+     - The start phase to which this ControLoopStateChangeAck message applies
+   * -
+     -
+     -
+     -
+     - ControlLoopResult
+     - Holds a Result and Message for the overall operation on the participant and a map of Result and
+       Message fields for each Control Loop Element of the control loop on this participant
+   * -
+     -
+     -
+     -
+     - Result
+     - Success/Fail
+   * -
+     -
+     -
+     -
+     - Message
+     - Message indicating reason for failure
+   * - ParticipantStatusReq
+     - CLAMP Runtime
+     - Participant
+     - Request that the specified participants return a ParticipantStatus message immediately
+     - ParticipantId
+     - The ID of this participant, if not specified, all participants respond.
+   * - ParticipantStatus
+     - Participant
+     - CLAMP Runtime
+     - Periodic or on-demand report for heartbeat, Participant Status, Control Loop Status, and Control
+       Loop Statistics
+     - ParticipantId
+     - The ID of this participant
+   * -
+     -
+     -
+     -
+     - ParticipantType
+     - The type of the participant, maps to the capabilities of the participant in Control Loop
+       Type Definitions
+   * -
+     -
+     -
+     -
+     - ParticipantDefinitionUpdateMap (returned in repsonse to ParticipantStatusReq only)
+     - See ParticipantUpdate message above for definition of this field
+   * -
+     -
+     -
+     -
+     - ParticipantStatus
+     - The current status of the participant for monitoring
+   * -
+     -
+     -
+     -
+     - ParticipantStatistics
+     - Statistics on the participant such as up time, or messages processed. Can include participant
+       specific data in a string blob that is opaque to CLAMP
+   * -
+     -
+     -
+     -
+     - ControlLoopInfoMap
+     - A map of ControlLoopInfo types indexed by ControlLoopId, one entry for each control loop
+       running on the participant
+   * -
+     -
+     -
+     -
+     - ControlLoopInfo
+     - The ControlLoopStatus and ControlLoopStatistics for a given control loop
+   * -
+     -
+     -
+     -
+     - ControlLoopStatus
+     - The current status of the control loop for monitoring
+   * -
+     -
+     -
+     -
+     - ControlLoopStatistics
+     - Statistics on the control loop such as up time, or messages processed. Can include participant
+       specific data in a string blob that is opaque to CLAMP
+
+
+End of Document