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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.
The handling of a ControlLoopStateChange message in each participant is as shown below.
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| 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 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 | ||||
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