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Terminology

Control Loop: A set of executing elements on which Life Cycle Management (LCM) is executed collectively. For example, a set of microservices may be spawned and executed together to deliver a service. This collection of services is a control loop

Control Loop Element: A single executing entitity, with its Life Cycle being managed as part of the overall control loop. For example, a single microservice that is executing as one microservice in a service.

Participant: A system or framework that runs Control Loop Elements. A participant chooses to partake in control loops, to manage Control Loop Elements for CLAMP, and to receive, send and act on LCM messages for the CLAMP runtime.

Control Loop Type: A definition of a Control Loop in the TOSCA language. This definition describes a certain type of a control loop. The life cycle of instances of a Control Loop Type are managed by CLAMP.

Control Loop Instance: An instance of a Control Loop Type. The life cycle of a Control Loop Instance is managed by CLAMP.

Property: Metadata defined in TOSCA that is associated with a Control Loop, a Control Loop Element, or a Participant.

Property Type: The TOSCA defintion of the type of a property. A property can have a generic type such as string or integer or can have a user defined TOSCA data type.

Property Value: The value of a Property Type. Property values are assigned at run time in CLAMP.

Common Property Type: Property Types that apply to all instances of a Control Loop Type.

Common Property Value: The value of a Property Type. It is assigned at run time once for all instances of a Control Loop Type.

Instance Specific Property Type: Property Types that apply to an individual instance of a Control Loop Type.

Instance Property Value: The value of a Property Type that applies to an individual instance of a Control Loop Type. The value is assigned at run time for each control loop instance.

Capabilities

We consider the capabilities of Control Loops at Design Time and Run Time.

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