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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+
+.. _clamp-acm_architecture-label:
+
+TOSCA Defined Automation Compositions: Architecture and Design
+##############################################################
+
+
+.. contents::
+    :depth: 4
+
+The idea of using automation compositions to automatically (or autonomously) perform network management
+has been the subject of much research in the Network Management research community, see
+:download:`this paper <files/Acms.pdf>` for some background. However, it is only with
+the advent of ONAP that we have a platform that supports automation compositions for network management.
+Before ONAP, Automation Compositions have been implemented by hard-coding components together and hard
+coding logic into components. ONAP has taken a step forward towards automatic implementation
+of Automation Compositions by allowing parameterization of Automation Compositions that work on the premise that
+the Automation Compositions use a set of analytic, policy, and control components connected together in
+set ways.
+
+The goal of the work is to extend and enhance the current ONAP Automation Composition support to provide
+a complete open-source framework for Automation Compositions. This will enhance the current support to
+provide TOSCA based Automation Composition definition and development, commissioning and run-time management.
+The participants that comprise a Automation Composition and the metadata needed to link the participants
+together to create a Automation Composition are specified in a standardized way using the `OASIS TOSCA
+modelling language <http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/>`_. The TOSCA
+description is then used to commission, instantiate, and manage the Automation Compositions in the run
+time system.
+
+.. image:: images/01-acm-overview.png
+
+1 Terminology
+=============
+
+This section describes the terminology used in the system.
+
+1.1 Automation Composition Terminology
+--------------------------------------
+
+**Automation Composition Type:** A definition of a Automation Composition in the TOSCA language. This definition describes
+a certain type of a automation composition. The life cycle of instances of a Automation Composition Type are managed
+by CLAMP.
+
+**Automation Composition Instance:** An instance of a Automation Composition Type. The life cycle of a Automation Composition
+Instance is managed by CLAMP. A Automation Composition Instance is 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 automation composition.
+
+**Automation Composition Element Type:** A definition of a Automation Composition Element in the TOSCA language. This
+definition describes a certain type of Automation Composition Element for a automation composition in a Automation
+Composition Type.
+
+**Automation Composition Element Instance:** A single entity executing on a participant, with its Life Cycle
+being managed as part of the overall automation composition. For example, a single microservice that is
+executing as one microservice in a service.
+
+**CLAMP Automation Composition Runtime:** The CLAMP server that holds Automation Composition Type definitions and manages
+the life cycle of Automation Composition Instances and their Automation Composition Elements in cooperation with
+participants.
+
+
+1.2 Participant Terminology
+---------------------------
+
+**Participant Type:** Definition of a type of system or framework that can take part in control
+loops and a definition of the capabilities of that participant type. A participant advertises
+its type to the CLAMP Automation Composition Runtime.
+
+**Participant:** A system or framework that takes part in automation compositions by executing Automation Composition
+Elements in cooperation with the CLAMP Automation Composition Runtime. A participant chooses to partake
+in automation compositions, to manage Automation Composition Elements for CLAMP, and to receive, send and act on
+LCM messages for the CLAMP runtime.
+
+1.3 Terminology for Properties
+------------------------------
+
+**Common Properties:** Properties that apply to all Automation Composition Instances of a certain Automation
+Composition Type and are specified when a Automation Composition Type is commissioned.
+
+**Instance Specific Properties:** Properties that must be specified for each Automation Composition Instance
+and are specified when a Automation Composition Instance is Initialized.
+
+1.4 Concepts and their relationships
+------------------------------------
+
+The UML diagram below shows the concepts described in the terminology sections above and how
+they are interrelated.
+
+.. image:: images/02-acm-concepts.png
+
+The Automation Composition Definition concepts describe the types of things that are in the system. These
+concepts are defined at design time and are passed to the runtime in a TOSCA document. The
+concepts in the Automation Composition Runtime are created by the runtime part of the system using the
+definitions created at design time.
+
+.. _acm-capabilities:
+
+2 Capabilities
+==============
+
+We consider the capabilities of Automation Compositions at Design Time and Run Time.
+
+At Design Time, three capabilities are supported:
+
+#. **Automation Composition Element Definition Specification.** This capability allows users to define Automation
+   Composition Element Types and the metadata that can be used on and configured on a Automation Composition Element
+   Type. Users also define the Participant Type that will run the Automation Composition Element when it is
+   taking part in in a automation composition. The post condition of an execution of this capability is that
+   metadata for a Automation Composition Element Type is defined in the Automation Composition Design Time Catalogue.
+
+#. **Automation Composition Element Definition Onboarding.** This capability allows external users and systems
+   (such as SDC or DCAE-MOD) to define the metadata that can be used on and configured on a Automation
+   Composition Element Type and to define the Participant Type that will run the Automation Composition Element when
+   it is taking part in in a automation composition. The post condition of an execution of this capability
+   is that metadata for a Automation Composition Element Type is defined in the Automation Composition Design Time
+   Catalogue.
+
+#. **Automation Composition Type Definition.** This capability allows users and other systems to create Automation
+   Composition Type definitions by specifying a set of Automation Composition Element Definitions from those that
+   are available in the Automation Composition Design Time Catalogue. These Automation Composition Elements will
+   work together to form Automation Compositions. In an execution of this capability, a user specifies the
+   metadata for the Automation Composition and specifies the set of Automation Composition Elements and their Participant
+   Types. The user also selects the correct metadata sets for each participant in the Automation Composition
+   Type and defines the overall Automation Composition Type metadata. The user also specifies the Common
+   Property Types that apply to all instances of a automation composition type and the Instance Specific
+   Property Types that apply to individual instances of a Automation Composition Type. The post condition for
+   an execution of this capability is a Automation Composition definition in TOSCA stored in the Automation Composition
+   Design Time Catalogue.
+
+.. note::
+    Once a Automation Composition Definition is commissioned to the Automation Composition Runtime and has been
+    stored in the Run Time Inventory, it cannot be further edited unless it is decommissioned.
+
+
+At Run Time, the following participant related capabilities are supported:
+
+#. **System Pre-Configuration.** This capability allows participants to register and deregister
+   with CLAMP. Participants explicitly register with CLAMP when they start. Automation Composition Priming
+   is performed on each participant once it registers. The post condition for an execution of this
+   capability is that a participant becomes available (registration) or is no longer available
+   (deregistration) for participation in a automation composition.
+
+#. **Automation Composition Priming on Participants.** A participant is primed to support a Automation Composition Type.
+   Priming a participant means that the definition of a automation composition and the values of Common
+   Property Types that apply to all instances of a automation composition type on a participant are sent
+   to a participant. The participant can then take whatever actions it need to do to support
+   the automation composition type in question. Automation Composition Priming takes place at participant
+   registration and at Automation Composition Commissioning. The post condition for an execution of this
+   capability is that all participants in this automation composition type are commissioned, that is they
+   are prepared to run instances of their Automation Composition Element types.
+
+
+At Run Time, the following Automation Composition Life Cycle management capabilities are supported:
+
+#. **Automation Composition Commissioning:** This capability allows version controlled Automation Composition Type
+   definitions to be taken from the Automation Composition Design Time Catalogue and be placed in the
+   Commissioned Automation Composition Inventory. It also allows the values of Common Property Types
+   that apply to all instances of a Automation Composition Type to be set. Further, the Automation Composition
+   Type is primed on all concerned participants. The post condition for an execution of this
+   capability is that the Automation Composition Type definition is in the Commissioned Automation Composition
+   Inventory and the Automation Composition Type is primed on concerned participants.
+
+#. **Automation Composition Instance Life Cycle Management:** This capability allows a Automation Composition
+   Instance to have its life cycle managed.
+
+   #. **Automation Composition Instance Creation:** This capability allows a Automation Composition Instance to be
+      created. The Automation Composition Type definition is read from the Commissioned Automation Composition
+      Inventory and values are assigned to the Instance Specific Property Types defined for
+      instances of the Automation Composition Type in the same manner as the existing CLAMP client does.
+      A Automation Composition Instance that has been created but has not yet been instantiated on
+      participants is in state UNINITIALIZED. In this state, the Instance Specific Property Type
+      values can be revised and updated as often as the user requires. The post condition for an
+      execution of this capability is that the Automation Composition instance is created in the
+      Instantiated Automation Composition Inventory but has not been instantiated on Participants.
+
+   #. **Automation Composition Instance Update on Participants:** Once the user is happy with the property
+      values, the Automation Composition Instance is updated on participants and the Automation Composition Elements
+      for this Automation Composition Instance are initialized or updated by participants using the control
+      loop metadata. The post condition for an execution of this capability is that the Automation
+      Composition instance is updated on Participants.
+
+   #. **Automation Composition State Change:** The user can now order the participants to change the state
+      of the Automation Composition Instance. If the Automation Composition is set to state RUNNING, each participant
+      begins accepting and processing automation composition events and the Automation Composition Instance is set
+      to state RUNNING in the Instantiated Automation Composition inventory. The post condition for an
+      execution of this capability is that the Automation Composition instance state is changed on
+      participants.
+
+   #. **Automation Composition Instance Monitoring:** This capability allows Automation Composition Instances to be
+      monitored. Users can check the status of Participants, Automation Composition Instances, and Automation
+      Composition Elements. Participants report their overall status and the status of Automation Composition
+      Elements they are running periodically to CLAMP. Clamp aggregates these status reports
+      into an aggregated Automation Composition Instance status record, which is available for monitoring.
+      The post condition for an execution of this capability is that Automation Composition Instances are
+      being monitored.
+
+   #. **Automation Composition Instance Supervision:** This capability allows Automation Composition Instances to be
+      supervised. The CLAMP runtime expects participants to report on Automation Composition Elements
+      periodically. The CLAMP runtime checks that periodic reports are received and that each
+      Automation Composition Element is in the state it should be in. If reports are missed or if a
+      Automation Composition Element is in an incorrect state, remedial action is taken and notifications
+      are issued. The post condition for an execution of this capability is that Automation Composition
+      Instances are being supervised by the CLAMP runtime.
+
+   #. **Automation Composition Instance Removal from Participants:** A user can order the removal of a Automation
+      Composition Instance from participants. The post condition for an execution of this capability is
+      that the Automation Composition instance is removed from Participants.
+
+   #. **Automation Composition Instance Deletion:** A user can order the removal of a Automation Composition Instance
+      from the CLAMP runtime. Automation Composition Instances that are instantiated on participants cannot
+      be removed from the CLAMP runtime. The post condition for an execution of this capability
+      is that the Automation Composition instance is removed from Instantiated Automation Composition Inventory.
+
+#. **Automation Composition Decommissioning:** This capability allows version controlled Automation Composition Type
+   definitions to be removed from the Commissioned Automation Composition Inventory. A Automation Composition
+   Definition that has instances in the Instantiated Automation Composition Inventory cannot be removed.
+   The post condition for an execution of this capability is that the Automation Composition Type
+   definition removed from the Commissioned Automation Composition Inventory.
+
+.. note::
+    The system dialogues for run time capabilities are described in detail on the
+    :ref:`System Level Dialogues <system-level-label>` page.
+
+.. _acm-instance-states:
+
+2.1 Automation Composition Instance States
+------------------------------------------
+
+When a automation composition definition has been commissioned, instances of the automation composition can be
+created, updated, and deleted. The system manages the lifecycle of automation compositions and control
+loop elements following the state transition diagram below.
+
+.. image:: images/03-acm-instance-states.png
+
+3 Overall Target Architecture
+=============================
+
+The diagram below shows an overview of the architecture of TOSCA based Automation Composition
+Management in CLAMP.
+
+.. image:: images/04-overview.png
+
+Following the ONAP Reference Architecture, the architecture has a Design Time part and
+a Runtime part.
+
+The Design Time part of the architecture allows a user to specify metadata for participants.
+It also allows users to compose automation compositions. The Design Time Catalogue contains the metadata
+primitives and automation composition definition primitives for composition of automation compositions. As shown
+in the figure above, the Design Time component provides a system where Automation Compositions can be
+designed and defined in metadata. This means that a Automation Composition can have any arbitrary
+structure and the Automation Composition developers can use whatever analytic, policy, or control
+participants they like to implement their Automation Composition. At composition time, the user
+parameterises the Automation Composition and stores it in the design time catalogue. This catalogue
+contains the primitive metadata for any participants that can be used to compose a Automation
+Composition. A Automation Composition SDK is used to compose a Automation Composition by aggregating the metadata for
+the participants chosen to be used in a Automation Composition and by constructing the references between
+the participants. The architecture of the Automation Composition Design Time part will be elaborated in
+future releases.
+
+Composed Automation Compositions are commissioned on the run time part of the system, where they are
+stored in the Commissioned Automation Composition inventory and are available for instantiation. The
+Commissioning component provides a CRUD REST interface for Automation Composition Types, and implements
+CRUD of Automation Composition Types. Commissioning also implements validation and persistence of incoming
+Automation Composition Types. It also guarantees the integrity of updates and deletions of Automation Composition
+Types, such as performing updates in accordance with semantic versioning rules and ensuring that
+deletions are not allowed on Automation Composition Types that have instances defined.
+
+The Instantiation component manages the Life Cycle Management of Automation Composition Instances and
+their Automation Composition Elements. It publishes a REST interface that is used to create Automation Composition
+Instances and set values for Common and Instance Specific properties. This REST interface is
+public and is used by the CLAMP GUI. It may also be used by any other client via the public
+REST interface. the REST interface also allows the state of Automation Composition Instances to be changed.
+A user can change the state of Automation Composition Instances as described in the state transition
+diagram shown in section 2 above. The Instantiation component issues update and state change
+messages via DMaaP to participants so that they can update and manage the state of the Automation
+Composition Elements they are responsible for. The Instantiation component also implements persistence
+of Automation Composition Instances, automation composition elements, and their state changes.
+
+The Monitoring component reads updates sent by participants. Participants report on the
+state of their Automation Composition Elements periodically and in response to a message they have
+received from the Instantiation component. The Monitoring component reads the contents of
+the participant messages and persists their state updates and statistics records. It also
+publishes a REST interface that publishes the current state of all Participants, Automation
+Composition Instances and their Automation Composition Elements, as well as publishing Participant and
+Automation Composition statistics.
+
+The Supervision component is responsible for checking that Automation Composition Instances are correctly
+instantiated and are in the correct state (UNINITIALIZED/READY/RUNNING). It also handles
+timeouts and on state changes to Automation Composition Instances, and retries and rolls back state
+changes where state changes failed.
+
+A Participant is an executing component that partakes in automation compositions. More explicitly, a
+Participant is something that implements the Participant Instantiation and Participant
+Monitoring messaging protocol over DMaaP for Life Cycle management of Automation Composition Elements.
+A Participant runs Automation Composition Elements and manages and reports on their life cycle
+following the instructions it gets from the CLAMP runtime in messages delivered over DMaaP.
+
+In the figure above, five participants are shown. A Configuration Persistence Participant
+manages Automation Composition Elements that interact with the `ONAP Configuration Persistence Service
+<https://docs.onap.org/projects/onap-cps/en/latest/overview.html>`_
+to store common data. The DCAE Participant runs Automation Composition Elements that manage DCAE
+microservices. The Kubernetes Participant hosts the Automation Composition Elements that are managing
+the life cycle of microservices in automation compositions that are in a Kubernetes ecosystem. The
+Policy Participant handles the Automation Composition Elements that interact with the Policy Framework
+to manage policies for automation compositions. A Automation Participant such as the CDS Participant
+runs Automation Composition Elements that load metadata and configure controllers so that they can
+partake in automation compositions. Any third party Existing System Participant can be developed to
+run Automation Composition Elements that interact with any existing system (such as an operator's
+analytic, machine learning, or artificial intelligence system) so that those systems can
+partake in automation compositions.
+
+4. Other Considerations
+=======================
+
+.. _management-cl-instance-configs:
+
+4.1 Management of Automation Composition Instance Configurations
+----------------------------------------------------------------
+
+In order to keep management of versions of the configuration of automation composition instances
+straightforward and easy to implement, the following version management scheme using
+semantic versioning is implemented. Each configuration of a Automation Composition Instance and
+configuration of a Automation Composition Element has a semantic version with 3 digits indicating
+the **major.minor.patch** number of the version.
+
+.. note::
+    A **configuration** means a full set of parameter values for a Automation Composition Instance.
+
+.. image:: images/05-upgrade-states.png
+
+Change constraints:
+
+#. A Automation Composition or Automation Composition Element in state **RUNNING** can be changed to a higher patch
+   level or rolled back to a lower patch level. This means that hot changes that do not
+   impact the structure of a Automation Composition or its elements can be executed.
+
+#. A Automation Composition or Automation Composition Element in state **PASSIVE** can be changed to a higher
+   minor/patch level or rolled back to a lower minor/patch level. This means that structural
+   changes to Automation Composition Elements that do not impact the Automation Composition as a whole can be
+   executed by taking the automation composition to state **PASSIVE**.
+
+#. A Automation Composition or Automation Composition Element in state **UNINITIALIZED** can be changed to a higher
+   major/minor/patch level or rolled back to a lower major/minor/patch level. This means
+   that where the structure of the entire automation composition is changed, the automation composition must
+   be uninitialized and reinitialized.
+
+#. If a Automation Composition Element has a **minor** version change, then its Automation Composition Instance
+   must have at least a **minor** version change.
+
+#. If a Automation Composition Element has a **major** version change, then its Automation Composition Instance
+   must have a **major** version change.
+
+4.2 Scalability
+---------------
+
+The system is designed to be inherently scalable. The CLAMP runtime is stateless, all state
+is preserved in the Instantiated Automation Composition inventory in the database. When the user
+requests an operation such as an instantiation, activation, passivation, or an uninitialization
+on a Automation Composition Instance, the CLAMP runtime broadcasts the request to participants over
+DMaaP and saves details of the request to the database. The CLAMP runtime does not directly
+wait for responses to requests.
+
+When a request is broadcast on DMaaP, the request is asynchronously picked up by participants
+of the types required for the Automation Composition Instance and those participants manage the life
+cycle of its automation composition elements. Periodically, each participant reports back on the status
+of operations it has picked up for the Automation Composition Elements it controls, together with
+statistics on the Automation Composition Elements over DMaaP. On reception of these participant messages,
+the CLAMP runtime stores this information to its database.
+
+The participant to use on a automation composition can be selected from the registered participants
+in either of two ways:
+
+**Runtime-side Selection:** The CLAMP runtime selects a suitable participant from the list of
+participants and sends the participant ID that should be used in the Participant Update message.
+In this case, the CLAMP runtime decides on which participant will run the Automation Composition Element
+based on a suitable algorithm. Algorithms could be round robin based or load based.
+
+**Participant-side Selection:** The CLAMP runtime sends a list of Participant IDs that may be used
+in the Participant Update message. In this case, the candidate participants decide among
+themselves which participant should host the Automation Composition Element.
+
+This approach makes it easy to scale Automation Composition life cycle management. As Automation Composition
+Instance counts increase, more than one CLAMP runtime can be deployed and REST/supervision
+operations on Automation Composition Instances can run in parallel. The number of participants can
+scale because an asynchronous broadcast mechanism is used for runtime-participant communication
+and there is no direct connection or communication channel between participants and CLAMP
+runtime servers. Participant state, Automation Composition Instance state, and Automation Composition Element
+state is held in the database, so any CLAMP runtime server can handle operations for any
+participant. Because many participants of a particular type can be deployed and participant
+instances can load balance automation composition element instances for different Automation Composition Instances
+of many types across themselves using a mechanism such as a Kubernetes cluster.
+
+
+4.3 Sandboxing and API Gateway Support
+--------------------------------------
+
+At runtime, interaction between ONAP platform services and application microservices are
+relatively unconstrained, so interactions between Automation Composition Elements for a given Automation
+Composition Instance remain relatively unconstrained. A
+`proposal to support access-controlled access to and between ONAP services
+<https://wiki.onap.org/pages/viewpage.action?pageId=103417456>`_
+will improve this. This can be complemented by intercepting and controlling services
+accesses between Automation Composition Elements for Automation Composition Instances for some/all Automation
+Composition types.
+
+API gateways such as `Kong <https://konghq.com/kong/>`_ have emerged as a useful technology
+for exposing and controlling service endpoint access for applications and services. When a
+Automation Composition Type is onboarded, or when Automation Composition Instances are created in the Participants,
+CLAMP can configure service endpoints between Automation Composition Elements to redirect through an
+API Gateway.
+
+Authentication and access-control rules can then be dynamically configured at the API gateway
+to support constrained access between Automation Composition Elements and Automation Composition Instances.
+
+The diagram below shows the approach for configuring API Gateway access at Automation Composition
+Instance and Automation Composition Element level.
+
+.. image:: images/06-api-gateway-sandbox.png
+
+At design time, the Automation Composition type definition specifies the type of API gateway configuration
+that should be supported at Automation Composition and Automation Composition Element levels.
+
+At runtime, the CLAMP can configure the API gateway to enable (or deny) interactions between
+Automation Composition Instances and individually for each Automation Composition Element. All service-level
+interactions in/out of a Automation Composition Element, except that to/from the API Gateway, can be
+blocked by networking policies, thus sandboxing a Automation Composition Element and an entire Automation
+Composition Instance if desired. Therefore, a Automation Composition Element will only have access to the APIs
+that are configured and enabled for the Automation Composition Element/Instance in the API gateway.
+
+For some Automation Composition Element Types the Participant can assist with service endpoint
+reconfiguration, service request/response redirection to/from the API Gateway, or
+annotation of requests/responses.
+
+Once the Automation Composition instance is instantiated on participants, the participants configure
+the API gateway with the Automation Composition Instance level configuration and with the specific
+configuration for their Automation Composition Element.
+
+Monitoring and logging of the use of the API gateway may also be provided. Information and
+statistics on API gateway use can be read from the API gateway and passed back in monitoring
+messages to the CLAMP runtime.
+
+Additional isolation and execution-environment sandboxing can be supported depending on the
+Automation Composition Element Type. For example: ONAP policies for given Automation Composition Instances/Types
+can be executed in a dedicated PDP engine instances; DCAE or K8S-hosted services can executed
+in isolated namespaces or in dedicated workers/clusters; etc..
+
+
+5 APIs and Protocols
+====================
+
+The APIs and Protocols used by CLAMP for Automation Compositions are described on the pages below:
+
+#. :ref:`System Level Dialogues <system-level-label>`
+#. :ref:`The CLAMP Automation Composition Participant Protocol <acm-participant-protocol-label>`
+#. :ref:`REST APIs for CLAMP Automation Compositions <acm-rest-apis-label>`
+
+
+6 Design and Implementation
+===========================
+
+The design and implementation of TOSCA Automation Compositions in CLAMP is described for each executable entity on the pages below:
+
+#. :ref:`The CLAMP Automation Composition Runtime Server <clamp-acm-runtime>`
+#. :ref:`CLAMP Automation Composition Participants <clamp-acm-participants>`
+#. :ref:`Managing Automation Compositions using The CLAMP GUI <clamp-gui-acm>`
+
+End of Document
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