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The SDNC network controller in FIgure Figure 1 illustrates the core OpenDaylight framework that supports a model driven service abstraction layer (MD-SAL),  api handlers,  operational and configuration trees, and an adapter framework for integrating with controlled devices, virtual functions,  and cloud infrastructure.  Within this framework the ONAP Service Logic Interpreter (SLI) addition provides an extensible scripting language for expressing service logic through a Direct Directed Graph (DG)  builder based on Node-Red.   The SLI is extended by adding Java classes that can be called as a node in a DG to support frequent complex operations.

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ONAP includes a generic Application Controller (APPC, formerly called APP-C) that receives commands from ONAP components, such as MSO, DCAE, or the Portal, and uses these commands to manage the life cycle of Services, Resources (virtual applications and Virtual Network Functions), and their components. The Application Controller is based on the same OpenDaylight Framework with SLI additions.   The Application Controller project provides SLI node types, adapters, and API handling logic required for the life cycle management of complex, distributed services composed of many VNF types and instances. See the

Documentation:

NOTE: For instructions on how to build and run an ONAP Component (APP-C is taken as an example) locally, please refer to this documentation and the APPC API page.