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.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
.. Copyright 2017 Huawei Technologies Co., Ltd.
SO - Service Orchestration
========================================================
SO Architecture
----------------
.. image:: images/SO_Architecture_1.png
SO Sub-Components
------------------
**API Handler**
RESTful interface to northbound clients
* Handle service-level and infrastructure (VNF & network) requests
Service-agnostic APIs
* “Service Instantiation API”
Model-driven recipe selection
* Use SO Catalog to map input requests to BPMN flows
* Dynamic lookup based on service-model + action
* Input data forwarded to BPMN flow
Track open and completed requests via SO Request DB
Multiple API-H modules may support different APIs
**BPMN Execution Engine**
Open-source Camunda platform
* Support BPMN 2.0 service recipes
Expose RESTful interface to API-H (unique path per recipe)
Make use of common “building block” sub-flows
Sequence orchestration steps for each Resource in the recipe
* Request and configure network resources via SDN-C
* Manage cloud resources via PO (OpenStack)
* Update inventory via A&AI
Perform error handling/rollback
**Resource Adapters**
Interfaces to lower level controllers and other ONAP components
* Platform Orchestrator, SDN-Controller, APP-Controller, VFC-Controllers
* Hides the details of complex interfaces (e.g. OpenStack APIs)
* Expose interfaces to BPMN flows as SOAP or REST APIs
* Support synchronous and asynchronous operations
Provided as part of SO platform for use by all BPMN flows
Use SO Catalog to map resource requests to a recipe/template
Data-driven design
* Catalog templates may be updated via self-service (outside of release cycles)
* Merge input parameters with templates at run-time
**Data Stores**
Request DB
* Tracks open and completed requests
SO Catalog
* SO view of the SDC Catalog
* service and resource models, recipes, and templates
* Populated via SDC distribution service from TOSCA models
Camunda DB
* Maintain state for BPMN flows
* Supports multiple active engines
**SDC Distribution Client**
Receive updated service models from SDC
* Event-bus notifications when new models available
* HTTP retrieval of models (TOSCA) and artifacts (Heat)
Receive distributions as TOSCA models
Populate SO Catalog
Support self-service updates to models and artifacts
Third Party and Open Source
---------------------------
**BPMN Engine**
Camunda (open source)
**Other Open Source Components of Note:**
JBOSS EAP/Wildfly
MySQL/MariaDB
Openstack Java SDK (“woorea”)
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