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diff --git a/docs/developer_info/BPMN_Main_Process_Flows.rst b/docs/developer_info/BPMN_Main_Process_Flows.rst new file mode 100644 index 0000000000..43e08ffd9c --- /dev/null +++ b/docs/developer_info/BPMN_Main_Process_Flows.rst @@ -0,0 +1,40 @@ +.. 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. + +BPMN Main Process Flows +======================== + +Characteristics +---------------- + +**Invoked by an API Handler** + + The BPMN application (war) exposes a REST endpoint to which the API Handler(s) send requests for flow execution. The message sent by the API Handler to this endpoint is a JSON wrapper containing: + + * The original request received by the API handler from the portal or other client. + * Metadata such as the request-id generated by the API Handler for the request. + * The name of the BPMN process to execute (obtained by the API Handler from the mso_catalog.service_recipe table. + +**Asynchronous Service Model** + + All main process flows implement an asynchronous service model. The connection to the API Handler is kept open until the main process flow sends back a response. In the flow shown below, this is done by the "Send Sync Ack Response" script task. A flow is expected to send a response after validating the request, but before performing any long running tasks or tasks that could cause the process to be suspended. + + After the synchronous response is sent, the flow continues to execute. When the flow ends, it may optionally send an asynchronous notification to a callback URL provided in the original request (behavior depends on the API agreement) + +**Typically calls one or more subprocess flows** + + Main process flows usually implement the high-level service logic, delegating the "real" work to reusable subflows (Building Blocks) or custom subflows + +**Handles "Completion" and "Fallout" tasks** + + "Completion" tasks are those that occur when the process ends successfully, and "Fallout" tasks are those that occur when the process fails. Activities include: + + * Updating the mso_requests database. + * Rolling back uncompleted work. + * Sending an asynchronous callback notification. + +Example: CreateVfModuleVolumeInfraV1.bpmn +------------------------------------------ + +.. image:: images/BPMN_Main_Process_Flows_1.png
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