13 files changed, 939 insertions, 0 deletions
diff --git a/docs/developer_info/BBUnderstanding.rst b/docs/developer_info/BBUnderstanding.rst
index 2aa7097ad9..6e96e5dca2 100644
--- a/docs/developer_info/BBUnderstanding.rst
+++ b/docs/developer_info/BBUnderstanding.rst
@@ -5,3 +5,443 @@
 Building Block Understanding
 ============================
 
+UNDERSTANDING BUILDING BLOCKS USING MACRO FLOW
+----------------------------------------------
+
+
+
+There are basically 2 flows - macro , a la carte.
+
+In a la carte we manually will initiate each step for a process.
+
+In macro , the whole flow happens at a single click - like if we want to create a service, the flow will itself look whether there are vnfs, pnfs or networks in the service and it will be created and activated in the flow also.
+
+Thus these independent tasks like if vnf is present, then assign create and activate vnf are all taken up as individual building blocks and are only called on need basis.
+
+
+Each and every request will reach to the api handler first.
+
+API HANDLER( ServiceInstances.java )
+------------------------------------
+
+
+
+# 1. Rest call reaching SO Api handler with the input json - According to the below path it is mapped to the createServiceInstance function in ServiceInstances file.
+
+curl -v -H "Content-Type: application/json" -X POST --data @serviceinstance.json -u mso_admin:password1$ http://localhost:8080/onap/so/infra/serviceInstantiation/v7/serviceInstances.
+
+# 2. Herein a unique requestid is generated corresponding to every request, and is checked whether that particular requestid exists in request db (Happens in createServiceInstance in ServiceInstances).
+
+ a. http://request-db-adapter:8083/infraActiveRequests/requestid (GET), which will return a 404 if not exists.
+
+ b. CreateInstance is set to the action variable. Here the request scope is set to service from the inputjson - modelType.
+
+# 3. Running local validations on input json.
+
+# 4. create InfraActiveRequests, to store request details in request db adapter and as a payload to bpmn.
+
+ a. A new InfraActiveRequests object is created. And all the necessary information from the input is set to it.
+
+ b. Retrieving productFamilyName from the input json to put into requests db. http://aai/servicedesigncreation/services/service/{productfamilyid} (GET), which will return a 404 if not exists in aai. If service exists, then that service's serviceDescritiption is set as productfamilyName.
+
+ c. http://aai/cloudinfrastructure/cloudregions/cloudregion/cloudowner/{lcpCloudRegionId}/tenants/tenant/{tenantId} (GET), checks for whether the particular cloud configuration exists in aai, if not exists returns 404.  If we are able to get, then the tenant's name derived from aai is set as tenantName.
+
+ d. serviceInstanceNamee is derived from requestInfo.instanceName and is set.
+
+ e. Request json is also set as RequestBody of InfraActiveRequests.
+
+# 5. Checks fro whether duplicate name exists.
+
+ a. version v[integer] is converted to the particular integer and stored.
+
+ b. Checks whether instance name already exists in with a POST request in http://request-db-adapter:8083/infraActiveRequests/checkInstanceNameDuplicate, with the data { instanceIdmap = null, instanceName = {instanceName} , instanceservice = service } . It checks for the current progress and if in progress it throws the particular status.
+
+# 6. Gets the orchestration url from the recipe table.
+
+ a. Checks whether the service already exists in catalogdb http://catalog-db-adapter:8082/service/{modelNameVersionId} (GET).
+
+ b. Checks the service recipe table with the modelNameVersionId and the action to be performed http://catalog-db-adapter:8082/serviceRecipe/search/findFirstByServiceModelUUIDAndAction?serviceModelUUID={modelNameVersionId}&action=createInstance . Returns a 404 if no recipe exists with the corresponding id.
+
+ c. As recipe corresponding to this doesn't exist, we try to get with a default value. This flow comes under generic resource flow so the default value is GR-API-DEFAULT. First we get service with this value http://catalog-db-adapter:8082/service/search/findFirstByModelNameOrderByModelVersionDesc?modelName=GR-API-DEFAULT (GET). It returns a service with modelUUID as d88da85c-d9e8-4f73-b837-3a72a431622b, and further can be used to get the recipe.
+ 
+ d. http://catalog-db-adapter:8082/serviceRecipe/search/findFirstByServiceModelUUIDAndAction?serviceModelUUID=d88da85c-d9e8-4f73-b837-3a72a431622b&action=createInstance (GET), gives a recipe which has a parameter "orchestrationUri" as "/mso/async/services/WorkflowActionBB". 
+
+# 7. Updates the infraActiveRequests with the current request.
+ a. http://request-db-adapter:8083/infraActiveRequests/ (POST) with the data formed. And a 201 created response is received.
+
+# 8. Call the bpmn with a post call on orchestrationUri. The data to bpmn is prepared having parameters like 
+ a. bpmnRequest - formed from input request.
+
+ b. vfModuleId, pnfCorrelationId, networkId, configurationId, vfModuleType, serviceInstanceId , serviceType are updated if present in the input json or else set to empty string.
+
+ c. apiVersion , requestId, aLaCarte = false (def), recipeTimeout = 180(def), requestAction= createInstance are all updated accordingly.
+
+ d. requestUri - v7/serviceInstances ,which is formed from the request url.
+
+
+# 9. A sync response is obtained on reaching bpmn like {"requestReferences":{"requestId":"c45702f7-3f08-4081-bc98-2f9f18b81607","instanceId":"cadca18f-9bff-44be-8910-ad29d342e91f","requestSelfLink":"http://159.138.57.166:30277/orchestrationRequests/v7/c45702f7-3f08-4081-bc98-2f9f18b81607"}}.
+
+
+
+
+
+
+BPMN
+-----
+
+
+Hits WorkflowActionBB.bpmn
+--------------------------
+
+.. image:: ../images/workflow.png
+
+
+# 1. RetrieveBBExecutionList - implemented in selectExecutionList in WorkflowAction.java
+
+a. resourcetype, resourceid are formed from matching the requestUri to a regex pattern matcher [pattern=[vV]\d+.*?(?:(?:/(?<type>vnfs|vfModules|networks|networkCollections|volumeGroups|serviceInstances|instanceGroups)(?:/(?<id>[^/]+))?)(?:/(?<action>[^/]+))?(?:/resume)?)] .
+
+b. Checks whether there is a service subscription with service instance name as {instanceName} correspoding to the customer in aai https://aai.onap:8443/aai/v19/business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances?depth=2&resultIndex=0&resultSize=1&service-instance-name={instanceName}. Returns 404 not found, if it doesnt exists then the id of that particular instance is taken and given as both the resourceid and serviceinstance id. If not present then a random value is generated, and is assigned same to both.
+
+c. Checks whether there is a service of the particular serviceInstanceId exists in aai. https://aai.onap:8443/aai/v19/nodes/service-instances/service-instance/{serviceInstanceId} , returns not found if it doesnt exist. If service with corresponding instance name already exists , then flowsToExecute is got by quering the requestdbadapter with the earlier request id.  If not present, then only orchestrationflows are got, and later from that the flowsToExecute are found out.
+
+d. Get the particular service from catalogdb . http://so-catalog-db-adapter.onap:8082/service/{modelNameVersionId}  (GET). Be sure that the service with this particular modelNameVersionId exists in catalogdb, because based on the services (like whether pnf, or vnf, or networkcollection) present in that particular service, which all bbs to execute are decided.
+
+e. This being a service, "service" is added to the resource list. And is checked upon for other resources like vnf and   network, eg:
+
+ http://so-catalog-db-adapter.onap:8082/service/{modelNameVersionId}/vnfCustomizations (GET)
+ http://so-catalog-db-adapter.onap:8082/service/{modelNameVersionId}/collectionResourceCustomizations (GET)
+ http://so-catalog-db-adapter.onap:8082/service/{modelNameVersionId}/networkCustomizations (GET)
+ And depending on the reources in the service, the resources found is updated like
+ Found :Service - 1    Vnf - 0    Pnf - 0    VfModule - 0    VolumeGroup - 0    Network - 0    VirtualLink - 0    NetworkCollection - 0    Configuration - 0    InstanceGroup - 0 
+
+f. Then the orchestration flows are get from the orchestration_flow_table depending on the cloudowner and request scope: http://so-catalog-db-adapter.onap:8082/northbound_request_ref_lookup/search/findOneByActionAndRequestScopeAndIsAlacarteAndCloudOwnerAndServiceType action=createInstance&requestScope=Service&isALaCarte=false&cloudOwner={CloudOwner}&serviceType=%2A (GET) Here if present, then the orchestration flows are returned or else with default cloud owner, we try again
+
+http://so-catalog-db-adapter.onap:8082/northbound_request_ref_lookup/search/findOneByActionAndRequestScopeAndIsAlacarteAndCloudOwnerAndServiceType?action=createInstance&requestScope=Service&isALaCarte=false&cloudOwner=DEFAULT&serviceType=%2A (GET)
+Here in northBoundRequest is returned which has the parameter orchestrationFlowList, that contains the link that will return the orchestration flows.
+
+"orchestrationFlowList" : { "href" : "http://so-catalog-db-adapter.onap:8082/northbound_request_ref_lookup/101/orchestrationFlowList"} 
+
+Now we do a get on the orchestration flow link to get the set of orchestartion flows required
+http://so-catalog-db-adapter.onap:8082/northbound_request_ref_lookup/101/orchestrationFlowList.
+Here a set of 20 orchestration flows are returned under the action of Service-Macro-Create, each with a sequence no assigned sequentially in the given order
+AssignServiceInstanceBB, 
+
+CreateNetworkCollectionBB,
+
+AssignNetworkBB,
+
+AssignVnfBB, 
+
+AssignVolumeGroupBB,
+
+AssignVfModuleBB,
+
+ConfigAssignVnfBB,
+
+AssignPnfBB, 
+
+WaitForPnfReadyBB,
+
+ActivatePnfBB,
+
+CreateNetworkBB,
+
+ActivateNetworkBB,
+
+CreateVolumeGroupBB, 
+
+ActivateVolumeGroupBB, 
+
+CreateVfModuleBB,
+
+ActivateVfModuleBB, 
+
+ConfigDeployVnfBB,
+
+ActivateVnfBB, 
+
+ActivateNetworkCollectionBB,
+
+ActivateServiceInstanceBB.
+
+
+.. image:: ../images/flowchart.png
+
+
+g. Flows to execute is determined by iterating through all the orchestartion flows and matching it with the found resources. It is merely a contains matching. In this particular as service was the only resource : List of BuildingBlocks to execute:AssignServiceInstanceBB, ActivateServiceInstanceBB.
+
+h. processing data is added to the requestdbadapter. Here the data is post to the requestdb as two different building blocks http://so-request-db-adapter.onap:8083/requestProcessingData.
+
+i. The already stored request details in request db is ammended like "lastModifiedBy" : "CamundaBPMN" , and status to in_progress with a put request.
+
+
+# 2. sendSyncAck -  This was used to give an acknowledgement , with status code as 200, and requestId and resourceId is sent as content.
+
+
+# 3. Prevalidate the workflow
+
+
+# 4. SelectBB - implemented in selectBBin WorkflowActionBBTasks
+This is used to select the building block from the flows to execute depending on the sequence order.
+
+ a. Depending on the current sequence , the building block is selected from the flows to execute.
+ 
+ b. Execution variable, that is passed between the different building blocks as the payload is ammended as:
+
+  execution.setVariable("buildingBlock", buildingblockselected).
+
+ c. current sequence is incremented by 1, and updated in execution variable.
+
+ d. Depending on whether currentSequence is greater than flowsToExecute.size(), COMPLETED variable is either set to true or false.
+
+
+# 5. updateFlowStatistics - implemented in updateFlowStatistics in WorkflowActionBBTasks
+a. Depending on the current sequence no, the completed bb and next bb is got from the flows to execute. And these are mentioned in a statusMessage.
+b. Percentage progress is got from the total no of bbs
+c. These are ammended to the already present request in the request db
+
+# 6. Execute BB - calls the ExecuteBuildingBlock.bpmn
+
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+Hits ExecuteBuildingBlock.bpmn
+------------------------------
+
+.. image:: ../images/ExecuteBuildingBlock.png
+
+# 1. BBInputSetup - implemented in execute in BBInputSetup
+Here a generalbuildingblock is formed from executingbuildingblock after certain updations and validations.
+
+ a. lookupKeyMap is formed from the input , and a map is formed with serviceInstanceId, networkID, vnfID, pnfID, vfmoduleID, volumegroupID, configurationID, instancegroupID as the keys.
+
+ b. Depending on whether a la carte or macro , different flows are called. getGBBMacro is called in here.
+
+ c. In getGBBMacro , a valid customer is got with service subscription.(getCustomerAndServiceSubscription)
+
+  First a customer is got by get request on https://aai.onap:8443/aai/v19/business/customers/customer/{globalSubscriberId}
+
+  After that ServiceSubscription is got by doing a get request
+  https://aai.onap:8443/aai/v19/business/customers/customer/{globalSubscriberId}/service-subscriptions/service-subscription/service
+
+  If, the above request doesnt give any , then ServiceSubscription is fetched by first creating uri keys
+  https://aai.onap:8443/aai/v19/nodes/service-instances/service-instance/{resourceId}?format=pathed.
+  Then ServiceSubscription is got from the globalSubscriberId and the uri keys
+
+'Note': a valid customer and a corresponding ServiceSubscription must be present in the aai, for setting up the customer to gbuildingblock
+
+ d. project and owningEntity is updated from the input
+
+ e. service is got from the catalog db either by ModelVersionId or by ModelVersion and ModelInvariantId.
+
+ f. ServiceInstance is created from the above parameters, and this ServiceInstance is used in the preparation of general building block.
+
+ g. Depending on whether the current executing block name contains either of the network, or configuration, or network collection. A new instance of the corresponding type is created and is updated to the general building block (Happens in getGBBMacroNoUserParamsCreate)
+
+ h. This general building block is set to the gBuildingBlockExecution and gBBInput parameter of execution.
+
+
+# 2. StatusPolicy - implemented in validateOrchestrationStatus in OrchestrationStatusValidator. Input being gBuildingBlockExecution
+ a. orchestrationStatus is obtained after checking the resource type. We had updated the orchestrationStatus in the above step when a new service instance was created.
+ b. OrchestrationStatusStateTransitionDirective is got by doing a get call to the catlog db with the url as findOneByResourceTypeAndOrchestrationStatusAndTargetAction
+http://so-catalog-db-adapter.onap:8082/orchestrationStatusStateTransitionDirective/search/findOneByResourceTypeAndOrchestrationStatusAndTargetAction?resourceType=SERVICE&orchestrationStatus=PRECREATED&targetAction=ASSIGN
+ c. orchestrationStatusValidationResult parameter is set to execution variable from the OrchestrationStatusStateTransitionDirective.getFlowDirective() "flowDirective" : "CONTINUE"
+
+# 3. Prevalidate the gBuildingBlockExecution
+
+# 4. BB To Execute: Depending on which building block is to be executed, that particular bpmn is called .In this case, AssignServiceInstanceBB is called
+
+-------------------------------------------------------------------------------------------------------------------------
+
+Hits AssignServiceInstanceBB.bpmn
+---------------------------------
+
+.. image:: ../images/AssignServiceInstanceBB.png
+
+# 1. AAI create service subscription - implemented in createServiceSubscription of createAAITasks
+This method is used for creating and subscribing the service in A&AI
+
+ a. Customer is got from the general building block that was updated above
+
+ b. Here a serviceSubscriptionURI is formed by taking in the globalSubscriberId and the serviceType
+
+ c. If a service subscription for the particular customer doesnt exist in AAI, then a new subscription is created by taking in the serviceSubscriptionURI
+
+GET performed on uri:https://aai.onap:8443/aai/v19/business/customers/customer/slice1/service-subscriptions/service-subscription/service?
+{"results":[{"service-subscription":1}]}
+
+# 2. AAI create service instance - implemented in createServiceInstance of createAAITasks
+This method is used for creating the service instance in A&AI
+
+ a. Customer is got from the general building block that was updated above
+
+ b. A serviceInstanceURI is formed by taking in the globalSubscriberId, the serviceType and the service instance id
+
+ c. If the service instance in the particular path doesnt exist in AAI , then a new service instance is created by using the serviceInstanceURI
+
+GET to:https://aai.onap:8443/aai/v19/business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances/service-instance/2b955def-e536-40ee-84cb-3f06e3cc6d84?
+response: {"requestError":{"serviceException":{"messageId":"SVC3001","text":"Resource not found for %1 using id %2 (msg=%3) (ec=%4)","variables":["GET","business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances/service-instance/2b955def-e536-40ee-84cb-3f06e3cc6d84","Node Not Found:No Node of type service-instance found at: business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances/service-instance/2b955def-e536-40ee-84cb-3f06e3cc6d84","ERR.5.4.6114"]}}}
+
+Sending HTTP PUT to:https://aai.onap:8443/aai/v19/business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances/service-instance/2b955def-e536-40ee-84cb-3f06e3cc6d84 
+with req body : {"service-instance-id":"2b955def-e536-40ee-84cb-3f06e3cc6d84","service-instance-name":"DEMO_123456","model-invariant-id":"944862ae-bb65-4429-8330-a6c9170d6672","model-version-id":"d88da85c-d9e8-4f73-b837-3a72a431622b","orchestration-status":"Inventoried"}
+
+# 3. AAI create project - implemented in createProject of createAAITasks
+This method is used for creation of the project A&AI. Here too it checks whether a project with a  {projectName} exist in AAI . If not it creates one, and connects it to the service instance identified by the serviceInstanceId
+Sending HTTP PUT to:https://aai.onap:8443/aai/v19/business/projects/project/name%20of%20proj/relationship-list/relationship
+with req body: {"related-link":"/business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances/service-instance/2b955def-e536-40ee-84cb-3f06e3cc6d84"}
+
+# 4. AAI create owning entity -  implemented in createOwningEntity of createAAITasks
+
+ a. OwningEntityId and OwningEntityName is extracted from the OwningEntity given in the input json
+
+ b. If both of them are null, then an exception is raised.
+
+ c. If only OwningEntityId is null, then whether the OwningEntityName is present in AAI is checked. If present then OwningEntityId is set by quering the OwningEntity from AAI. And then connect it to the service instance. If not present in the aai then a random id is generated and assigned to  OwningEntityId. Then Owning entity is first created and then connected to the service instance
+
+ d. Depending on whether the owning entity is already present or not, either createOwningEntityandConnectServiceInstance is called, or connectOwningEntityandServiceInstanceis called.
+
+Sending HTTP PUT to:https://aai.onap:8443/aai/v19/business/owning-entities/owning-entity/owningEntityIdof%20owningEntity/relationship-list/relationship
+req body: {"related-link":"/business/customers/customer/slice1/service-subscriptions/service-subscription/service/service-instances/service-instance/2b955def-e536-40ee-84cb-3f06e3cc6d84"}
+
+# 5. SDNC Create Assign Request - implemented in assignServiceInstance of SDNCAssignTasks
+
+ a. Here first the requestContext, serviceInstance, customer are obtained from the general building block
+
+ b. Then a payload for the assignServiceInstance of the sdnc is formed by passing in the above parameters to the assignServiceInstance in sdncSIResources.
+
+ c. A new sdnc request is formed with the above thing as payload
+
+ d. This sdnc request is assigned to the SDNCRequest parameter of the execution variable
+
+.. code-block:: bash
+
+ {"input":{
+  "request-information" : {
+    "request-action" : "CreateServiceInstance",
+    "source" : "MSO",
+    "request-id" : "139636cd-4b69-4c3a-9e67-fed2c283baee"
+
+  },
+  "sdnc-request-header" : {
+
+    "svc-request-id" : "9bfe8cb0-bb8b-4dca-949d-2f2b51011b54",
+    "svc-action" : "assign"
+
+  },
+  "service-information" : {
+
+    "onap-model-information" : {
+      "model-name" : "GR-API-DEFAULT",
+      "model-version" : "1.0",
+      "model-uuid" : "d88da85c-d9e8-4f73-b837-3a72a431622b",
+      "model-invariant-uuid" : "944862ae-bb65-4429-8330-a6c9170d6672"
+
+    },
+    "subscription-service-type" : "service",
+    "service-id" : "2b955def-e536-40ee-84cb-3f06e3cc6d84",
+    "global-customer-id" : {global_customerid},
+    "service-instance-id" : "2b955def-e536-40ee-84cb-3f06e3cc6d84"
+
+  },
+  "service-request-input" : {
+
+    "service-input-parameters" : {
+      "param" : [ {
+        "name" : "some name",
+        "value" : "some value"
+
+      } ]
+
+    },
+    "service-instance-name" : {instance_name}
+  }
+ }}
+
+# 6. It calls another bpmn file - SDNCHandler.bpmn
+
+ a. Setup callback variables -  Here mainly the correlator variable and the sdnc timeout variable is set
+
+ b. callSDNC -  Here post call to sdnc client is done with the above prepared payload. And then isSDNCCompleted is set to the execution variable
+
+Both the above tasks are implemented in SDNCRequestTasks.
+http://sdnc-oam.onap:8282/restconf/operations/GENERIC-RESOURCE-API:service-topology-operation/
+
+# 7. AAI Update (svc instance)- implemented in th updateOrchestrationStatusAssignedService in AAIUpdateTasks
+ BPMN access method to update the status of Service to Assigned in AAI.
+ Here serviceInstance is obtained , then its orchestration status is changed to assigned  and is updated in the AAI
+
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+Reaches back to ExecuteBuildingBlock.bpmn
+
+# 5. Post validate the generic building block
+
+# 6. Set Handling Code To Success - implemented in setHandlingStatusSuccess in ExecuteBuildingBlockRainyDay
+handling code is set to success for the execution variable
+
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+Reaches back to WorkflowActionBB.bpmn
+
+# 7. postProcessingExecuteBB 
+If the building block excuted is ActivateVfModuleBB, then a postProcessingExecuteBBActivateVfModule needs to be executed
+
+Then again it is looped back to selectBB through a checkRetryStatus block.
+This block comes into play only if the handlingCode is retry, and the retry count is lesser than the maximum allowed no of retries, then the current sequence is again reduced by 1 , so that the same block is executed again.Request in the requestdb is updated with a setRetryStatusMessage, keeping an eye on the no of retries executed.
+
+
+And in this particular example ActivateServiceInstanceBB.bpmn is called next in the sequence.
+Here updateOrchestrationStatusActiveService is called, which is BPMN access method to update status of Service to Active in AAI. Here orchestrationStatus is set to active for the particular service instance and is updated in the AAI .
+
+# 8. updateRequestStatusToComplete is called if the "complete" flag is true
+ a. Here first the request is got from the requestDbclient http://request-db-adapter:8083/infraActiveRequests/requestid 
+
+ b. Then a status message is formed as "Macro-" + resourceName + "-" + action + " request was executed correctly."
+
+   This status message is updated in the request as well as is set to finalStatusMessage of the execution variable
+
+ c. Other request parameters are updated
+
+  request.setEndTime(endTime);
+
+  request.setFlowStatus("Successfully completed all Building Blocks");
+
+  request.setProgress(Long.valueOf(100));
+
+  request.setRequestStatus("COMPLETE");
+
+  request.setLastModifiedBy("CamundaBPMN");
+
+ d. This new request parameters are updated by a put request to the requestDbclient
+
+
+
+
+Flow ends
+----------
+
+If there are other resources present along with the service : Eg :- Volumegroup.( These BBs wil be specifically called ) 
+
+1) AssignVolumeGroupBB :
+ 
+ a. genericvnfid and volumegroupid is obtained from the execution block.
+ b. volumegroup orchestrationstatus is set to assigned
+ c. a volume group of the above details is created in aai
+ d. connect volumegroup to this genericvnf
+ e. cloud configuration is got, and then the volumegroup is linked to tenant
+
+
+
+2) createVolumeGroupBB :
+
+ a. get the vf details according to Vf module id from sdnc.
+ b. vfmodulequeriedfromsdnc is set to the executionvariable.
+ c. createVolumeGroupRequest is formed with getCloudRegion, serviceinstance, genericVnf, volumegroup, sdncVfModuleQueryResponse.
+ d. calls vnfadapter, which in turn calls openstackadaptertask.
+ e. update heattask in the volumegroup and which is ammended in the aai.
+ f. orchestrationstatus for the volume group is set to created.
+
+
+3) ActivateVolumeGroupBB :
+
+ orchestrationstatus for the volume group is ammended to active.
+
diff --git a/docs/developer_info/Cxf_Logging.rst b/docs/developer_info/Cxf_Logging.rst
new file mode 100644
index 0000000000..ea2bbf56ce
--- /dev/null
+++ b/docs/developer_info/Cxf_Logging.rst
@@ -0,0 +1,210 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright 2020 Huawei Technologies Co., Ltd.
+
+CXF-logging:
+=============
+It is a logging framework from SO. Here basically we are having 2 interceptors which extends AbstractSoapInterceptor.
+
+SOAPLoggingInInterceptor:
++++++++++++++++++++++++++++
+
+* This interceptor is responsible for Capturing requestId , client ip address , invocation id, service name, instance id, entry timestamp , log timestamp, Elapsed time for each request and update the MDC logger with staus In-progress.
+
+SOAPLoggingOutInterceptor:
+++++++++++++++++++++++++++++
+* This interceptor is responsible for log timestamp , elapsed time for each request and checks for if there is any exception update the MDC loggers with 500 response code otherwise update the status as completed.
+
+
+cxf-logging Used By below components of SO:
+++++++++++++++++++++++++++++++++++++++++++++
+The cxf-logging framework is used by below components of so.
+
+mso-openstack-adapter.
+mso-requests-db-adapter.
+mso-sdnc-adapter.
+mso-infrastructure-bpmn.
+
+cxf-logging dependency for using in other components:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
+  
+  <dependency>
+      <groupId>org.onap.so</groupId>
+      <artifactId>cxf-logging</artifactId>
+      <version>${project.version}</version>
+
+    </dependency>
+
+pom.xml:
++++++++++
+<?xml version="1.0"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
+
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+
+    <groupId>org.onap.so</groupId>
+    <artifactId>so</artifactId>
+    <version>1.6.0-SNAPSHOT</version>
+
+  </parent>
+  <name>CXFLogging</name>
+  <description>Common CXF Logging Classes</description>
+  <dependencies>
+
+    <dependency>
+
+      <groupId>org.apache.cxf</groupId>
+      <artifactId>cxf-rt-rs-client</artifactId>
+      <version>${cxf.version}</version>
+
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.cxf</groupId>
+      <artifactId>cxf-rt-bindings-soap</artifactId>
+      <version>${cxf.version}</version>
+
+    </dependency>
+
+    <dependency>
+
+      <groupId>org.apache.cxf</groupId>
+      <artifactId>cxf-rt-transports-http</artifactId>
+      <version>${cxf.version}</version>
+
+    </dependency>
+
+    <dependency>
+
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+
+    </dependency>
+
+    <dependency>
+
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-ext</artifactId>
+
+    </dependency>
+
+    <dependency>
+
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+
+    </dependency>
+
+  </dependencies>
+
+  <build>
+    <resources>
+      <resource>
+        <directory>src/main/resources</directory>
+        <filtering>true</filtering>
+
+      </resource>
+
+      <resource>
+
+        <directory>src/main/java</directory>
+
+        <includes>
+
+          <include>*.java</include>
+
+        </includes>
+
+      </resource>
+
+    </resources>
+
+  </build>
+
+  <artifactId>cxf-logging</artifactId>
+
+</project>
+
+Configuration file:
+++++++++++++++++++++
+Here we can do configure the logger properties for the cxf-logging.
+
+<configuration>
+
+	<property name="p_tim" value="%d{&quot;yyyy-MM-dd'T'HH:mm:ss.SSSXXX&quot;, UTC}"/>
+
+    <property name="p_lvl" value="%level"/>
+
+    <property name="p_log" value="%logger"/>
+
+    <property name="p_mdc" value="%replace(%replace(%mdc){'\t','\\\\t'}){'\n', '\\\\n'}"/>
+
+    <property name="p_msg" value="%replace(%replace(%msg){'\t', '\\\\t'}){'\n','\\\\n'}"/>
+
+    <property name="p_exc" value="%replace(%replace(%rootException){'\t', '\\\\t'}){'\n','\\\\n'}"/>
+
+    <property name="p_mak" value="%replace(%replace(%marker){'\t', '\\\\t'}){'\n','\\\\n'}"/>
+
+    <property name="p_thr" value="%thread"/>
+
+    <property name="pattern" value="%nopexception${p_tim}\t${p_thr}\t${p_lvl}\t${p_log}\t${p_mdc}\t${p_msg}\t${p_exc}\t${p_mak}\t%n"/>
+
+	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+
+		<encoder>
+
+			<pattern>${pattern}</pattern>
+
+		</encoder>
+
+	</appender>
+
+	<appender name="test"
+		class="org.onap.so.utils.TestAppender" />
+
+	<logger name="com.att.ecomp.audit" level="info" additivity="false">
+
+		<appender-ref ref="STDOUT" />
+
+	</logger>
+
+	<logger name="com.att.eelf.metrics" level="info" additivity="false">
+
+		<appender-ref ref="STDOUT" />
+
+	</logger>
+
+	<logger name="com.att.eelf.error" level="WARN" additivity="false">
+
+		<appender-ref ref="STDOUT" />
+
+	</logger>
+
+	<logger name="org.onap" level="${so.log.level:-DEBUG}" additivity="false">
+		<appender-ref ref="STDOUT" />
+
+		<appender-ref ref="test" />
+
+	</logger>
+	
+	<logger name="org.flywaydb" level="DEBUG" additivity="false">
+        <appender-ref ref="STDOUT" />
+
+    </logger>
+
+	<logger name="ch.vorburger" level="WARN" additivity="false">
+		<appender-ref ref="STDOUT" />
+
+	</logger>
+
+	<root level="WARN">
+		<appender-ref ref="STDOUT" />
+		<appender-ref ref="test" />
+
+	</root>
+
+</configuration>
+
diff --git a/docs/developer_info/developer_information.rst b/docs/developer_info/developer_information.rst
index 1b9e83b840..a060da60b0 100644
--- a/docs/developer_info/developer_information.rst
+++ b/docs/developer_info/developer_information.rst
@@ -21,5 +21,6 @@ SO Developer Information
    BPMN_Project_Deployment_Strategy.rst
    BPMN-INFRA_Workflow_Understanding.rst
    Mso_Openstack_Adapter.rst
+   Cxf_Logging.rst
    instantiate/index.rst
    FAQs.rst
diff --git a/docs/developer_info/mso_adapter_restinterface.rst b/docs/developer_info/mso_adapter_restinterface.rst
new file mode 100644
index 0000000000..49a9cadba4
--- /dev/null
+++ b/docs/developer_info/mso_adapter_restinterface.rst
@@ -0,0 +1,288 @@
+Mso-adapters-rest-interface
+---------------------------
+.. image:: ../images/module_structure.png
+
+It mainly contains the payload that is provided to different rest calls in SO
+
+Network
+--------
+# 1. Network contain beans( classes with multiple attributes and thier setters and getters) and their corresponding mappers which will be used by the network adapter of  SO. Contrail networking is used for cloud network automation
+
+Beans
+-----
+ # a. ContrailPolicyRef : this class has following attribute 	
+       private ContrailPolicyRefSeq seq;
+
+       Usage: adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/network/MsoNetworkAdapterImpl.java- while creating network in openstack,  network stack is created depending on stackParams. So if pFqdns(FQDN address object is used in order to use DNS names in firewall policies) are there in the inputrequest to createNetwork, then mergePolicyRefs method is called, where for each input pFqdns, a new ContrailPolicyRef is created and appended to a list. Then this is added as value to stackParams with policy_refsdata as key.
+
+ # b. ContrailPolicyRefSeq : Attributes are
+   private String major;
+
+   private String minor ;
+
+   Usage: adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/network/MsoNetworkAdapterImpl.java- As this is an attribute to the ContrailPolicyRef explained above. So when a new ContrailPolicyRef() is created in mergePolicyRefs method, correspondingly a new ContrailPolicyRefSeq should be created.
+
+ # c. ContrailSubnet – Its a subnetwork having attributes 
+    private ContrailSubnetIp subnet = new ContrailSubnetIp();
+
+    private String defaultGateway;
+
+    private String subnetName;
+
+    private Boolean enableDhcp(dynamic host config);
+
+    private Boolean addrFromStart = true;
+
+    private List<ContrailSubnetPool> allocationPools = new ArrayList<>();
+
+    private ContrailSubnetHostRoutes hostRoutes = new ContrailSubnetHostRoutes();
+
+    Usage : adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/network/MsoNetworkAdapterImpl.java- While creating network mergeSubnetsAIC3 is called if a list of subnets are present. The subnets are mapped to ContrailSubnet using ContrailSubnetMapper, and then are added to the heat template and stackparams which are used for network creation in openstack.
+
+ # d. ContrailSubnetHostRoute : This is an attribute defined in contrailsubnet and has following attributes
+    private String prefix;
+
+    private String nextHop; 
+
+    Usage : This is an attribute of ContrailSubnetHostRoutes , which is used within the contrailSubnet and thus is used in network creation and updation.
+
+ # e. ContrailSubnetHostRoutes : This class is used to store an list of ContrailSubnetHostRoute 
+
+    private List<ContrailSubnetHostRoute> hostRoutes = new ArrayList<>();
+
+    Usage : attribute of contrailSubnet
+
+ # f. ContrailSubnetIp : attributes are
+     private String ipPrefix;
+
+     private String ipPrefixLen; 
+ 
+     This class is used to store the cidr value , which is used as a interrouting table, taking as ipaddress/total no . Eg : 10.0.0.0/24 means starting ip is 10.0.0.0, and total no of ip address possible here is 256 (2^(32-24)), the last address being 10.0.0.255.
+
+     Usage : important attribute of contrailSubnet
+
+ # g. ContrailSubnetPool : attributes are starting and ending ip address of the subnet
+    private String start;
+
+    private String end;
+
+    Usage: a list of ContrailSubnetPool forms an important attribute of contrailSubnet
+
+Mappers
+-------
+
+ # a. ContrailSubnetMapper : It is used to map the inputsubnet to a contrailSubnet
+   public ContrailSubnetMapper(Subnet inputSubnet) {
+        this.inputSubnet = inputSubnet;
+
+    }
+
+   The map method within is used for the mapping. Here first a contrailSubnet is created, and depending on whether the subnet has name or id, the contrailSubnet’s name is initialized, then if it has cidr , then a contrailSubnetIp is created, and is added into it, which is then added to contrailSubnet created before. Depending on whether input has allocationpool or hostroutes, these are casted into ContrailSubnetPool and ContrailSubnetHostRoute using ContrailSubnetPoolMapper and ContrailSubnetPoolMapper respectively.
+
+   Usage: adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/network/MsoNetworkAdapterImpl.java :The subnets are mapped to ContrailSubnet using ContrailSubnetMapper, and then are added to the heat template and stackparams which are used for network creation
+
+ # b. ContrailSubnetPoolMapper : It is used to map the pool within the subnets to contrailSubnetPool. Used within contrailSubnetMapper. Here, the particular pool is added only if it has both the start and end ip address. 
+
+ # c. ContrailSubnetHostRoute : It is used to map the host routes within the subnets to contrailSubnetHostRoute. Used within contrailSubnetMapper. Here, the particular host route is added if either of the next hop or ip prefix is defined.
+
+Network request
+---------------
+
+#2. Network request : It contains the payloads for different types of network requests
+
+ # a. ContrailNetwork :
+    private String shared = "false";
+
+    private String external = "false";
+
+    private List<RouteTarget> routeTargets;
+
+    private List<String> policyFqdns;
+
+    private List<String> routeTableFqdns;
+
+    Usage: contrailNetwork is an important attribute of CreateNetworkRequest, So is to be used where all the request to createNetwork is required.
+
+  # 1. adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/tasks/orchestration/StackService.java : Here the input to createNetwork requires contrailNetwork parameter, so here it checks whether  contrailNetwork is already present, if not a new is created.
+
+  # 2.bpmn/so-bpmn-tasks/src/main/java/org/onap/so/client/adapter/network/mapper/NetworkAdapterObjectMapper.java : Here in createNetworkRequestMapper, createNetworkRequest is formed where in buildContrailNetwork, a new contrailNetwork is created and initialized. This request is used to create a network and set the corresponding execution variable   
+
+ # b. CreateNetworkError: It extends NetworkExceptionResponse. And is used when an error occurs during network creation
+
+ # c. NetworkExceptionResponse : it extends NetworkResponseCommon. Attributes are 
+    private String message;
+
+    private MsoExceptionCategory category;
+
+    private Boolean rolledBack; 
+
+ # d. NetworkResponseCommon: Attribute is 
+    private String messageId; 
+
+ # e. CreateNetworkRequest: extends NetworkRequestCommon
+    private String cloudSiteId;
+
+    private String tenantId;
+
+    private String networkId;
+
+    private String networkName;
+
+    private String networkType;
+
+    private String networkTypeVersion;
+
+    private String modelCustomizationUuid;
+
+    private String networkTechnology = "NEUTRON";
+
+    private List<Subnet> subnets;
+
+    private ProviderVlanNetwork providerVlanNetwork;
+
+    private ContrailNetwork contrailNetwork;
+
+    private Boolean failIfExists = false;
+
+    private Boolean backout = true;
+
+    private Map<String, String> networkParams = new HashMap<>();
+
+    private MsoRequest msoRequest = new MsoRequest();
+
+    private boolean contrailRequest;
+
+    Usage :
+    #1) bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/aai/tasks/AAIQueryTasks.java:  Here in getNetworkVpnBinding, where VPN Binding data from AAI result is extracted. There in routeTargets is got, and is updated in the execution variable(“createNetworkRequest”).
+
+    #2)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/adapter/network/tasks/NetworkAdapterCreateTasks.java – Here in createnetwork returns a CreateNetworkRequest which is updated in execution variable(“networkAdapterRequest”)
+
+    #3)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/flowspecific/tasks/CreateNetwork.java - 
+    Here in createnetwork returns a CreateNetworkRequest which is updated in execution variable(“createNetworkRequest”)
+
+    #4) bpmn/so-bpmn-tasks/src/main/java/org/onap/so/client/adapter/network/NetworkAdapterClientImpl.java -Here createNetwork request is processed as a restclient post process with CreateNetworkRequest as input.
+
+ # f. CreateNetworkResponse : extends NetworkResponseCommon
+    private String networkId;
+
+    private String neutronNetworkId;
+
+    private String networkStackId;
+
+    private String networkFqdn;
+
+    private Boolean networkCreated;
+
+    private Map<String, String> subnetMap;
+
+    private NetworkRollback rollback = new NetworkRollback();
+
+    Usage:
+    #1)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/aai/tasks/AAIUpdateTasks.java :here after the network is created, the l3 network is updated with those parameters which come from execution variable("createNetworkResponse")
+
+    #2)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/adapter/network/tasks/NetworkAdapterCreateTasks.java – depending on variable networkCreated of response, networkAdapterCreateRollback is set to true. 
+
+    #3)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/client/adapter/network/NetworkAdapterClientImpl.java -Here createNetwork request is processed as a restclient post process with CreateNetworkRequest as input and CreateNetworkResponse as output 
+
+ # g.DeleteNetworkError : extends NetworkExceptionResponse
+
+ # h. DeleteNetworkRequest:extends NetworkRequestCommon
+    private String cloudSiteId;
+
+    private String tenantId;
+
+    private String networkId;
+
+    private String networkStackId;
+
+    private String networkType;
+
+    private String modelCustomizationUuid;
+
+    private MsoRequest msoRequest = new MsoRequest();
+
+    Usage: 
+    #1)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/adapter/network/tasks/NetworkAdapterDeleteTasks.java – deleteNetworkRequestMapper returns a DeleteNetworkRequest, which is set to the execution variable(“networkAdapterRequest”)
+
+    #2)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/client/adapter/network/NetworkAdapterClientImpl.java - Here deleteNetwork request is processed as a restclient delete process with DeleteNetworkRequest as input.
+
+    #3)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/client/adapter/network/mapper/NetworkAdapterObjectMapper.java – Here the deleteNetworkRequestMapper forms DeleteNetworkRequest object 
+
+  Similarly others are also implemented and used
+ 
+.. image:: ../images/nwrest.png
+
+Sdnc request
+------------
+
+#3. Sdnc request -These are required by the mso-sdnc-adapter
+
+ # a. RequestInformation – This is an important parameter of SDNCServiceRequest. Thud is used during the conversion of SDNCServiceRequest to XMLstring.
+
+ # b. ServiceInformation – This stores the important information like serviceId, servicetype and SubscriberName. Its parameter of SDNCServiceRequest.
+
+ # c. SDNCErrorCommon – it extends SDNCResponseCommon . 
+ 
+  Usage : adapters/mso-sdnc-adapter/src/main/java/org/onap/so/adapters/sdnc/sdncrest/SDNCServiceRequestConnector.java – catching exception if any happens during request creation and a new SDNCErrorCommon is created.
+
+ # d. SDNCRequestCommon – SDNCServiceRequest extends SDNCRequestCommon. It has some attributes like bpNotificationUrl(Endpoint on which BPMN can receive notifications from the SDNC adapter), bpTimeout ans sdncrequestId.
+
+ # e. SDNCServiceRequest
+  Usage: adapters/mso-sdnc-adapter/src/main/java/org/onap/so/adapters/sdnc/sdncrest/SDNCServiceRequestTask.java – Here the runRequest is happening, where we are posting this request using a restclient call with SDNCServiceRequest as input.
+
+ # f. SDNCServiceResponse and SDNCServiceError 
+  Usage:adapters/mso-sdnc-adapter/src/main/java/org/onap/so/adapters/sdnc/sdncrest/SDNCServiceRequestTask.java – Here if the above runRequest returns a 2xx response code then a corresponding SDNCServiceResponse is created and returned or else SDNCServiceError is created and returned
+
+Tenant request
+---------------
+
+#4. These provide classes to be used by the so-adapters.tenant.
+
+The operator of a cloud can present unchangeable networks to the users, or give users the option to create, delete, connect and generally manipulate networks. The latter type of networks is called “tenant networks”.
+
+Used in adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/tenant/TenantAdapterRest.java
+
+The implementation and usage is similiar to the above classes
+
+.. image:: ../images/tenantrest.png
+
+VDU
+---
+
+#5. Vdu – these are used for the deployment and management of (cloud-agnostic) VDU . The abstract classes for instantiation of vdu, query vdu, delete vdu, update vdu are defined in here.
+
+These are implemented in adapters/mso-adapter-utils/src/main/java/org/onap/so/cloudify/utils/MsoCloudifyUtils.java and adapters/mso-adapter-utils/src/main/java/org/onap/so/openstack/utils/MsoHeatUtils.java
+
+Vnfrest
+-------
+
+#6. Vnfrest – These are used to manage vnfs and vgs.
+These are used in the project similiar to networkrest
+Foreg : Usage of DeleteVfModuleRequest: 
+
+1)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/bpmn/infrastructure/adapter/vnf/tasks/VnfAdapterDeleteTasks.java – Here in deleteVfModuleRequestMapper creates a new DeleteVfModuleRequest, and is set to the execution variable(“VNFREST_REQUEST” ) and “deleteVfModuleRequest” execution variable is set true
+
+2)bpmn/so-bpmn-tasks/src/main/java/org/onap/so/client/adapter/vnf/VnfAdapterClientImpl.java -  Here a delete rest request is send
+
+.. image:: ../images/vnfrest.png
+
+
+OPENSTACK
+---------
+Openstack is classified into beans, exceptions, and mappers
+
+MAPPERS
+-------
+ # 1) JAXBContext: It is used to convert a object to xml(marshalling) and to convert xml to object (unmarshalling) . These marshalling and unmarshalling are overriden in the map adapters in mappers.
+
+ # 2)NetworkInfoMapper – used to Capture the data from a Neutron Network object and cast it into a networkInfo( present in beans of openstack). Here in vlan information is located depending on network.getProviderNetworkType() , and if not then the segments within the network is iterated and is checked for the same.
+  Usage: It is used in adapters/mso-adapter-utils/src/main/java/org/onap/so/openstack/utils/MsoNeutronUtils.java , where on createNetwork, queryNetwork and updateNetwork , the network is mapped by  NetworkInfoMapper into networkInfo and returned.
+
+ # 3) StackInfoMapper – used to Capture the data from a Stack object and cast it into a stackInfo( present in beans of openstack). 
+  Usage: It is used in adapters/mso-adapter-utils/src/main/java/org/onap/so/openstack/utils , where all createStack, queryStack, updateStack, deleteStack is done, a new instance of stackInfo is returned
+
+Exceptions
+----------
+These are set of msoexceptions provided, and would be used depending on what exception needs to be handled
+
+.. image:: ../images/msoexception.png
diff --git a/docs/images/AssignServiceInstanceBB.png b/docs/images/AssignServiceInstanceBB.png
new file mode 100644
index 0000000000..d1dbb038aa
--- /dev/null
+++ b/docs/images/AssignServiceInstanceBB.png
diff --git a/docs/images/ExecuteBuildingBlock.png b/docs/images/ExecuteBuildingBlock.png
new file mode 100644
index 0000000000..7c8256ca3f
--- /dev/null
+++ b/docs/images/ExecuteBuildingBlock.png
diff --git a/docs/images/flowchart.png b/docs/images/flowchart.png
new file mode 100644
index 0000000000..cbb9aef1f2
--- /dev/null
+++ b/docs/images/flowchart.png
diff --git a/docs/images/module_structure.png b/docs/images/module_structure.png
new file mode 100644
index 0000000000..c25441bd8e
--- /dev/null
+++ b/docs/images/module_structure.png
diff --git a/docs/images/msoexception.png b/docs/images/msoexception.png
new file mode 100644
index 0000000000..b9d2dfd5da
--- /dev/null
+++ b/docs/images/msoexception.png
diff --git a/docs/images/nwrest.png b/docs/images/nwrest.png
new file mode 100644
index 0000000000..58b66d59e0
--- /dev/null
+++ b/docs/images/nwrest.png
diff --git a/docs/images/tenantrest.png b/docs/images/tenantrest.png
new file mode 100644
index 0000000000..ec1c77e61b
--- /dev/null
+++ b/docs/images/tenantrest.png
diff --git a/docs/images/vnfrest.png b/docs/images/vnfrest.png
new file mode 100644
index 0000000000..f61720708d
--- /dev/null
+++ b/docs/images/vnfrest.png
diff --git a/docs/images/workflow.png b/docs/images/workflow.png
new file mode 100644
index 0000000000..a62a4e6496
--- /dev/null
+++ b/docs/images/workflow.png