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#	Issue	Notes	Decisions
1	Delete the subscription from the database?	When do we actually delete the subscription from CPS DB ? We plan to do it when we receive response from the DMI plugins and the underlying subscriptions from the devices are deleted.
2	What do we need to send to the DMI Plugin so that they are able to decide that how to delete the ongoing subscription.	subscription name + client id + cmhandle ids? + cmhandle properties? + datastore?
3	The subscription delete request should be able to retry and make sure the subscriptions are deleted from the respective DMIs managing the devices.	kieran mccarthy The agenda for the next meeting. We can decide then. More on the "DELETING" stage ( if we want to have it )	kieran mccarthy As discussed on 17 Jul 2023 , The DME should be able to maintain Subscription State and make decision when to retry based on the response outcome we provide to it for create and/or delete use cases.
4	DME to NCMP Event to have targets and datastore-xpath-filter information for the subscription delete use case ?		kieran mccarthy As per the discussion today 25 Jul 2023 we agreed to use targets , datastore-xpath-filters and datastores for the subscription delete use case.
5	Do we send additional properties from NCMP to DMI	Are additional properties needed to delete the subscription

Overview

We receive an event of type : subscriptionDeleted from the client ( DME ) containing the subscription clientId and subscription name along with datastore and dataCategory details ( DMEtoNCMP )
We check in NCMP that we have an ongoing subscription using clientId and subscriptionName.
If we have ongoing subscription , we forward the event to dmi-plugins so that the changes are applied in the devices managed by dmi-plugin as well. ( Impl. Proposal CM Event Subscription LCM: Delete )
Now if the dmi-plugins have applied the request then we get an event back from dmi-plugin and NCMP will process that event and based on that it will delete the ongoing subscription request from the database itself. If the response from DMI plugins is accepted ( i.e it can delete the subscriptions from the underlying devices and no subscription delete request are in PENDING or REJECTED state )Then we delete the subscriptions from the DB as well. ( Impl. Proposal CM Event Subscription LCM: Delete )
After processing the received event from DMI , NCMP will send the final event to the client (DME). ( Impl. Proposal CM Event Subscription LCM: Delete )

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topic: dmi-ncmp-cm-avc-subscription

id uuid - generated by dmi-plugins
source <dmiName>
specversion "1.0"
type subscriptionDeletedStatus
time - generated by dmi
correlationid: clientId:subscriptionName
dataschema org.onap.ncmp.dmi.cm.subscription:1.0.0
data
{
   "clientId":"SCO-9989752",
   "subscriptionName":"cm-subscription-001",
   "dmiName":"<dmiName>",
   "subscriptionStatus":[
      {
        id : <cmhandleid>,
        status : rejected | accepted | pending,
        details : <some message> // only present for rejected
    },
      {...}
   ]
}

"javaType": "org.onap.cps.ncmp.events.avcsubscription1_0_0.dmi_to_ncmp"

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topic: subscription-response

id uuid - generated by NCMP
source <NCMP>
specversion "1.0"
type subscriptionDeletedStatus
time // NCMP would generate
correlationid: clientId:subscriptionName
dataschema org.onap.ncmp.cm.subscription:1.0.0
{
  "data": {
       “statusCode” : 207, # Some error code reflecting partial success. **   // To be discussed with the whole team
       “statusMessage” : “Partially Applied Subscription”,
       “additionalInfo” : {
           “rejected” : [{
                “details” : “faulty subscription format for target(s)”, // need to finalize the detailed message for grouping.
                “targets” : [“cmhandle1”, “cmhandle2”, “cmhandle3”]
           },
            {
                “details” : “faulty subscription format for target(s) - xyz”, // need to finalize the detailed message for grouping.
                “targets” : [“cmhandle1”]
           }
],
           “pending” : {
                “details” : “EMS/node connectivity issues, retrying”,
                “targets” : [“cmhandle4”, “cmhandle5”, “cmhandle6”]
       }
  }
}

// we dont have to send the accepted cmhandle details.

** 202 could indicate complete failure –
    "data": {
       “statusCode” : 406, # Some error code reflecting complete rejection of the request
       “statusMessage” : “Subscription rejected : Faulty Subscription Data”,
       “additionalInfo” : {
           “rejected” : {
                “details” : “//NRxxCellDU is not a valid subscription type”
           },

Have another for Pending CMHandles gone to accepted

"javaType": "org.onap.cps.ncmp.events.avcsubscription1_0_0.ncmp_to_client"

DB Logic for subscription delete handling forwarding

NCMP receives a subscription delete request
IF subscription exists
1. Set last operation enum to delete

CMHANDLE1:

CMHandle2:

CMHandle3:

DB Logic for subscription delete handling

NCMP receives subscription delete response from DMI Plugins
If all DMIs have responded within 30 seconds:
1. delete subscription from db and send subscription delete accepted response to client
If some DMIs respond within 30 seconds
1. update subscription with pending for the DMIs which have not responded, for the DMIs which have responded, remove those CMHandles from the subscription db
2. send response to clients
3. wait for DMIs to respond, update db according to DMI response and respond to client
NCMP checks the existing create subscription object in db
1. If cmhandle is accepted, delete cmhandle is pending
2. If cmhandle is rejected, delete cmhandle is rejected with message like "create subscription was rejected originally"
3. If cmhandle is pending, delete cmhandle is rejected with message like "create subscription for cmhandle is pending"
NCMP persists subscription delete in db
NCMP forwards subscription delete to the pending delete operation cmhandle's dmi plugins.
NCMP listens for DMI responses and updates subscription delete in db
1. If all respond then send NCMP to ClientApp response
2. If not all respond then send response after 30 seconds
Check if subscription create and subscription delete match states for all cmhandles then the subscriptions can be deleted from the db
If Delete is requested again by client apps
1. Create State Delete State NCMP action
  1 Accepted Accepted Nothing
  2 Accepted Rejected Delete for that cmhandle once
  3 Accepted Pending Delete for that cmhandle once
  4 Rejected Rejected Nothing
  5 Pending Rejected Nothing
2. See step 5.
If all DMIs respond but some are rejected,
1. remove dmis which have been accepted and mark rest as rejected.
2. send response to clients

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Old Version 36

New Version 37

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Overview

DB Logic for subscription delete handling forwarding

DB Logic for subscription delete handling

	Create State	Delete State	NCMP action
1	Accepted	Accepted	Nothing
2	Accepted	Rejected	Delete for that cmhandle once
3	Accepted	Pending	Delete for that cmhandle once
4	Rejected	Rejected	Nothing
5	Pending	Rejected	Nothing