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Priyank Maheshwari

Priyank Maheshwari

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Issue

Notes

Decisions

1

Delete the subscription from the database?

  1. 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.

2What do we need to send to the DMI Plugin
  1. subscription name + client id
  2. + cmhandle ids?
  3. + cmhandle properties?
  4. + datastore?

Overview

  1. We receive an event of type : subscriptionDeleted from the client ( EDM ) containing the subscription clientId and subscription name along with datastore and dataCategory details.
  2. We check in NCMP that we have an ongoing subscription using clientId and subscriptionName.
  3. 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.
  4. 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.
  5. After processing the received event from DMI , NCMP will send the final event to the client (EDM).

Subscription Delete Sequence Diagram

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