Subscription and Notification Pattern

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Introductory text

Functional Variants of the Subscription and Notification Pattern

Two distinct business requirements for Subscription and Notification Pattern: Updating of previously shared Evidence or being informed about an Event

Technically also two different approaches to Notification: Sending updated Data of a defined Evidence type or Event Notifications that contain only the identification data and the event type. Technical approach and business requirement do not relate one two one, giving rise to potential hybrid approaches.

Event The reference Architecture for the DE4A projects focusses the Subscription and Notification Pattern on Event Notification, which can be combines with the Lookup Pattern to cover the updating previously shared evidence use case. [23-04-2021: tables below still represent a hybrid approach and need rework]

Working Hypotheses

Business Process

Event Subscription

Business Process (picture)

Activity Table

Activity / UC Role Type* Description
Trigger initiate subscription eProcedure User The eProcedure leads at the side of the data-evaluator to either the registration of the represented company or the registration of a branch of the represented company (the parent-company of the branch).

A successful registration of the company or the branch of the company leads to a subscription to business events of the represented company. This is needed to assess impact of these business events on service delivery to the company or the branch.


The  subscription process can also be triggered for technical reasons: for instance to resend subscription requests because an error occurred at DO-side.

Initiate subscription DE Service Initiate subscription:
  • Collect data and formulate subscription need:
    • company identifier
    • all events of subset/type of events (specific event catalogue)? tbd
    • type of action: subscribe
    • period of subscription? tbd
  • Forward to Data requestor (if applicable)


Note: subscriber should unsubscribe and re-subscribe if participant-id changes. To be able to do so, subscriptions have to be registered at the DE.

Trigger cancel subscription eProcedure / Public service / Notification Service Potential triggers to cancel a subscription are:
  • Public service: the delivery of an public service can lead to the need to cancel the subscription (the public service has ended, e.g. a multi-year subsidy procedure, the country can decide to cancel the  branch-office registration).
  • eProcedure: the user can also withdraw from service and thereby initiating cancellation of the subscription?
  • Notification: after receiving a notification the assessment can be that the subscription is no longer needed (exception flow).
  • Technical reasons: for instance an error at the DO-side could lead to the need to resend the request to cancel a subscription.
Cancel subscription DE Service Cancel subscription:
  • Collect data and formulate cancel subscription need:
    • company identifier
    • all events of subset/type of events (specific event catalogue)? tbd
    • type of action: cancel subscription
    • specific end-date of the subscription? tbd
  • Forward to Data requestor (if applicable)
Lookup event provider routing information DR Service Lookup information on competent authority that facilitates subscription service (metadata tbd)


(should data requestor resolve participant id dynamically? Not needed, participant id is stable enough)

Inform National Coordinator that un-subscription was not successful DR User In case of the cancellation of a subscription there is a slight chance the participant ID of DO has changed: a manual process deals with this (unhappy) flow.
Send (un)subscription request DR Service Send the request to subscribe or unsubscribe to the DT.
Forward (un)subscription error DR Service Forward (un)subscription error message received from DT to DE
Investigate reason for (un)subscription error DE User Analyse error and take appropriate actions (error could be on side of DE of DO) (exception so no need to model this in detail)
Forward confirmation DR Service Forward the confirmation on the (un)subscription request (received from the DT) to the DE.
Log (un)subscription information DE Service The confirmation is logged to complete the audit trail.

Note: register in a way that it is easily readable (optional: include subscription id).

Validate (un)subscription request DT Service Technical validation including forwarding to data owner. Technical exception out of scope
Evaluate (un)subscription request DO Service Functional check of request to subscribe: does company exists, are type of events/subscription supported, is DE authorized.

Functional check of request to unsubscribe: does subscription exists.

If the request does not pass the functional check, the request is rejected.

Prepare (un)subscription error message DO Service Collect the content (mainly the link to the request and the error message) and send it to DT
Send (un)subscription error message DT Service Forward to DR
Register (un)subscription DO Service Data owner creates/ends the DE’s subscription on the company’s events.

Remarks:

  • If messages resemble BRIS messages that would avoid extra work to be done; because this mechanism is in already in place
  • Harmonised set of business events possibly needed.
  • Register on evidence type: tbd
Confirm (un)subscription DO Service Create a confirmation: (un)subscription result (success), timestamp, link to (un)subscription request and send to DT (if applicable)
Send (un)subscription confirmation DT Service Send confirmation to DR


Log confirmation

  • A / M = Automated or Manual

Event Notification

Business Process (picture)

Activity / UC Role Type Description
Trigger Change in registered company Company representative / SP User An event regarding the company triggers the notification process. This event can be initiated by:
  • a representative of the company itself, e.g.: merger, change of owner.
  • a public service, e.g.: change of postal code, death of representative, court of law ruling.
Change company registration DO User Standard process of the Data Owner - Business Register - to process changes in company registration as a result of the business event.
Identify DE4A event DO Service The DO determines the DE4A Business event name.


Note that the DO must have a mapping of it's own business events to the list of DE4A business events.

Check subscription DO Service Check the subscription register for subscribers to the company that is the subject of the business event:
  • No active subscriptions: end of process
  • Active subscriptions found: continue notification process
Extract evidence DO Service Delete this step. (sending evidence or changed data is another type of notification process)
Prepare notification message and subscriber list DO Service Make a list of the subscribers to notify and create the payload of the notification, mainly the DE4A business event name and the timestamp the event took place.
Resolve service metadata DT Service Move from a list of subscribers to single notifications (one for each subscriber) and lookup the routing information for each notification.
Resolve subscriber participant ID and inform National Coordinator DT User If address / DE participant id is not found in the metadata, manual action is needed: contact DE / MS of participant id to analyse the exception and take appropriate measures.
Request from DE to resend event notifications DE User Exception flow for missed notifications (failed or non-failed): if a DE misses notifications a resend of notifications can be requested.
Resend past event notifications DT User The resending of previously sent notifications requires a manual action at the DT.
Send event notification DT Service Send notification, receive the acknowledgement that the notification has been received by the DR and update the audit log with both the event notification and the acknowledgement.
Validate event notification DR Service DR performs a technical validation of the event notification and forward it to the DE. A technical exception flow is out of scope of this process description.


Log received message as part of audit trail?

Determine event response DE Service Check the notified business event and determine the action to be taken.

Note that every determination result is logged as a part of the audit trail or for internal reasons:

  • Company identifier
  • Notified event
  • Request id
  • Determined response
  • Timestamp of determination
Request unsubscription DE Service When the company cannot be identified or is no longer active. Afterwards this will have to be analysed this to find the cause of this apparently wrong subscription and to take appropriate measures.
Dismiss event DE Service The business event is not relevant for the DE and is dismissed. No further actions need to be taken.
Update company information DE Service THe lookup pattern is triggered to request a new copy of the Company Registration Evidence.
Identify business responses and notify responsible party DE User Notify responsible party or organizational unit (that then contacts the company if needed).

Depends on process, case by case, if this can be automated or manually.


Note:

  • A functional response from DE to DO, for example to inform that appropriate actions have been taken, are out of scope of DE4A / OOP TS (it is part of BRIS requirements though). Check.
  • Notifications from DE to DO (resulting from changes in the branch registration) are out of scope of DE4A / OOP TS.

Process Realization

?All on one Page or do we create sub-pages for Business Process and Process Realization?

Used by the following use cases

DBA (UC2)

Application collaborations

TBD

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