201809 FHIR Subscriptions

FHIR Subscriptions

Dedicated Zulip chat stream for this track.

• Track orientation slides: https://docs.google.com/presentation/d/1Qh8ZxVJ6aIelYhklz1y-agPXpzohc9MNiOVOIU_w4Sc/edit?usp=sharing

Previous Subscriptions Connectathons

• 201709 FHIR Subscriptions, September 2017, San Diego, CA
• 201801 FHIR Subscriptions, January 2018

Submitting WG/Project/Implementer Group

FHIR-I

Justification

This track is an important step in advancing the maturity of the interactions and resources associated with FHIR Subscriptions.

The subscription pub/sub pattern enables FHIR clients to retrieve data from a server without performing a more expensive periodic polling queries.

Proposed Track Lead

See Connectathon_Track_Lead_Responsibilities

Jenni Syed

FHIR version

September 2018 Ballot: http://hl7.org/fhir/2018Sep/subscription.html

Expected participants

Cerner, Jenni Syed & Max Philips

Roles

FHIR Server

The FHIR Server supports the Subscription resource and notifying subscribed clients of changes.

• Must expose a Subscriptions resource supporting read, create and update.
• Must also act as a client to send notifications.

Subscribing client

Subscribes to FHIR server and gets updates.

• Must create a Subscriptions instance on external FHIR server.
• Must expose an endpoint to accept notifications.

Scenarios

Create FHIR Subscription

Action: Subscribing client creates a Subscription instance on FHIR Server.

Precondition: n/a

Success Criteria: Subscribing client POSTs new subscription resource to FHIR server specifying a criteria and a channel.type of rest-hook. FHIR Server persists active subscription resource. Subscribing client can read newly created Subscription.

Bonus point: Subscribing client updates Subscription instance's status element to _off_ once the subscription is no longer needed. FHIR server respects this setting.

REST Hook notifies client

Action: FHIR Server notifies Subscribing client by POSTing to the endpoint identified in the subscription resource instance.

Precondition: Create FHIR Subscription scenario

Success Criteria: FHIR server POSTs when the criteria in the Subscription is met within the FHIR server.

Argonaut Patient Scheduling prefetch

Subscribe to Schedule using Argonaut extension

Action: Client subscribes to Schedule per Argonaut Patient Scheduling IG.

Precondition: n/a

Success Criteria: Subscribing client POSTs new subscription resource, including Schedule identifier in _criteria to FHIR server. Subscription.channel.type is rest-hook and Subscription.channel.payload is application/fhir+json. FHIR Server persists active subscription resource. Subscribing client can read newly created Subscription.

Notify client of Slot change

Action: FHIR Server notifies subscribers by POSTing a Schedule resource to the endpoint identified in the subscription, according to Argonaut Patient Scheduling.

Precondition: FHIR Subscription created.

Success Criteria: FHIR server POSTs a FHIR Schedule for the modified Slot, to the subscribing client when the criteria is met in the FHIR server.

Bonus point: Subscriber subsequently fetches Slots associated with Schedule from notification.

Notes

Please discuss/explore this tracker issue: [1]