Updating a subscription -- clarify how this works.

[isaacvetter]

During the HL7 Sept FHIRcast connectathon track, @wmaethner , Bas, and I talked through -

When creating a new subscription for the same topic and callback url as an existing subscription,

• is the client required to unsibscribe from the initial subscription? No
• is the hub responsible for notifying client of ending of first subscription? No

Need to clarify that the Hub responds as part of the intent verification with the events that a subscriber is successfully using.

For websockets new subscriptions for the same topic should be on new websocket connections (we think).

[gkustas]

In what scenario would more than one client be sharing the same callback?

[wmaethner]

Hey @gkustas, multiple clients shouldn't have the same callback, it should be unique. The situation we were thinking of was where the client makes a subscription, but then later wants to add or change the events it is subscribed to (e.g. they subscribe to patient events, then later want to also subscribe to study events). In that case it will be the same topic and callback.

[gkustas]

Ahhh. That makes sense. I'll need to check my him implementation to make sure that works

…

On Sun, Sep 15, 2019, 10:43 AM Will Maethner ***@***.***> wrote: Hey @gkustas <https://github.com/gkustas>, multiple clients shouldn't have the same callback, it should be unique. The situation we were thinking of was where the client makes a subscription, but then later wants to add or change the events it is subscribed to (e.g. they subscribe to patient events, then later want to also subscribe to study events). In that case it will be the same topic and callback. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#287?email_source=notifications&email_token=ABODZ3VEM7LSFMNUNFAE4N3QJZCY5A5CNFSM4IWXHRD2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD6XSE4Q#issuecomment-531571314>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABODZ3WIYGRFUKJOFJGZIJTQJZCY5ANCNFSM4IWXHRDQ> .