FHIR Chat · multiple criteria

Stream: subscriptions

Topic: multiple criteria

Eric Haas (Jan 23 2019 at 18:00):

The Subscription documentation suggests that multiple criteria are possible in a single Subscription resource...

The criteria are Search strings that ...

But no guidance or instruction how to delimit the strings. For example for a provider directory push to a local directory, I would like to query for the all the updated Practitioners, PractitionerRoles and Endpoints in a single subscription.

Practitioner?address-postalcode=[zip list]
PractitionerRole?practitioner.address-postalcode=[zip list]
Endpoint?_has:PractitionerRole:endpoint:practitioner.address-postalcode=[zip list]

something like...

{
  "resourceType": "Subscription",
  "id": "vhdir-connectathon-scenario-12",
  "status": "requested",
  "contact": [
    {
      "system": "phone",
      "value": "ext 4123"
    }
  ],
  "end": "2020-01-01T00:00:00Z",
  "reason": "(push) healthcare directory data to multiple local directories",
  "criteria": "Practitioner?address-postalcode=[zip list],PractitionerRole?practitioner.address-postalcode=[zip list],Endpoint?_has:PractitionerRole:endpoint:practitioner.address-postalcode=[zip list]",
  "channel": {
    "type": "rest-hook",
    "endpoint": "https://directory.com/sub-endpoint",
    "payload": "application/fhir+json",
    "header": [
      "Authorization: Bearer secret-token-abc-123"
    ]
  }
}

spaces, commas? am I interpreting this correctly?

Grahame Grieve (Jan 23 2019 at 18:20):

that's misleading language. It's a set of search parameters in a single string

Eric Haas (Jan 23 2019 at 20:59):

so within the string are the set of search parameters separated by a space?

Grahame Grieve (Jan 23 2019 at 21:57):

no a single normal search string

Eric Haas (Jan 23 2019 at 22:18):

let me restate this.. I want all the updated Practitioners, PractiionerRoles and Endpoints. Since this isn't possible in a single search expression - do I need 3 separate Subscriptions?

Grahame Grieve (Jan 23 2019 at 22:21):

I think so

Grahame Grieve (Jan 23 2019 at 22:22):

is there anything else?

Eric Haas (Jan 23 2019 at 23:39):

I'd like to know from others whether or not is appropriate to have multiple criteria in a single subscription. If I'm a directory, I'd like all the information pushed at once in a single bundle e.g for referential integrity i'd expect the new Practitioner and all her PractitionerRoles and Endpoints to come as a bundle... @Brian Postlethwaite ?

Grahame Grieve (Jan 24 2019 at 10:09):

It wouldn’t make many difference. You’d get individual resources either way, and you can use multiple subscriptions for the same channel

Eric Haas (Jan 24 2019 at 16:38):

OK I misunderstood how the REST Hook works, to clarify: The subscription resource is based upon a single search string. The subscription service " forwards" ( e.g. updates) a copy of each individual resource to the nominated endpoint aka FHIR Server ( for the sake of argument - a middleman server) as opposed to rebundling a resultant search bundle as a batch and batching it. The Subscriber would then pull from the middleman server at its leisure. With a middleman this workflow is more like directed polling than pure push. if I described this correctly , I think it would be helpful to create trackers for:

flesh out an example rest hook workflow a little more in the spec with pretty diagrams etc
clarify the text to state one search: one subscription resource
clarify that the payload is a resource and not a (search bundle) if that is true

Eric Haas (Jan 24 2019 at 16:41):

BTW TY @GG

Grahame Grieve (Jan 24 2019 at 19:50):

depends on whether there's a payload or not - no payload = directed polling. Payload = push

Last updated: Apr 12 2022 at 19:14 UTC

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FHIR Chat · multiple criteria · subscriptions