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Async XDS.b. Problem Statement IHE XDS.b implies synchronous communication between actors: Document consumers, sources, registries and repositories. While.

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Presentation on theme: "Async XDS.b. Problem Statement IHE XDS.b implies synchronous communication between actors: Document consumers, sources, registries and repositories. While."— Presentation transcript:

1 Async XDS.b

2 Problem Statement IHE XDS.b implies synchronous communication between actors: Document consumers, sources, registries and repositories. While this can work in a tightly controlled environment, it is generally sub-optimal in environments where multiple intermediaries are present or where a high latency occurs.

3 Key Use Cases Scenario 1: Async XDS allows for scenarios where actors are not simultaneously connected (off-line) making store-and-forward scenarios possible through the use of intermediaries. Scenario 2 (on demand query): In the integrated document source/document repository the XDS document is retrieved from off-line storage and persisted. Allowing for Async responses reduces the time that the document source is left hanging waiting for a response. Scenario 3: Async XDS allows for multiple responses for the same request: pagination of results (return x records at a time), streaming of documents (return x Kilobytes at a time). Scenario 4: In XCA, the gateway can issue separate queries to the federated affinity domains in parallel without having to hang until each one is satisfied. Responses can be received asynchronously and collated for the requestor. The response time will be shortened as the results are retrieved in parallel instead of sequentially.

4 Standards & Systems The XDS.b Asynchronous Profile uses the same standards as the XDS.b Profile. Key enabler for Async communication is WS-Addressing that allows for: – Specification of the reply-to endpoint where responses should be sent – Specification of the SOAP message id to allow for correlation of responses to the original requests

5 Summary Technical Approach Transactions The XDS.b Async profile uses the same transactions specified in the XDS.b profile without changing the message format. Async XDS changes the WSDL definition of the messages decoupling the request from the response, allowing the two to be executed asynchronously. Existing actors While the actors defined in XDS.b still maintain the same role, the technical details of how transactions are implemented will differ. New actors No new actors are necessary. Existing transactions Existing transactions in XDS.b will not be touched. XDS.b can be coupled with Async XDS, that is the same actor can expose both sync and async versions of the same transaction at the same time (on different ports/endpoints).

6 XDS.b Actors and Transactions Patient Identity Source Document Registry Document Consumer Document Repository Document Source Patient Identity Feed [ITI-8] Patient Identity Feed HL7v3 [ITI-44] Registry Stored Query [ITI-18] Register Document Set-b [ITI-42] Retrieve Document Set [ITI-43] Provide and Register Document Set-b [ITI-41] Integrated Document Source/Repository

7 Provide and Register Document Set-b Sync Document Repository Document Source Provide and Register Document Set-b [ITI-41]

8 Document Source Provide and Register Document Set-b ASync Document Repository Provide and Register Document Set-b Request Provide and Register Document Set-b Response

9 Async XDS.b Actors and Transactions Patient Identity Source Document Registry Document Consumer Document Repository Document Source Patient Identity Feed [ITI-8] Patient Identity Feed HL7v3 [ITI-44] Registry Stored Query Register Document Set-b Retrieve Document Set Provide and Register Document Set-b Integrated Document Source/Repository Registry Stored Query Response [ITI-18 Response] Register Document Set-b Response [ITI-42 Response] Provide and Register Document Set-b Response Request [ITI-41 Response]Retrieve Document Set Response [ITI-43 Response] New WSDL Request [ITI-18 Request] Request [ITI-42 Request] Request [ITI-43 Request] Request [ITI-41 Request]

10 Transactions by Actors Document Source – Provide and Register Document Set-b Response [ITI-41- Response] Document Repository – Provide and Register Document Set-b Request [ITI-41-Request] – Register Document Set-b Response [ITI-42-Response] – Retrieve Document Set Request [ITI-43-Request] Document Registry – Register Document Set-b Request [ITI-42-Request] – Registry Stored Query Request [ITI-18-Request] Document Source – Registry Stored Query Response [ITI-18-Response] – Retrieve Document Set Response [ITI-43-Response]

11 Sample WSDL Update Document Repository Sync Document Repository Async (Updated) Document Source Async (New)

12 How SOAP Headers Change Document Source Sync - ProvideAndRegisterDocumentSet-b Request urn:ihe:iti:2007:ProvideAndRegisterDocumentSet-b urn:uuid:67cd539a-87ca e c82368a Document Source Async - ProvideAndRegisterDocumentSet-b Request (Updated) urn:ihe:iti:2007:ProvideAndRegisterDocumentSet-b urn:uuid:67cd539a-87ca e c82368a

13 How SOAP Headers Change (2) Document Repository - ProvideAndRegisterDocumentSet-b Response (New) urn:ihe:iti:2007:ProvideAndRegisterDocumentSet-b urn:uuid:aaaabbbb-cccc-dddd-eeee-wwwwwwwwwww urn:uuid:67cd539a-87ca e c82368a

14 Enabled/Enhanced Scenarios

15 Store & Forward, Offline Document Repository Document Source Provide and Register Document Set-b Request Provide and Register Document Set-b Response Request Queue Response Queue

16 Reliable Messaging Document Repository Document Source Provide and Register Document Set-b Request Provide and Register Document Set-b Response

17 XCA Actors and Transactions Document Consumer Registry Stored Query [ITI-18] Retrieve Document Set [ITI-43] Initiating Gateway Responding Gateway Initiating CommunityResponding Community Cross Gateway Query [ITI-38] Cross Gateway Retrieve [ITI-39] Retrieve Document Set Request Retrieve Document Set Response

18 Discussion


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