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Messaging & Web Services an Architectural View

Messaging & Web Services an Architectural View. John Arnett, MSc Standards Modeller Information and Statistics Division NHSScotland Tel: 0131 551 8073 (x2073) mailto:John.Arnett@isd.csa.scot.nhs.uk http://isdscotland.org/xml. Contents. XML Usage XML Applications

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Messaging & Web Services an Architectural View

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  1. Messaging & Web Services an Architectural View John Arnett, MSc Standards Modeller Information and Statistics Division NHSScotland Tel: 0131 551 8073 (x2073) mailto:John.Arnett@isd.csa.scot.nhs.uk http://isdscotland.org/xml

  2. Contents • XML Usage • XML Applications • Messaging and Web Services • Interaction Models • Message Construction

  3. XML Usage • Key features • Human readable • Structured and searchable • Separates data from presentation • Self-describing • Extensible – any number of tags allowed • Meta-markup language

  4. XML Usage • Open standard, promoted by many vendor-neutral organisations, incl. • W3C • OASIS (Organization for Structured Information Standards) • HL7 (Health Level 7) • OMG (Object Management Group) • UK Government

  5. XML Usage • Widely supported by software vendors and open source groups, incl.

  6. Application Logic Presentation Messaging & Web Services Application Logic Presentation Presentation Messaging & Web Services Presentation Application Logic Application Logic XML Applications Data Storage & Content Management

  7. Messaging and Web Services • XML Messages • Ideal for data interchange • Text based • Open • Self describing • Extensible • Exchanged between applications on the same network or over the Internet/Extranet

  8. Messaging and Web Services • Web Services • Set of emerging standards, incl. SOAP, WSDL and UDDI • Allow systems to communicate over the internet using XML messages • Used for • remote service requests/calls • enterprise application integration • business process integration

  9. Messaging and Web Services • SOAP • Lightweight, XML-based protocol for exchanging information over the internet • Language, platform and transport independent • v1.2 W3C Recommendation

  10. Messaging and Web Services • WSDL (Web Services Definition Language) • XML-based language for describing services available on the internet • UDDI (Universal Description, Discovery and Integration) directory services • Information Services • Operations

  11. Interaction Models • Message Channel Message Channel Sender Receiver

  12. Message Interaction Models • One-way (“fire-and-forget”) • non-blocking, asynchronous model Consumer Provider

  13. Request Response Interaction Models • Synchronous Request/Response • RPC Consumer Provider

  14. Request with correlation id Response Acknowledgement Acknowledgement Interaction Models • Call Back • Asynchronous conversations Consumer Provider

  15. Interaction Models Telephone-like Post Office-like Synchronous Asynchronous Tighter coupling Loose coupling Strongly typed Document-based Fast feedback Slower feedback - call-return - queuing and routing RPC Message-oriented

  16. Interaction Models • Point-to-Point • One input channel to one output channel • Message sent to 1 receiver only • Message sent directly or via router/queue

  17. Interaction Models • Multi-Point • One input channel to many output channels or subscribers • Copy of message sent to each subscriber • Message published via router / topic

  18. Message Construction • Document - transmits structured or unstructured data • Command - specifies a function or method to invoke on the receiver • Event - notifies receiver of some event of interest, e.g. an acknowledgement • Message Types

  19. Message Construction • High Level Information Model • HL7 v3 RIM • CEN (European) Standards • e-GIF (UK Government)

  20. Message Construction • Message Content • Clinical guidelines, e.g. SIGN • National Data Definitions, e.g. SMR • Consultation with user groups, professional bodies and manufacturers • Other sources, e.g. existing EDIFACT messages

  21. Message Construction • Standard XML Vocabularies • Health Care • NHSS architectural schemas • Health Level 7 (HL7) v3 • Government • UK GovTalk schemas • International • UNeDocs Code Lists XML - units of measurement, etc

  22. Message Construction • Message Schemas • Messages • Referral • Waiting Times • Message Structures • NHSS • HL7 CDA • Government Gateway

  23. SOAP Envelope SOAP Header SOAP Body Message Structure Message Content Message Construction

  24. Find Out More • Scottish Health and Community Care XML Steering Group • www.isdscotland.org/xml • SCI XML Standards • www.show.scot.nhs.uk/sci • GovTalk Schemas and Standards • www.govtalk.gov.uk • Health Level 7 • www.hl7.org

  25. Messaging and Web Sevices • W3C Web Services Activity • www.w3.org/2002/ws • Web Services Interoperability • www.ws-i.org

  26. Communication Models • WS-I Usage Scenarios • www.ws-i.org/SampleApplications/ SupplyChainManagement/2003-04/ UsageScenarios-1.01-BdAD.doc • Enterprise Integration Patterns • www.enterpriseintegrationpatterns.com

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