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BPEL for Web Services

Explore BPEL, a second-generation language, and its practical applications in combining atomic web services into composite services. Learn about BPEL development process, 9-step execution, and deployment strategies.

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BPEL for Web Services

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  1. Business Process Execution Language for web services • Introduction • BPEL in Theory • BPEL in Practice BPEL for Web Services Warwick Bailey www.icodeon.com

  2. Business Process Execution Language for web services • Introduction • BPEL in Theory • BPEL in Practice BPEL for Web Services Warwick Bailey www.icodeon.com

  3. www.icodeon.com BPEL for Web ServicesCombining Atomic Web Services into a Composite Web Service BPEL is a second generation language, building on prior work by Microsoft, IBM. Standardisation now managed by Oasis. www.icodeon.com

  4. www.icodeon.com JISC e-Learning FrameworkFunctionality Factored into Atomic Web Services www.icodeon.com

  5. www.icodeon.com BPEL for JISC Web ServicesCombining Web Services from the JISC e-Learning Framework into a Composite Web Service Three services from the JISC e-Learning framework can be combined to create a formative assessment application. www.icodeon.com

  6. www.icodeon.com BPEL for JISC Web ServicesThe Composite Service is Exposed through WSDL WSDL WSDL WSDL WSDL Each atomic web service is exposed through WSDL. The composite service is exposed through WSDL. This hierarchy leads to a recursive aggregation architecture. www.icodeon.com

  7. www.icodeon.com Composite Service - Formative Assessment ApplicationQuestions and Content Shown to the Student according to Sequencing Rules www.icodeon.com

  8. www.icodeon.com Formative Assessment ApplicationJISC Funded “ASSIS” Project University of Hull University of Strathclyde (QTI Service) Icodeon Ltd, Cambridge (Sequencing Service) Stanford University Using BPEL to build a formative assessment application from individual, atomic, services in the JISC e-Learning Framework. www.icodeon.com

  9. Business Process Execution Language for web services • Introduction • BPEL in Theory • BPEL in Practice BPEL for Web Services Warwick Bailey www.icodeon.com

  10. www.icodeon.com BPEL In TheoryDevelopment Process from Design to Deployment 9 Steps …. www.icodeon.com

  11. www.icodeon.com BPEL Step 1Identify the partners in the process 4 partners are defined – the process itself, and the three atomic web service www.icodeon.com

  12. www.icodeon.com BPEL Step 2Declare the Partners in the Process <partnerLink name="questionPartnerLinkType"> <partnerRole endpointReference="static"> <wsa:EndpointReferencexmlns:assis=http://www.icodeon.com/services/assis/> <wsa:Address>http://www.scormtech.com/isis/services/QTIRun</wsa:Address> <wsa:ServiceName PortName="SOAPPort">assis:QTIRun</wsa:ServiceName> </wsa:EndpointReference> </partnerRole> </partnerLink> XML declaration for one of the partners. In this case, the QTI Run partner is named as “questionPartnerLinkType” www.icodeon.com

  13. www.icodeon.com BPEL Step 3Design the workflow of the process www.icodeon.com

  14. www.icodeon.com BPEL Step 4Define up the workflow process • Select content package (Content Packaging Service) • Find first item to sequence (Sequencing Service) • Get the resource type for the item • If the resource type is QTI xml (Content Packaging Service) • Get the QTI xml (Content Packaging Service) • Render the QTI xml as XHTML fragment (QTI Service) • Return XHTML to browser www.icodeon.com

  15. www.icodeon.com BPEL Step 5Declare the Process Using BPEL Activity Constructs <process> <partners/> <receive/> <invoke/> <invoke/> <invoke/> <reply/> </process> www.icodeon.com

  16. www.icodeon.com BPEL Step 6Add Business Logic Using BPELConstructs <sequence/> <flow/> <link/> <switch/> <throw/> <scope/> <while/> <pick/> <copy/> <assign/> www.icodeon.com

  17. www.icodeon.com BPEL Step 7Use XPath if Required <case condition="bpws:getVariableData('_sequencingRequest', ‘token/navigationToken')='start'"> www.icodeon.com

  18. www.icodeon.com BPEL Step 8Validate Process <invoke inputVariable="_runID" name="SSRun_GetTitle" operation="getTitle" outputVariable="_title" partnerLink="sequencingPartnerLinkType" portType="ns1:sequencingServicePort"/> <invoke inputVariable="_runID" name="SSRun_GetPreorderIndex" operation="getPreorderIndex" outputVariable="_index" partnerLink="sequencingPartnerLinkType" portType="ns1:sequencingServicePort"/> <invoke inputVariable="_packageID_itemID" name="CPRun_getResourceType" operation="getResourceType" outputVariable="_resourceType" partnerLink="packagePartnerLinkType" portType="ns1:packageServicePort"/> <switch> <case condition="bpws:getVariableData('_resourceType', 'stringType')='webcontent'"> www.icodeon.com

  19. www.icodeon.com BPEL Step 9Deployment www.icodeon.com

  20. Business Process Execution Language for web services • Introduction • BPEL in Theory • BPEL in Practice BPEL for Web Services Warwick Bailey www.icodeon.com

  21. www.icodeon.com BPEL Visual EditorsIBM Eclipse Plug In www.icodeon.com

  22. www.icodeon.com BPEL Visual EditorsActive Endpoints Inc. www.icodeon.com

  23. www.icodeon.com BPEL Visual EditorsActive Endpoints Inc. www.icodeon.com

  24. www.icodeon.com Deploy BPEL XML www.icodeon.com

  25. www.icodeon.com Composite Service - Formative Assessment ApplicationDriven by BPEL Workflow www.icodeon.com

  26. www.icodeon.com ASSIS ProjectNext Step www.icodeon.com

  27. Business Process Execution Language for web services • Introduction • BPEL in Theory • BPEL in Practice BPEL for Web Services Warwick Bailey / Robert Sherratt / Steve Jeyes / Niall Barr warwick@icodeon.com

  28. Formative Assessment :Questions and Content Mixed IMS Simple Sequencing “activities” arranged into an “activity tree” www.icodeon.com

  29. Formative Assessment :Sequencing Rules are Added IMS Simple Sequencing“Sequencing behaviours” are added to “activities” arranged into an “activity tree” www.icodeon.com

  30. www.icodeon.com Formative Assessment : Questions, Content and Sequencing Rules Deployed to a Web Service Infrastructure Content Management Service QTI Question Service BPEL Web Service Orchestration Engine Sequencing Service Formative Assessment Application Icodeon Sequencing Engine www.icodeon.com

  31. www.icodeon.com Formative Assessment ApplicationQuestions and Content Shown to the Student according to Sequencing Rules www.icodeon.com

  32. Formative Assessment ApplicationStudents Guided through tutorial on Protein Structures according to Sequencing Rules QTI question item Sequencing navigation controls

  33. Formative Assessment ApplicationBuilding Games Based Templates from Sequencing Rules Sequencing between “floors, corridors and rooms” scenario

  34. www.icodeon.com Formative AssessmentSequencing Rules used to drive SCORM 2004 basedSimulations www.icodeon.com

  35. www.icodeon.com Formative Assessment Sequencing Rules used to drive Problems in Mathematics 4 5 3 2 1 True False Pass Investigate www.icodeon.com

  36. Web BasedE-Learning Case Studies • Online Laboratories • Summative Assessment • Formative Assessment, Sequencing and Simulations Warwick Bailey www.icodeon.com

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