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Web Service Orchestration with BPEL

Web Service Orchestration with BPEL. Overview. Service Oriented Architecture Service Orchestration Understanding BPEL Orchestration Demo. Why Is This Talk Important?. Web Services Emerge As The Common Integration Technology

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Web Service Orchestration with BPEL

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  1. Web Service Orchestration with BPEL

  2. Overview Service Oriented Architecture Service Orchestration Understanding BPEL Orchestration Demo

  3. Why Is This Talk Important? Web Services Emerge As The Common Integration Technology Web Services Emerge As The Foundation For Next Generation Distributed Applications Service Oriented Architecture Harnesses These Trends Service Orchestration Enables Efficient Service Orientation

  4. Web Services Are Coming! • We Are At The End Of The Pioneer Phase • Internal Web Services Are Deployed! • Commercial Web Services Are Emerging • Key Standards WS-* Are Still Maturing • Toolkits are Maturing

  5. Service Oriented Architecture

  6. SOA Drivers Prepare For Change Changing Business Processes Adjust To Business Climate New Legislature Corporate Mergers Changing Business Partners New Suppliers New Customers Change Needs To Be Easy and Inexpensive

  7. Service Based Architecture Defined Autonomous Services Message Based Communication Alignment With Business Processes • Services Are THE Building Blocks For Applications • B2B (Business to Business) • A2A (Application to Application)

  8. Service Orchestration

  9. Orchestration vs. Choreography OrchestrationA Single Director In Control Choreography Defines Interaction. WS-Choreography describes Publicly Visible Message Exchange

  10. The Perfect Match: SOA + Orchestration SOA + Orchestration = Externalized Processes & Process Visibility High Degree Of Flexibility Low Cost Of Change Business Agility

  11. Product Suites are Migrating to SOA • Cumbersome monolithic suites with self-sufficient architectures are out • Replaced by decoupled application modules with web service interoperability wrappers • Lower acquisition and maintenance costs • Enables best-of-breed module assembly • Reduces vendor lock-in WS wrappers Enterprise Software Suite Module Module Module Module Module Module Shared Service Shared Service Shared Service Shared Service WS Integration Legacy Custom Directory Services

  12. Orchestration Engine Process Designer Activity Monitor Data Store • Database • MQ Security Transactions Scalability, Clustering, Fault Tolerance Web Service Service Orchestration Solution • Integration and process automation between web services only • Standardized BPEL process orchestrations • Ideal fit for organizations with SOA implementations, and multi-vendor best-of-breed BPM approach Typical Product Suite:

  13. Orchestration Components Design Time Tools Service Management (WSDL, endpoints) Define Process Flow Process State Monitoring Exception Management • Data Mapping • Debugging • Deployment • Run Time Environment • Expose Process As A Web Service • Execute Processes • (De-)Hydrate Process State

  14. Developing Orchestrations Design Tool .NET <process> <sequence> <receive … /> <invoke … /> </sequence> </process> Process Designer Services BPEL Process Java Publishes To Siebel Orchestration Engine

  15. Executing Orchestrations You’re approved! Loan Service 1 <process> <sequence> <receive … /> <invoke … /> </sequence> </process> Loan Service 2 Credit Validation Service Loan Service(Orchestration)

  16. Orchestration Environments Limited Support Orchestration Standards webMethods BizTalk 2000 / 2002 (2004) Intalio … Industry Rallies around BPEL OpenStorm Orchestration Suite Collaxa Microsoft BizTalk 2004 IBM Web Sphere Process Choreographer Many more… BPML XLang WSFL WSCI BPEL

  17. Service Orchestration With BPEL What can you do with BPEL?

  18. What Is BPEL? Business Process Execution Language, platform independent, XML-based A language to specify the behavior of business processes between Web services and as Web services Contains process flow constructs for conditional branching, parallel processes, nested sub-processes, process joins, etc. Uses WSDL to describe process interfaces so that they can be more easily integrated into other processes or applications. Provided as an open standard under royalty free terms.

  19. BPEL Goals Platform independence – XML based language (Java, .Net implementations available) Services and Messages are first order citizens Provide an asynchronous programming model Leverage runtime metadata based interface like WSDL ‘enterprise ready’ (security, transactional, reliable, scalable, etc.)

  20. BPEL In The Web Service Stack BPEL4WS Process WS- ReliableMessaging WS- Security WS-BA Quality Of Service WS-Coordination UDDI Discovery XSD, WSDL, WS-Policy Description SOAP Messaging XML HTTP, MQ, SMTP Transport

  21. BPEL Structure Overview Partner / Role Definitions ProcessState • <process> • <partners> … </partners> • <variables> … </variables> • <correlationSets> … </correlationSets> • <faultHandler> … <faultHandler> • <compensationHandler> … </compensationHandler> • <eventHandler> … </eventHandler> • (activities)* • </process> • activities = <receive>, <reply>, <invoke>, <assign>, <throw>, <terminate>, <wait>, <empty>, <sequence>, <switch>, <while>, <pick>, <flow>, <scope>, <compensation> Instance Matching Transaction management ExceptionHandling Events ProcessFlow BPEL 1.1 Syntax

  22. BPEL Activities <sequence> <flow> <pick> Serialized <send>, <receive>, <invoke>, <…> parallel <send>, <receive>, <invoke>, <…> Wait for one or more <receive> or an alarm condition

  23. BPEL Flow Control <switch> <case /> <otherwise /> </switch> While Wait

  24. BPEL Data Manipulation Scoped via <scope> Assignments between Variables using XPath 1.0 <assign> <copy> <from variable="AutoLoanRequest" part="creditRating" query="/creditRating/text()"/> <to variable="InterstateCarLoanRequest" part="credit" query="/credit/text()"/> </copy> </assign>

  25. <propertyAlias propertyName="orderNumber" messageType="POMessage" part="PO" query="/PO/Order"/> <correlationSets> <correlationSet name="PurchaseOrder" properties="orderNumber"/> </correlationSets> … <receive partnerLink="Buyer" portType="PurchasingPT" operation="AsyncPurchase" variable="PO"> <correlations> <correlation set="PurchaseOrder" initiate="yes"> </correlations> </receive> BPEL Message Correlation

  26. BPEL Transactions Support for transactional integrity <compensationHandler> <invoke partnerLink="Seller" operation="SyncPurchase" …> … <compensationHandler> <invoke partnerLink="Seller" operation="CancelPurchase“ …/> </compensationHandler> </invoke> Invoke via <compensate> <switch> <case …> <compensate/> </case> Ongoing discussions in the OASIS TC about use of WS-Coordination

  27. BPEL Error Handling <faultHandlers> <catchAll> … </catchAll> </faultHandlers> … <switch> <case condition= "bpws:getVariableProperty(stockResult,level) > 100"> <throw faultName="OutOfStock"/> </case>

  28. Demo

  29. Orchestration Products OpenStorm Service Orchestrator Microsoft: BizTalk Server 2004, Visio Collaxa IBM WebSphere Process Choreographer Oracle AS, JDeveloper webMethods Eclipse plug-in Oracle: AS and JDeveloper BEA WebLogic 8.1 …

  30. Why BPEL? Cost Pressure Through Choice Scale Up Mix-and-Match Open Standard Supported By Microsoft And IBM

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