The Influence of an External Transaction on a BPEL Scope

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The Influence of an External Transaction on a BPEL Scope

  1. 1. 17th International Conference on COOPERATIVE INFORMATION SYSTEMS CoopIS 2009 – http://www.onthemove‐conferences.org/index.php/coopis The Influence of an External Transaction on a BPEL Scope Oliver Kopp, Ralph Mietzner, Frank Leymann Institute of Architecture of Application Systems (IAAS) www.iaas.uni‐stuttgart.de Presented by Oliver Kopp 1
  2. 2. Agenda Background Usual Integration of Partner Services Choreography Scenario Relationship of WS‐Coordination Activities Extension of WS‐Business Activity Presented by Oliver Kopp 2
  3. 3. Background SOA Implementation: WS‐Plattform Architecture Curbera, F., Leymann, F., Storey, T., Ferguson, D.,Weerawarana, S.:Web Services Platform  Architecture: SOAP, WSDL, WS‐Policy, WS‐Addressing, WS‐BPEL, WS‐Reliable Messaging and  More. Prentice Hall PTR, Englewood Cliffs (2005) Services (described by WSDL) Orchestrated by a business process Business Process Execution Language (BPEL) A business process is a service, too Long‐running transactions Compensation instead of ACID SAGA‐Principle: Garcia‐Molina, H. & Salem, K. Dayal, U. & Traiger, I. L.  (ed.) Sagas. SIGMOD’87, ACM Press Presented by Oliver Kopp 3
  4. 4. Usual Integration of Partner Services Visa  Agency Travel  Application BPEL’s transaction boundaries are scopes Invokation of the visa agency is also a scope What if the visa application has to be compensated? “Manual compensation” Automated coordination Tai, S., Khalaf, R., Mikalsen, T.A.: Composition of Coordinated Web Services. In: Middleware 2004. Presented by Oliver Kopp 4
  5. 5. WS‐Coordination Framework Coordinator Coordination Context BPEL  Activation Registration  Protocol  Service 1 Process Service Service Service Message including Coordination Context Message including Coordination Context Service 2 Tai, S., Khalaf, R., Mikalsen, T.A.: Composition of Coordinated Web Services. In: Middleware 2004. Presented by Oliver Kopp 5
  6. 6. WS‐Coordination Activity Tree BPEL  Coordinator Service 1 Process Service 2 BPEL  Process Service 1 Service 2 Service 2.1 Presented by Oliver Kopp 6
  7. 7. Coordination Protocol: WS‐Business Activity Service is tied to life‐cycle of calling process Compensation‐based Transactions: WS‐Business Activity (WS‐BA) coordination protocol Coordinator generated Participant generated completed close closed Active Completed Closing Ended compensate fail compensated failed cancel fail Compensating Failing fail Canceling canceled Tai, S., Khalaf, R., Mikalsen, T.A.: Composition of Coordinated Web Services. In: Middleware 2004. Presented by Oliver Kopp 7
  8. 8. Scenario Visa  Application Travel Agency 24h Send Booking Details Print and Send Ticket Inform Customer Send  Confirmation Flight  24h started Free  Create  Send  Airline Reserve Seat Seat eTicket eTicket Send  Confirmation Flight canceled Presented by Oliver Kopp 8
  9. 9. Scope Relations – WS‐Coordination “Tree” Travel Agency Visa  Application Scope Scope Booking (SB) Ticket (ST) Airline Scope Send  Reservation (SR) eTicket Travel Agency  Airline Process Process Scope SB Visa Application Scope ST Scope SR Send eTicket Nesting relationship of WS‐Coordination Activities Pottinger, S., Mietzner, R., Leymann, F.: Coordinate BPEL Scopes and Processes by Extending the WS‐Business Activity Framework. In: 15th International Conference Presented by Oliver Kopp on Cooperative Information Systems (CoopIS 2007). 9
  10. 10. Need for Participant‐Triggered Compensating Current WS‐BA: Coordinator triggers compensation WS‐BA w/ PTC: Coordinator and Participant may trigger  compensation compensate Preparing closing Closing Closing prepared Prepared prepare closing close compensating close closed Completed Closing Closed Ended compensate compensating compensated failed fail Compensating Failing Coordinator generated Presented by Oliver Kopp Participant generated 10
  11. 11. Conclusion and Outlook A BPEL scope may be a participant in two compensation‐based transactions Solved by a modification of WS‐BA Transaction boundary = scope boundary Last activity of scope: “reply” to incoming message What if last activity of scope is not a “reply”? What if scope boundary is not external transaction  boundary? What if scope is child of multiple external partners? Presented by Oliver Kopp 11

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