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Using A Rigorous Approach for Engineering Web Service Compositions: A Case Study

Using A Rigorous Approach for Engineering Web Service Compositions: A Case Study. Paper Presentation and Discussion Heberth Braga G. Ribeiro hbgr@cin.ufpe.br. Authors. Howard Foster, Sebastian Uchitel, Jeff Magee, Jeff Kramer at the Imperial College London (UK)

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Using A Rigorous Approach for Engineering Web Service Compositions: A Case Study

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  1. Using A Rigorous Approach for Engineering Web Service Compositions: A Case Study Paper Presentation and Discussion Heberth Braga G. Ribeiro hbgr@cin.ufpe.br

  2. Authors • Howard Foster, Sebastian Uchitel, Jeff Magee, Jeff Kramer at the Imperial College London (UK) • Michael Hu at the Police Information Technology Organization (UK) http://www.rise.com.br

  3. Introduction • The case study is taken from a national development currently underway by the Police IT Organization (PITO) in the UK • The view of the project is to consolidate distributed national police services and to form a set of core processes • The contribution of the study is to support a series of different police enquiry types • Study of some scenarios described within the scope of interacting police enquiry types http://www.rise.com.br

  4. Background • A series of services requires management and coordination • Implementations needs to be constructed for a series of differing scenarios • Specification perspective – focus is on service interactions • Is important to build the web service compositions correctly, verify the process before deployment, etc... http://www.rise.com.br

  5. Background An Approach to Rigorous Web Service Composition Engineering http://www.rise.com.br

  6. Scope and Requirements • Compositions consists of an orchestration of a number of web services implemented basic enquiry • Core enquiry processes running on a central business process architecture PITO Web Services Architecture Scope http://www.rise.com.br

  7. Interaction Specifications • Interactions are added to support the steps described in the scenario • The composition service in this scenario is form from a single “police enquiry” • The policy enquiry composition makes a request using key search criteria • Basic Message Sequence Chart(bMSC) assumes that each enquiry is performed sequentially from the central service http://www.rise.com.br

  8. Interaction Specifications Concurrency Composition Improvement http://www.rise.com.br

  9. Implementations • Web Service Compositions • The process consists of a series of BPEL4WS process statements http://www.rise.com.br

  10. Implementations • Web Service Coreography • Defines a kind of policy for “rules of engagement” • The police enquiry composition interacts with other services • Adressing choreography take us back to the designer • Provides a global view of requirements for one or more scenarios http://www.rise.com.br

  11. Implementations Overview of Choreography Architecture in Elaborated Composition Scenario http://www.rise.com.br

  12. Analysis and Evaluation of Approach • Effort required to adress issues that arise when building for service-oriented distributed set of processes • Potencial to mesure the impact of service changes, and affected compositions that interact with these services http://www.rise.com.br

  13. Conclusions • It is important to compose the service workflow correctly for all the services actors • Verify the flow before actual implementation and deployment is undertaken • Verify compensation routines between processes http://www.rise.com.br

  14. The end... http://www.rise.com.br

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