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An Eclipse-Based Web Service Composition Tool

An Eclipse-Based Web Service Composition Tool. A Presentation for Faculty and Students at Computer Science Dept. California State University, Los Angeles Candidate: Martin J. Olsen Advisor: Dr. Jiang Guo As part of Master Thesis Requirements. (CS 599B) Date: 03/19/2007. Agenda.

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An Eclipse-Based Web Service Composition Tool

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  1. An Eclipse-Based Web Service Composition Tool A Presentation for Faculty and Students at Computer Science Dept. California State University, Los Angeles Candidate: Martin J. Olsen Advisor: Dr. Jiang Guo As part of Master Thesis Requirements. (CS 599B) Date: 03/19/2007

  2. Agenda • Introduction • Demo • System architecture • Design and implementation • Future work • Conclusion • References • Q & A!

  3. Introduction • Abstract: “A graphical plug-in for Eclipse, where the user can create and execute Web Service Compositions.” (Picture 1) • Technologies: Java, Apache Axis, WSDL4J, JWSDL, Eclipse, Eclipse GEF, WSIF, BPEL4WS, BPWS4J. • Web Service Composition: • “Define business processes that interact with external entities through Web Service operations defined using WSDL 1.1, and that manifest themselves as Web services defined using WSDL 1.1.” [1] • “The problem of composing autonomous services to achieve new functionality.” [2]

  4. Demo • Creating a new composition • Different elements of the graphical plug-in • The Palette • The Stage • Properties view • Model Elements • Executing the Composition • A perfect composition • Error handling! Click for video demo!

  5. System Architecture – Eclipse SDK • Eclipse SDK consists of a kernel and standard plug-ins. “Everything in Eclipse is a plug-in.” • Third party plug-ins can be loaded into Eclipse also. • Plug-ins can be extended • Implement plug-in interfaces • Plug-in Manifest file • Plug-in extends: • Eclipse Workspace • Eclipse Workbench • Eclipse GEF (3rd party)

  6. System Architecture – Web Services • Client Framework – Apache Axis • Soap engine/implementation • XML-based communication and encoding format • Server Framework • Apache Tomcat • Apache Axis

  7. System Architecture – Plug-in Overview

  8. System Architecture - Traversal • Traversal Algorithm • Find root. • Output of element -> Input of next element • Invoke • Successful -> (Goto 2) Failure -> End

  9. System Architecture – Eclipse GEF • Eclipse GEF - a typical MVC framework. (Struts, Spring)

  10. Design and implementation – The model

  11. Design and implementation – Retrieving the Model

  12. Design and implementation – Invoking the Model

  13. Future Work – Data Mapper

  14. Future Work – Invoke Element

  15. Future Work - UDDI

  16. Conclusion • Creating a plug-in is a meticulous process. Requires understanding of: • Eclipse SDK • Eclipse GEF • Web Services, AXIS • Other Frameworks, WSIF, WSDL4J • Puzzling it all together has required every part of previous knowledge, motivation and creativity. • Successful implementation.

  17. References [1] BPEL, Wikipedia http://en.wikipedia.org/wiki/BPEL [2] SWORD, A developer toolkit for Web Service Composition http://www2002.org/CDROM/alternate/786/

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