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Web Services Identification in Legacy Code
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Web Services Identification in Legacy Code

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  • 1. Mining candidate web services from legacy code Lerina Aversano – RCOST Univ. Of Sannio, Italy Massimiliano Di Penta – RCOST Univ. Of Sannio, Italy Ciro Palumbo – Engineering Ingegneria Informatica S.p.A., Italy
  • 2. Motivations and objective
    • Service-oriented systems are becoming a reality
    • System integrators tend to build systems by composing services
    • However, lack of services available
    • But…
    • Features are just there, implemented in existing legacy systems
    • Objective of this work:
      • Search for potential services inside existing legacy systems
      • Integrated approach:
        • Combines IR tracing with structural matching of the goal WSDL onto existing methods
  • 3. Related Work
    • Stroulia, 2004:
      • Uses Java2WSDL of AXIS to extract WSDL from legacy systems
        • Flexible Interface Matching for Web-Service discovery
    • Kokash, 2006;
      • Structural comparison of existing services
        • A comparison of Web Service Interfaces Similarity Measures
  • 4. Proposed Architecture
  • 5. Matching Source-Target
    • Based on Kokash’s algorithm
    • Combined matching Textual+Structural
    • Query expansion based on WordNet
    • Lucen: a text search engine library
    • XML schema of method parameter types are reversed from the source code
      • Java library types handled through a library
  • 6. CLAROS – Structural Matching
    • Objective: searching for a send mail service
    • Precision and recall vary for different threshold values
      • Threshold is the maximum value for a range of scores
  • 7. CLAROS – Hybrid matching
    • Textual + Structural
    • Improves the recall
    • Missing services due to lack of relationship concept-term
  • 8. Work in progress
    • Dealing with relationships terms concepts
      • Use of ontologies
      • Latent Semantic Indexing
    • Use of execution traces
    • Slicing of legacy code to extract the feature to be exported as a service
  • 9. Questions?