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Architectural Investigation of XCTL by URCA

This paper explores the use of Formal Concept Analysis (URCA) for the architectural investigation of XCTL, a laboratory equipment control application. The paper discusses the reverse engineering process, results comparison, and provides conclusions.

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Architectural Investigation of XCTL by URCA

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  1. Architectural Investigationof XCTL by URCA Miloš Cvetanović, Dragan BojićFaculty of Electrical Engineering University of Belgrade {cmilos, bojic}@etf.bg.ac.yu

  2. Agenda • Introduction to URCA • Formal Concept Analysis • XCTL project • Reverse engineering process • Results comparison & Conclusion cmilos@etf.bg.ac.yu

  3. Introduction • Use case Design Recoveryby means of Formal Concept Analysis (URCA) • Recovers all mandatory elementsof the Rational Unified Process model template • Static analysis → basic model elementsDynamic analysis → behavioral aspectsConcept analysis → relationships and roles Static Analysis UMLModel TestCases DynamicAnalysis ConceptAnalysis cmilos@etf.bg.ac.yu

  4. Concept Formal Concept Analysis Concept Analysis is used to identify groupings of objects that posses common attributes – Burmeister (1998). Context relation Partial orderviasuper & subconcept ordering Concept lattice cmilos@etf.bg.ac.yu

  5. Interpretation • Object maps to Function in code (O → F)(both class member and global) • Attribute maps to Use case (A → U) • Context relation – “implements” There exist at least one test case that executes F and exercise U • Concept contains: - Set of use cases – cardinality 1 in ideal case - Set of related functions cmilos@etf.bg.ac.yu

  6. XCTL Project • An application for controllinglaboratory equipment at Max Planck Institute • A reference software reengineering projectat the Humboldt University • XCTL – classical Windows application - 46 classes - 496 member functions and global functions - 38,5 KLOC cmilos@etf.bg.ac.yu

  7. Reverse Engineering Process (1) • STEP 1Identify “architecturally relevant” use cases • STEP 2 Define test cases that exercise each use case - Start & Exit - Diffraction/Reflection Area Scan - Motor control - Diffraction/Reflection Line scan - Detector use - Representation of measured data - Flow control - Automatic adjustment - Topography - Manual adjustment - General Attitude - Half-width measure cmilos@etf.bg.ac.yu

  8. Reverse Engineering Process (2) • STEP 3 Collecting dynamic informationby executing application for each use case - Profiling data (function execution count) - Function Activation Tree ( UML interaction diagrams) We define some operation on dynamic data - Differing execution count (for extends relations differentiation) - Function filtering (needed to decompose interactions) - Elimination of repeating calling sequences (loops elimination) cmilos@etf.bg.ac.yu

  9. Reverse Engineering Process (3) • Example of operations over activation tree cmilos@etf.bg.ac.yu

  10. Reverse Engineering Process (4) • STEP 4 Construction of Context relation • STEP 5 Construction of Concept latticeby means of Formal Concept Analysis cmilos@etf.bg.ac.yu

  11. Reverse Engineering Process (5) • Interpretation of the Concept lattice Root Diffraction/ReflectionScan Generalized(abstract) use cases Area Scan Line Scan Motor Control Concreteuse cases Device Control Included use cases (shared functionality) Leaf cmilos@etf.bg.ac.yu

  12. Reverse Engineering Process (6) • STEP 6 Construction of the initial UML model based upon the results of the Static analysis • STEP 7 Supplementing of the initial UML model based upon the results of Concept analysis cmilos@etf.bg.ac.yu

  13. Hierarchicaldecomposition Missing parts causedby filtering Results comparison cmilos@etf.bg.ac.yu

  14. one use caserealization foreach concept function isattached tolowestconcept thatcontains it these relationsare obtained bystatic analysis class role(a part of classthat participatesin realization) Result comparison cmilos@etf.bg.ac.yu

  15. Result comparison & Conclusion • Similarities • Same grouping criterion (use case realizations) • Differences • Class roles are not present in the manual analysis • Human intelligent abstraction logic • Hierarchies as a level of abstraction cmilos@etf.bg.ac.yu

  16. Architectural Investigationof XCTL by URCA Miloš Cvetanović, Dragan BojićFaculty of Electrical Engineering University of Belgrade {cmilos, bojic}@etf.bg.ac.yu

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