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An Approach to Measure Java Code Quality in Reuse Environment

An Approach to Measure Java Code Quality in Reuse Environment. Aline Timóteo Advisor: Silvio Meira UFPE – Federal University of Pernambuco alt.timoteo@gmail.com. Summary. Motivation Background Metrics An Approach to Measure Java Code Quality Main Contributions Status. Motivation.

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An Approach to Measure Java Code Quality in Reuse Environment

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  1. An Approach to Measure Java Code Quality in Reuse Environment Aline Timóteo Advisor: Silvio Meira UFPE – Federal University of Pernambuco alt.timoteo@gmail.com

  2. Summary • Motivation • Background • Metrics • An Approach to Measure Java Code Quality • Main Contributions • Status

  3. Motivation

  4. Motivation • Reuse Benefit • Productivity • Cost • Quality • Reuse is a competitive advantage!!!!! • Reuse environment [Frakes, 1994] • Process • Metrics • Tools • Repository • Search engine • Domain tools • …

  5. Problem • Component Repository promote reuse success [Griss, 1994] • Artifacts quality must be assured by the organization that maintains a repository? [Seacord, 1999] How to minimize low-quality artifacts reuse?

  6. Background

  7. Metrics • “Software metrics is a method to quantify attributes in software processes, products and projects” [Daskalantonakis, 1992] • Metrics Timeline • Age 1: before 1991, where the main focus was on metrics based on the code complexity • Age 2: after 1992, where the main focus was on metrics based on the concepts of Object Oriented (OO) systems

  8. Age 2: Object Oriented Age 1: Complexity

  9. Most Referenced Metrics • LOC • Cyclomatic Complexity [McCabe, 1976] • Chidamber and Kemerer Metrics [Chidamber, 1994] • Lorenz and Kidd Metrics [Lorenz, 1994] • MOOD Metrics [Brito, 1994]

  10. Problems related to Metrics [Ince, 1988 and Briand, 2002] • Metrics Validation • Theoretical Validation • Measurement goal • Experimental hypothesis • Environment or context • Empirical validation • Metrics Automation • Different set of metrics implemented • Bad documentation • Quality attributes x Metrics

  11. An Approach to Measure Java Code Quality

  12. An Approach to Measure Java Code Quality • Quality Attributes x Metrics • Metrics Selection and Specification • Quality Attributes measurement

  13. Quality in a Reuse Environment [Etzkorn, 2001] • ISO 9126

  14. Quality Attributes x Metrics

  15. Metrics Selection • Applicable for Java • Empirical Validation • Theoretical Validation • Acceptance

  16. Metrics Selection • McCabe Metric [McCabe, 1976] • Theoretical Validation, according to graphos teory • Independence of technology • Empirical Validation • Acceptance [Refactorit, 2001; Metrics, 2005; JHawk, 2007]

  17. Metrics Selection • CK Metrics [Chidamber, 1994], • Theoretical Validation, • Developed in a OO context • Empirical Validation [Briand, 1994; Chidamber, 1998; Tang, 1999]. • Acceptance [Refactorit, 2001; Metrics, 2005; JHawk, 2007]

  18. Metrics Specification

  19. Quality Attributes Measurement (QAM) • QAM = (the number of metrics that have a allowable value) • Heuristically • QAM >= Number of metrics /2 • Example: • 2,5 <= QAM <= 5 Max Testability = 5 Min Testability = 2,5

  20. Approach Automation

  21. Approach Automation Analyzability QAM = 3.0 -------> RFC: 2.0 -------> WMC 1.0 -------> CC 0.0 Changeability QAM = 3.0 -------> CBO 3.0 -------> RFC: 2.0 -------> WMC 1.0 public class Client implements Runnable, CommandListener { /** * Start the client thread */ public void start() { Thread t = new Thread(this); t.start(); } }

  22. Experiment

  23. Experiment • Main Question • The retrieval component quality is better? • Compare B.A.R.T. search results • Results before introduce filter • Results after introduce filter • Apply questionnaire for customers

  24. Main Contributions • Introduce quality analysis in a repository • Reduce code problem propagation • Highest Reliability

  25. Current Stage

  26. Referências • [Frakes, 1994] W. B. Frakes and S. Isoda, "Success Factors of Systematic Software Reuse," IEEE Software, vol. 11, pp. 14--19, 1994. • [Griss, 1994] M. L. Griss, "Software Reuse Experience at Hewlett-Packard," presented at 16th International Conference on Software Engineering (ICSE), Sorrento, Italy, 1994. • [Garcia, 2006] V. C. Garcia, D. Lucrédio, F. A. Durão, E. C. R. Santos, E. S. Almeida, R. P. M. Fortes, and S. R. L. Meira, "From Specification to Experimentation: A Software Component Search Engine Architecture," presented at The 9th International Symposium on Component-Based Software Engineering (CBSE 2006), Mälardalen University, Västerås, Sweden, 2006. • [Etzkorn, 2001] Letha H. Etzkorn, William E. Hughes Jr., Carl G. Davis: Automated reusability quality analysis of OO legacy software. Information & Software Technology 43(5): 295-308 (2001) • [Daskalantonakis, 1992] M. K. Daskalantonakis, “A Pratical View of Software Measurement and Implementation Experiences Within Motorola”, IEEE Transactions on Software Engineering, vol 18, 1992, pp. 998–1010. • [McCabe, 1976] T. J. McCabe, “A Complexity Measure”. IEEE Transactions of Software Engineering, vol SE-2, 1976, pp. 308-320. • [Chidamber, 1994] S. R. Chidamber, C. F. Kemerer, “A Metrics Suite for Object Oriented Design”, IEEE Transactions on Software Engineering, vol 20, Piscataway - USA, 1994, pp. 476-493. • [Lorenz, 1994] M. Lorenz, J. Kidd, “Object-Oriented Software Metrics: A Practical Guide”, Englewood Cliffs, New Jersey - USA, 1994. • [Brito, 1994] A. F. Brito, R. Carapuça, "Object-Oriented Software Engineering: Measuring and controlling the development process", 4th Interntional Conference on Software Quality, USA, 1994. • [Ince, 1988] D. C. Ince, M. J. Sheppard, "System design metrics: a review and perspective", Second IEE/BCS Conference, Liverpool - UK, 1988, pp. 23-27. • [Briand, 2002] L. C. Briand, S. Morasca, V. R. Basili, “An Operational Process for Goal-Driven Definition of Measures”, Software Engineering - IEEE Transactions, vol 28, 2002, pp. 1106-1125. • [Morasca, 1989] S. Morasca, L. C. Briand, V. R. Basili, E. J. Weyuker, M. V. Zelkowitz, B. Kitchenham, S. Lawrence Pfleeger, N. Fenton, "Towards a framework for software measurementvalidation", Software Engineering, IEEE Transactions, vol 23, 1995, pp. 187-189. • [Seacord, 1999] Robert C. Seacord. Software engineering component repositories. Technical report, Software Engineering Institute (SEI), 1999

  27. [Refactorit, 2001] Refactorit tool, online, last update: 01/2008, available: http://www.aqris.com/display/ap/RefactorIt • [Jdepend, 2005] JDepend tool, online, last update: 03/2006,available: http://www.clarkware.com/software/JDepend.html • [Metrics, 2005] Metrics Eclipse Plugin, online, last update: 07/2005, available: http://sourceforge.net/projects/metrics • [Jhawk, 2007] JHawk Eclipse Plugin, online, last update: 03/2007, available: http://www.virtualmachinery.com/jhawkprod.htm

  28. Aline Timóteo UFPE – Federal University of Pernambuco alt.timoteo@gmail.com

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