an approach to measure java code quality in reuse environment

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An Approach to Measure Java Code An Approach to Measure Java Code Quality in Reuse EnvironmentQuality in Reuse Environment

Aline TimóteoAline TimóteoAdvisor: Silvio MeiraAdvisor: Silvio Meira

Co-advisor: Eduardo AlmeidaCo-advisor: Eduardo Almeida

UFPE – Federal University of PernambucoUFPE – Federal University of [email protected]@cin.ufpe.br

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SummarySummary

Motivation An Approach to Measure Java Code Quality Main Contributions Status

An Approach to Measure Java Code Quality

in a Reuse Environment

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MotivationMotivation

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MotivationMotivation

Reuse is a competitive advantage Quality Coust



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ProblemProblem

Component Repository promote reuse success [Griss, 1994]

Artifacts quality must be assured by the organization that maintains a repository? [Seacord, 1999] Many version of a component on the repository Lack of context

How to minimize low-quality artifacts reuse?



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An Approach to An Approach to Measure Java Code Measure Java Code

QualityQuality

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An Approach to Measure Java Code QualityAn Approach to Measure Java Code Quality

Quality

Metrics Selection

Quality Attributes measurement



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



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Quality Attributes x MetricsQuality Attributes x Metrics

Quality Attributes Code Attributes LOC Cyclomatic Complexity CK Metrics

WMC DIT NOC CBO RFC LCOM

size x

Analyzability complexity x x x X X

documentation x

complexity x x x X X

modularity/

encapsulation X

Changeability coupling x X

cohesion X

inheritance x

Stability

Testability complexity x x x X X

coupling x X

complexity x x x X x

documentation x

Reusabilitymodularity/

encapsulation x

coupling X x

cohesion x



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Metrics SelectionMetrics Selection

Applicable for Java

Empirical Validation

Theoretical Validation

Acceptance




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McCabe Metric [McCabe, 1976] Theoretical Validation, according to graphs theory

Independence of technology

Empirical Validation

Acceptance [Refactorit, 2001; Metrics, 2005; JHawk, 2007]




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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]




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Metrics SpecificationMetrics Specification




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Quality Attributes Measurement (QAM)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


Quality Attribute

Code Attribute CK Metrics

WMC DIT CBO RFC LCOMTestability

complexity x x x x

coupling x x

Max Testability = 5

Min Testability = 2,5



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AutomationAutomation




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ExperimentExperiment


Java Class

Stored Class

Generate Class´s

measurement

Java Class with metrics metadata

Recover class request

Good quality Class



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ExperimentExperiment

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




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Main ContributionsMain Contributions

Introduce quality analysis in a repository Reduce code problem propagation Highest Reliability

...



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Current StageCurrent Stage



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ReferênciasReferências [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



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[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




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Aline TimóteoAline Timóteo

UFPE – Federal University of PernambucoUFPE – Federal University of Pernambuco

[email protected]@gmail.com

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an approach to measure java code quality in reuse environment

Documents

reuse environment etzkorn

artifacts quality

lowquality artifacts

reuse success griss

number of metrics

selectionck metrics

attributes measurement

silvio meiracoadvisor