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 Pernambucoalt@cin.ufpe.bralt@cin.ufpe.br

SummarySummary

Motivation An Approach to Measure Java Code Quality Main Contributions Status

An Approach to Measure Java Code Quality

in a Reuse Environment

MotivationMotivation

Reuse is a competitive advantage Quality Coust

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?

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

QualityQuality

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

Quality

Metrics Selection

Quality Attributes measurement

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

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

Metrics SelectionMetrics Selection

Applicable for Java

Empirical Validation

Theoretical Validation

Acceptance

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

Independence of technology

Empirical Validation

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

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]

Metrics SpecificationMetrics Specification

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

AutomationAutomation

ExperimentExperiment

Java Class

Stored Class

Generate Class´s

measurement

Java Class with metrics metadata

Recover class request

Good quality Class

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

Main ContributionsMain Contributions

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

Current StageCurrent Stage

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

[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

Aline TimóteoAline Timóteo

UFPE – Federal University of PernambucoUFPE – Federal University of Pernambuco

alt.timoteo@gmail.comalt.timoteo@gmail.com

An Approach to Measure Java Code Quality in Reuse Environment

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Transcript of An Approach to Measure Java Code Quality in Reuse Environment

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