An Approach to Measure Java Code Quality in Reuse Environment Author: Aline Timteo Professor: Silvio...

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

Author: Aline TimóteoAuthor: Aline TimóteoProfessor: Silvio MeiraProfessor: Silvio Meira

UFPE – Federal University of PernambucoUFPE – Federal University of [email protected]@gmail.com


SummarySummary Motivation Background

Metrics An Approach to Measure Java Code Quality Main Contributions


MotivationMotivation


MotivationMotivation Reuse environment [Frakes, 1994]

Process Components Certification Metrics Tools

Repository Search engine Domain tools …


MotivationMotivation Component Repository promote reuse success

[Griss, 1994]

Some Repository Requirements Search Component publishing Component manage IDE Integration Component Indexing Security …


ProblemProblem 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

In other words…

How to minimize reuse to low-quality artifacts ?


BackgroundBackground


MetricsMetrics “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


Age 1: Complexity Age 2: Object Oriented

Most Referenced MetricsMost Referenced Metrics LOC

Cyclomatic Complexity [McCabe, 1976]

Chidamber and Kemerer Metrics [Chidamber, 1994]

Lorenz and Kidd Metrics [Lorenz, 1994]

MOOD Metrics [Brito, 1994]


Problems related to Metrics Problems related to Metrics [Ince, 1988 and Briand, 2002][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



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 Attributes x Metrics

Metrics Selection and Specification

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

Analysability complexty 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

complexidade x x x X x

documentation x

Reusabilitymodularity/

encapsulation x

coupling X x

cohesion x

Quality Attributes x MetricsQuality Attributes x Metrics


Quality Attributes Code Attributes Lorenz and Kidd

PIM NIM NIV NCM NCV NMO NMI NMA SIX APPM

Analysability

size x x x x x complexty

documentation

Changeability

complexity modularity/

encapsulation coupling cohesion

inheritance x x x x Stability

Testability

complexity coupling

Reusability

complexidade documentation

modularity/ encapsulation

coupling cohesion

Quality Attributes x MetricsQuality Attributes x Metrics


Quality Attributes Code Attributes MOOD Metrics

MHF AHF MIF AIF PF

Analysability

size complexty

documentation

Changeability

complexity


coupling cohesion

inheritance x x Stability

Testability

complexity coupling

Reusability

complexity documentation


coupling cohesion


Metrics Selection and SpecificationMetrics Selection and Specification- Theoretical Validation- Empirical Validation

- Tools

-LOC-Cyclomatic Complexity

- CK Metrics

Metrics Selection and SpecificationMetrics Selection and Specification


Quality Attributes Measurement (QAM)Quality Attributes Measurement (QAM) QAM = (the number of metrics that have a allowable

value)

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 = 5Min Testability = 2,5

Metrics, Quality, Reuse? Store assets

Generate their quality attributes Store asset and quality attributes

In “search time”… Asset are recovered according search parameters Quality attributes can be among these parameters


Main ContributionsMain Contributions Introduce quality analysis in a repository

Reduce code problem propagation Highest Reliability

Quality attributes x Code metrics ISO 9126


Current StageCurrent Stage Sate-of-the-art in Software Metrics

Approach definition

Prototypal Implementation (partial)

Integration with B.A.R.T. (next step)

Experiment (next step)


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


Aline TimóteoAline TimóteoUFPE – Federal University of PernambucoUFPE – Federal University of Pernambuco

[email protected]@gmail.com

An Approach to Measure Java Code Quality in Reuse Environment Author: Aline Timteo Professor: Silvio...

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