Source Code Metrics Framework Nikolay Grozev Neli Maneva Delyan - - PowerPoint PPT Presentation

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Source Code Metrics Framework Nikolay Grozev Neli Maneva Delyan - - PowerPoint PPT Presentation

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International Conference on Computer Science and Education in Computer Science CSECS11 Facilitating Quality Assurance through a Source Code Metrics Framework Nikolay Grozev Neli Maneva Delyan Lilov Overview Introduction Preceding

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Facilitating Quality Assurance through a Source Code Metrics Framework

International Conference on Computer Science and Education in Computer Science CSECS’11 Nikolay Grozev Neli Maneva Delyan Lilov

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria 2

Overview

  • Introduction
  • Preceding work
  • Extended framework
  • Prototype and validation
  • Conclusion and future work
  • Authors and Acknowledgements
  • Questions
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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

INTRODUCTION

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Introduction

  • Optimizing QA activities is a top priority, especially in times of

economical hardship

  • Static source code metrics present a promising approach to

partially automating QA work

  • We extend our previous research in the area by employing:

– A CCC (Constant/Continuous/Correct) approach – An approach that can facilitate the so-called "umbrella" activities

  • As a result our previous framework is technically and

conceptually extended to better incorporate in practitioners’ daily life.

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

PRECEDING WORK

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Core source code framework

Design and structure

  • An abstract framework allowing practitioners to consider the context of the

code measurements.

  • Comprises a number of separate modules modeled as functions

– Metric functions – extract the metrics values based on some code artifacts; – Preprocessor functions – prepare the artifacts used by the metric functions; – Evaluation functions – combine metric values into meaningful code quality evaluations.

  • A user can “hook” contextual logic through custom preprocessor and

evaluation functions.

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source code evaluation

. . .

preprocessor function preprocessor function preprocessor function metric function metric function evaluation function evaluation function e v a l u a t i

  • n

f u n c t i

  • n

metric function

source code evaluation source code evaluation source code module

(class, method, package etc.)

metric function parameters

(filtered graphs, hierarchies etc.)

metric function parameters

(filtered graphs, hierarchies etc.)

. . .

metrics values

(cyclomatic complexity, LOC, Halstead volume etc.)

metric function parameters

(filtered graphs, hierarchies etc.)

artifacts

(control flow graphs, inheritance hierarchy etc.)

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

EXTENDED FRAMEWORK

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Extended Framework

Overview

  • The extended framework adds

conceptual and technical extensions to the core one

  • Its main focus is usability
  • The extensions are “inspired” by

practical experience gained while trying to incorporate a prototype of the core framework

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source code evaluation . . . preprocessor function preprocessor function preprocessor function metric function metric function evaluation function evaluation function evaluation function metric function source code evaluation source code evaluation source code module (class, method, package etc.) metric function parameters (filtered graphs, hierarchies etc.) metric function parameters (filtered graphs, hierarchies etc.) . . . metrics values (cyclomatic complexity, LOC, Halstead volume etc.) metric function parameters (filtered graphs, hierarchies etc.) artifacts (control flow graphs, inheritance hierarchy etc.)

Core framework

web interface statistical charts visualization

  • f historical

data explanations

  • f metrics values

interpretations explanations

  • f the code

evaluations IDE integration treemap visualization integration with versioning systems automatic extraction of context information user specified context information views to the framework

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Extended Framework

Extensions

  • Interface of the framework

– Should be accessible to both engineering and managerial staff – Web interface – integrated with popular web based project management

and tracking systems used by managerial staff

– IDE integration - for engineers

  • Metrics values visualizations

– Visualization techniques to spot code modules with poor quality -

statistical charts, treemaps, polymetric views etc.

– Visualization of historical trends of metrics values and assessments for

continuous code quality monitoring.

– Version control systems can be source of historical information.

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Extended Framework

Extensions

  • Explanation system

– Engineers find it difficult to interpret metrics values. They should be

provided with interactive info on metrics values and interpretations.

– Aggregated evaluations should also be explained so to evaluate for

"false positives". This can be achieved by an expert system.

  • Framework settings

– Core framework represents solely a source code evaluation scheme – Defining the correct functions may be a time consuming task requiring

significant expert knowledge

– A set of both preprocessor and evaluation functions can be predefined

for often recurring contexts. A user has to specify the context of the application.

– Automatic context detection based on project structure - binaries, import

statements, naming conventions etc.

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Extended Framework

Extensions

  • Views to the framework

– The framework should facilitate the different roles in the software

lifecycle by providing different user account capabilities - views.

– A view defines how a user accesses the system and his/her accessible

functionalities.

– Predefined views:

  • View for source code developers - IDE access only. Suitable for interactive

feedback when programming and testing.

  • View for senior software engineering staff - access to all features. The only

view with access to the framework settings.

  • View for managerial staff - web interface only. Historical information/trends,

high-level visualizations etc.

– Custom views can be defined as well.

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

PROTOTYPE AND VALIDATION

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Prototype and validation

  • Current prototype status:

– Prototype of the core framework. – Eclipse IDE integration. – Metrics visualizations - statistical charts, treemap visualization etc. – Context settings are done manually. – No explanation engine, historical information and support for views yet.

  • Early adopters' feedback:

– The close integration of the visualizations within the IDE allowed for interactive

and understandable code quality feedback.

– Visualizations saved a lot of time when conducting code reviews. – Lack of explanations of the code evaluations. – Absence of easy ways to tune contextually the framework. – Managerial staff could not test due to lack of appropriate interface.

  • The Identified problems can be overcome by implementing the rest
  • f the framework.

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

CONCLUSION AND FUTURE WORK

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Conclusion and future work

  • A framework supporting quality assurance was presented.
  • The framework extends our previous rather abstract one with a set
  • f concrete conceptual and technical features.
  • These features/extensions are meant to increase its usability in the

context of daily software development and management.

  • The results from the experiments with a preliminary prototype were

described.

  • Ideas for further research:

– To implement in a prototype all of the proposed in this study core

framework extensions and to examine them;

– To study more source code metrics so as to decide which of them can

be added to the base set of metrics.

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Authors and Acknowledgements

  • Nikolay Grozev, nikolay.grozev@gmail.com
  • Assoc.Prof. PhD Neli Maneva, Software Engineering

Department, Institute of Mathematics and Informatics - BAS neli.maneva@gmail.com

  • Delyan Lilov, Musala Soft Ltd, delyan.lilov@musala.com

This work has been partially supported by the Bulgarian National Science Research Fund (project ДМУ02/18 / 18.12.2009).

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Computer Science and Education in Computer Science – CSECS’11, July 7-11 2011, Sofia, Bulgaria

Questions

Thank you!

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