On Experimenting refactoring tools to remove code smellsXp 2015 workshop

Introduction

Refactor = reusability, maintainability and readability

PG reluctant to refactor Does Tools helps?

Experiment

Masters students to Refactor Project in qualitascorpus http://qualitascorpus.com/

4 refactoring tools

Refactoring Tools

Eclipse IntelliJ IDEA

Commercial IDE Jdeodorant

Eclipse plugin only tools for smell detection and give suggestion step

for refactor RefactorIT

Commercial Eclipse plugin Analysis and refactor helper

Code Smell detect tools

iPlasma: free, detect 11 types of smells Jdeodorant: detect 4 types of smells InCode: comercial 10 code smell for C/C++/Java

Décor, CheckStyle, CodeProAnalytics, JBuilder

Code Smells

God Class, Brain Method, Brain Class, Data Clumps, Feature envy(class內聚性低 ), Intensive coupling, Long method, shotgun surgery, type checking

Which tool is more useful?

Eclipse

Can refactor most of smells Very user-friendly Can highly customized (high control on refactoring) Provide preview

IntelliJ IDEA

Many refactor options Less customizable than eclipse(less control on how

to refactoring) Sometimes crashes

RefactorIT

Similar to eclipse Less option than eclipse

JDeodorant

Auto detect & auto refactor But sometimes cause more bug Some crashes occur If auto refactor PG may unfamiliar with new code.

Which smell easier to remove by tool?

Easeist

Feature Envy Method should be moved to where Supported by Jdeodorant

Intensive Coupling Also can be fixed by move

type checking Polymorphism or State/Strategy pattern Support by eclipse/ Jdeodorant

hardest

God Class Brain Class

which tool is more useful for each smells?

Brain/God class/method

Eclipse the best intelliJ

Less refactor option Jdeodorant

have some problem but provide useful guide

Data clumps

Eclipse/intelliJ extract class (group data together)

Feature Envy

Jdeoderant auto detect and refactor

other tools can also do refactor

Intensive coupling

RefactorIT, Eclipse, IntelliJ

Long method

Extract method refactoring Eclipse, IntelliJ, RefactorIT(no preview) Jdeodorant may have some error

Shotgun surgery

Eclipse > intelliJ for execution time, usability, preview

Type Checking

Best is eclipse (usually have no problem) Jdeoderant (less intuitive)

Summary Eclipse the best IntelliJ

Many refactor option and analysis But sometimes crash

Jdeodorant Auto detect and auto refactor But both have some problem

RefactorIT Used like eclipse but less option