Proactive Clone Recommendation System for Extract Method Refactoring

Jun 6, 2019Download as PPTX, PDF0 likes130 views

“Extract Method” refactoring is commonly used for merging code clones into a single new method. In this position paper, we propose a proactive clone recommendation system for “Extract Method” refactoring. The proposed system that has been implemented as Eclipse plug-in monitors code modifications on the fly. Once the proposed system detects an “Extract Method” refactoring instance based on the analysis of code modifications, it recommends code clones of the refactored code as refactoring candidates. The preliminary user study shows that the users are able to refactor a greater number of clones in less time compared to a code clone analysis environment GemX.

Proactive Clone Recommendation System
for Extract Method Refactoring
Eunjong
Choi
Norihiro
Yoshida
Katsuro
Inoue
Seiya
Numata
1

Code clone (duplicated code)
Developers tend to write clones unintentionally
even in the case that it is easily avoidable.
File A File B
Code Clone
copy and paste
copy and paste
2

Clone Refactoring
It performs “Extract Method”
and then merges clones into a single method.
Before After
callRefactoring
3

Developers are motivated to refactor clones!
[Alomar et al., IWoR 2019]
4

Related Works:
Tool Support for Clone Refactoring
? Tairas and Gray [IST ‘12]
? extension of refactoring engines to handle variation of clones
? Meng et al. [ICSE ‘15]
? clone refactoring tool based on systematic edit
? Mazinanian et al. [ICSE ‘16]
? a part of the refactoring tool JDeodorant
? refactorability analysis [TSE ‘15]
5

Strike while the iron is hot!
? Only hot clones are refactored in industry
? In industry, cost of clone refactoring cannot be ignored.
? Regression test after refactoring takes much cost.
? Industrial developers do not touch source code
after a large-scale system test for releasing a major version.
Active support of clone refactoring is needed.
6

Proposed Plug-in
It detects ‘Extract Method’ on the fly
and then recommend the corresponding clones.
7
Monitors code modification on the fly
and detects ‘Extract Method’
Recommends developers to merge
the other corresponding clones at same time
Phase1: Monitor & Detection Phase2: Clone Recommendation
Extract
Methodclone
clone new m.
clone
Online
analysis
clone
clone new m.
clone
recommends

Architecture of the proposed plug-in
8
developer
Editor
AST-level diff
Clone
detection
(CCFinderX)
Keystroke
monitoring
Diff
analysis
Clone
recommendation
Refactoring
detection
Clones of
refactored code
Clone
detection
result
Refactoring
detection
result

Keystroke and diff analyses
1. Identifies the insertion/deletion of one or greater lines.
2. Keeps AST-based diff once the insertion/deletion is identified
Insertion of
a method
declaration
Deletion of
a code block
…
9

Detection of “Extract Method” Refactoring
??????, ?????????????????
∧
Delete, ????__?????
∧
??????, ????????????????
?????
???????? ????__????? = ???????? ????????????????
∧ ???? ????????????????? = ????(????????????????)
Insertion of method
declaration
Block deletion
Insertion of method
invocation
Block and the method invocation are at the same position.
Declared and invoked methods are the same names.
10

Clone detection & recommendation
? Clone Detection
? Performs clone detection when a method
declaration is inserted in Eclipse AST
? Uses CCFinderX
High-speed token-based clone detection tool
? Clone Recommendation
? Recommend code clones of the code fragment
which is extracted by ”Extract Method” refactoring
recommends
clone
clone new m.
clone
clone
clone
clone
11

12
Start the monitoring of clone refactoring by
selecting “monitoring refactoring” menu
Java editor of Eclipse
List of recommend clones
A pair of
code clones

13
Extract Method
Detects clones of the code which is
extracted by “Extract Method”

14
A list of modified files A list of code clones in
the modified file
A list of code clones
in the other file
A list of all files
Clone set ID Clone set info. Line numbers

Summary & Future work
? We proposed a proactive clone recommendation system
for extract method refactoring.
? monitors code modification on the fly and detects ‘Extract Method’
? recommends developers to merge the corresponding clone to the
new method
? We plan to apply other “Extract Method” detection technique
and then perform a large-scale user study.
16

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Proactive Clone Recommendation System for Extract Method Refactoring

1. Proactive Clone Recommendation System for Extract Method Refactoring Eunjong Choi Norihiro Yoshida Katsuro Inoue Seiya Numata 1

2. Code clone (duplicated code) Developers tend to write clones unintentionally even in the case that it is easily avoidable. File A File B Code Clone copy and paste copy and paste 2

3. Clone Refactoring It performs “Extract Method” and then merges clones into a single method. Before After callRefactoring 3

4. Developers are motivated to refactor clones! [Alomar et al., IWoR 2019] 4

5. Related Works: Tool Support for Clone Refactoring ? Tairas and Gray [IST ‘12] ? extension of refactoring engines to handle variation of clones ? Meng et al. [ICSE ‘15] ? clone refactoring tool based on systematic edit ? Mazinanian et al. [ICSE ‘16] ? a part of the refactoring tool JDeodorant ? refactorability analysis [TSE ‘15] 5

6. Strike while the iron is hot! ? Only hot clones are refactored in industry ? In industry, cost of clone refactoring cannot be ignored. ? Regression test after refactoring takes much cost. ? Industrial developers do not touch source code after a large-scale system test for releasing a major version. Active support of clone refactoring is needed. 6

7. Proposed Plug-in It detects ‘Extract Method’ on the fly and then recommend the corresponding clones. 7 Monitors code modification on the fly and detects ‘Extract Method’ Recommends developers to merge the other corresponding clones at same time Phase1: Monitor & Detection Phase2: Clone Recommendation Extract Methodclone clone new m. clone Online analysis clone clone new m. clone recommends

8. Architecture of the proposed plug-in 8 developer Editor AST-level diff Clone detection (CCFinderX) Keystroke monitoring Diff analysis Clone recommendation Refactoring detection Clones of refactored code Clone detection result Refactoring detection result

9. Keystroke and diff analyses 1. Identifies the insertion/deletion of one or greater lines. 2. Keeps AST-based diff once the insertion/deletion is identified Insertion of a method declaration Deletion of a code block … 9

10. Detection of “Extract Method” Refactoring ??????, ????????????????? ∧ Delete, ????__????? ∧ ??????, ???????????????? ????? ???????? ????__????? = ???????? ???????????????? ∧ ???? ????????????????? = ????(????????????????) Insertion of method declaration Block deletion Insertion of method invocation Block and the method invocation are at the same position. Declared and invoked methods are the same names. 10

11. Clone detection & recommendation ? Clone Detection ? Performs clone detection when a method declaration is inserted in Eclipse AST ? Uses CCFinderX High-speed token-based clone detection tool ? Clone Recommendation ? Recommend code clones of the code fragment which is extracted by ”Extract Method” refactoring recommends clone clone new m. clone clone clone clone 11

12. 12 Start the monitoring of clone refactoring by selecting “monitoring refactoring” menu Java editor of Eclipse List of recommend clones A pair of code clones

13. 13 Extract Method Detects clones of the code which is extracted by “Extract Method”

14. 14 A list of modified files A list of code clones in the modified file A list of code clones in the other file A list of all files Clone set ID Clone set info. Line numbers

15. 15 Highlighted code clone

16. Summary & Future work ? We proposed a proactive clone recommendation system for extract method refactoring. ? monitors code modification on the fly and detects ‘Extract Method’ ? recommends developers to merge the corresponding clone to the new method ? We plan to apply other “Extract Method” detection technique and then perform a large-scale user study. 16

Editor's Notes

#8: そこで，その问题点を解决するために，贰肠濒颈辫蝉别プラグインにより以下の环境を提案します．提案环境は大きく分けて2つの机能を有しており，1つ目の机能では，贰肠濒颈辫蝉别を利用している开発者の作业内容をモニタリングし，その中からメソッド抽出リファクタリングの集约パターンを见つけます．そして，2つ目の机能では，そのメソッド抽出リファクタリングが行われたコード片のコードクローンを検出し，同时に集约するように推荐します．これにより，开発者は滨顿贰と切り离した作业が必要なく，开発の际中に同时集约候补を知ることができ，见落としなく，少ないコストでメソッド抽出リファクタリングを行えると考えます．(3:00)
#9: ここからそれぞれのステップについて説明します．まずはステップ１のキー入力追跡です．(5:04)
#11: Here is the formula of the conditions of Extract method refactoring used in this study. There are five conditions in this formula, The first one is the insertion of method declaration. The second one is block deletion. The third one is the insertion of method invocation, The forth one is the block and the method invocation are at same position. The declared and invoked method are same name. When the all of 5 conditions are satisfied, the proposed plugin regards the code modification as ”Extract Method” refactoring.
#13: Here is the screenshot of the proposed plugin. An user starts the monitoring of clone refactoring by selecting “by the monitoring refactoring menu. The view on the right-hand side shows the list of recommend clones based on the analysis of code modification in the Java editor of Eclipse. The Java editor on the left-hand side includes a pair clones.
#14: Here we assume a user performs “Extract Method” refactoring as you can see in the left-hand side on the slide. Then, the proposed plug-in detects clones of the code fragment is extracted by “Extract Method”refactoring as you can see on the right-hand side of the slide.
#15: At the same time, the list of recommend clones is shown in the right-hand side of the result view. Once a user selects one of them …
#16: The recommend clone is highlighted in the Java Editor of Eclipse.

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Proactive Clone Recommendation System for Extract Method Refactoring

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Editor's Notes