Querying the History of Software Projects using QwalKeko

Querying the History of
Software Projects using
QwalKeko
Reinout Stevens
resteven@vub.ac.be
@ReinoutStevens
Coen De Roover
cderoove@vub.ac.be
@oniroi
1

Motivation
•Commit Changes
•Undo Changes
•Retrieve Changes
•Branch & Merge
2
2

Motivation’
~6600 commits
~1000 source files
3
3

Concrete Example
01 public class Example {
02 WebDriver driver;
03
04 @BeforeTest
05 public void startDriver(){
06 driver = new FirefoxDriver();
07 }
08
09 @AfterTest
10 public void stopDriver(){
11 driver.quit();
12 }
13
14 @Test
15 public void testTitle(){
16 driver.get("http://www.google.com");
17 WebElement element = driver.findElement(By.name("q"));
18 element.sendKeys("Cheese!");
19 element.submit();
20 assertEquals(driver.getTitle(), "Cheese!");
21 }
22 }
Prevalence and Maintenance of Automated Functional Tests for Web Applications
Laurent Christophe, Reinout Stevens, Coen De Roover and Wolfgang De Meuter
Proceedings of the 30th International Conference on Software Maintenance and Evolution (ICSMe14), Victoria (Canada)
4
4

End Result
●
●
●
0.4
0.3
0.2
0.1
0.0
assertion command constant demarcator location
Change Classification
Change Hit Ratio
5
5

Queried Projects
Project ~#Commits ~#Source Files
Atlas 2200 700
EEG 800 870
Motech 1900 1090
OpenLMIS 4000 1000
xwiki 1600 200
richfaces-qa 1500 1000
6
6

Necessary Steps
1) Identify modified Selenium files
2) Compute changes made to the file
3) Classify changes made to the file
7
7

QwalKeko
https://github.com/ReinoutStevens/damp.qwalkeko
transformed
Version 1 Version 2
Version
3a
Version
4a
Version
3b
Version
4b
Version
5
Specify Source Code Conditions
using Declarative Programming
Move through Graph
Reason over Changes
8
8

Architecture
QwalKeko
9
in-source-code
(ast ?type ?node)
(has ?prop ?node ?result)
(child ?prop ?node ?child)
…
in-git-info
(fileinfo ?file version)
(author version)
(revision-number
version)
(date version)
…
Converted Graph
Changes
(change ?change left right)
(change|affects-node c ?node)
…
Qwal
q=>
q=>*
q<=
…
consults
navigates
consults
uses ChangeNodes
9

Identifying Selenium Files
1 (qwalkeko* [?file ?cu]
2 (qwal graph start start
3 (in-source-code [current]
4 (file|added ?file current)
5 (file|compilationunit ?file ?cu current)
6 (compilationunit|selenium ?cu))))
{:status :add, :file ".../ExperimentPage.java"}
#<CompilationUnit package
uk.ac.ebi.atlas.acceptance.selenium.pages;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
...
>
11
start
11

Identifying all Selenium Files
1 (qwalkeko* [?file ?cu ?end]
2 (qwal graph start ?end
3 q=>*
4 (in-source-code [current]
5 (file|added ?file current)
6 (file|compilationunit ?file ?cu current)
7 (compilationunit|selenium ?cu))))
{:status :add, :file ".../ExperimentPage.java"}
#<CompilationUnit package
uk.ac.ebi.atlas.acceptance.selenium.pages;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
...
>
#<Metaversion-867a3be00501e415bc081f25032b273f44713672>
12
start
...
?end
12

Classify Change
1 (qwalkeko* [?change ?info ?end ?type]
2 (qwal graph start ?end [?left-cu ?right-cu]
3 (in-source-code [curr]
4 (file|selenium|edit ?info curr))
5 (file|compilationunit ?info ?right-cu curr))
6 q<= ;;move backwards
7 (in-source-code [curr]
8 (compilationunit|corresponding ?right-cu ?left-cu))
9 (change ?change ?left-cu ?right-cu)
0 (classify-change ?change ?type))))
13
?end
start
13

AST Changes
Beat Fluri and Harald C. Gall. Classifying Change Types for Qualifying Change Couplings.
In Proceedings of the 14th International Conference on Program Comprehension, 2006.
A
B C
D E
α’
C
E D
F
B
A
D
F
Delete
Update
Move
Insert
14
14

Classify Location
01 ;;driver.findElement(By.name("q"));
02 (defn methodinvocation|by [?x]
03 (fresh [?name]
04 (ast :MethodInvocation ?x)
05 (child :expression ?x ?name)
06 (name|simple-string ?name "By")))
07
08
09 (defn change|affects-findBy [change ?find-by]
10 (all
11 (change|affects-node change ?find-by)
12 (methodinvocation|by ?find-by)))
15
15

Features
Git Meta Data Data & Control Flow
Information*
AST Information Changes
Declarative Query Language Graph Query Language
Performance Reasoning over Multiple
Changes
16

https://github.com/ReinoutStevens/damp.qwalkeko
https://github.com/ReinoutStevens/ChangeNodes
https://github.com/cderoove/damp.ekeko
resteven@vub.ac.be
@ReinoutStevens
Coen De Roover Laurent Christophe
Prevalence and Maintenance of Automated Functional Tests for Web Applications
Laurent Christophe, Reinout Stevens, Coen De Roover and Wolfgang De Meuter
17

Querying the History of Software Projects using QwalKeko

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