1. SYN: Ultra-Scale
Software Evolution Comprehension
Università
della
Svizzera
italiana
Software
Institute
Gianlorenzo Occhipinti · Csaba Nagy · Roberto Minelli · Michele Lanza

2. Program comprehension
is a challenging activity

3. Program comprehension
is a challenging activity
Lots of
time-based data

4. Program comprehension
is a challenging activity
Lots of
time-based data
Complex and
heterogeneous

5. SYN

7. How does it work?

8. GitHub

9. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor

10. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor
SYN Core
View Generator

11. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor
SYN Core
View Generator
GrapQL Server
Interactive
Web Interface

12. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor
SYN Core
View Generator
CLI
GrapQL Server
Interactive
Web Interface

13. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor
SYN Core
View Generator
CLI
GrapQL Server
Interactive
Web Interface
Tudor Gîrba, “Modeling history to understand software evolution,” Ph.D. dissertation, University of Bern, 2005

14. ProjectHistory
The history of a repository

15. ProjectHistory
FileHistory
1
*
The history of a repository
The history of a file (i.e., changes)

16. ProjectHistory
FileVersion
FileHistory 1 *
1
*
The history of a repository
The history of a file (i.e., changes) A file at a particular point in time

17. ProjectHistory ProjectVersion
FileVersion
FileHistory
1 *
1 *
1
*
1
*
The history of a repository
Represents a commit with
associated FileVersions
The history of a file (i.e., changes) A file at a particular point in time

18. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor
SYN Core
View Generator
CLI
GrapQL Server
Interactive
Web Interface

19. GitHub
SYN Analyzer
Repo Explorer
History Builder
Metrics Extractor
SYN Core
View Generator
CLI
GrapQL Server
Interactive
Web Interface

20. What Time Shape
Colors Varia

21. What Time Shape
Colors Varia

22. What Time Shape
Colors Varia

23. What Time Shape
Colors Varia

24. What Time Shape
Colors Varia

26. time
FileVersion
A file at a particular point in time

27. time
metric value
fixed
FileVersion
A file at a particular point in time

28. Addition
Modification
Deletion
Move
Rename
Base color
FileVersion
A file at a particular point in time

29. Addition
Modification
Deletion
Move
Rename
Base color
⚠ Entities occupy the same position
throughout their evolution
FileVersion
A file at a particular point in time

30. Addition
Modification
Deletion
Move
Rename
Base color
⚠ Entities occupy the same position
throughout their evolution
removed entity
FileVersion
A file at a particular point in time

31. Case Studies

32. The Evolution of JetUML
2K
795
10K
commits
FileHistories
FileVersions

33. “Initial commit” “Initial Revision” “#1 Move all fields” “#8 Moved to a dedicated package”
“#27 Renamed the packages” “#121 Fixed copyrights” “#212 Remove stg from name” “#374 Fix copyrights”
" Jan 07, 2015 " Jan 07, 2015 " Jan 07, 2015 " Jan 10, 2015
" Jul 22, 2020
" Nov 26, 2017
" Oct 16, 2015
" Jan 22, 2015
Addition
Move Modification Move

34. The Evolution of Linux
1M
110K
2M
commits
FileHistories
FileVersions

36. SYN: Ultra-Scale
Software Evolution Comprehension
Università
della
Svizzera
italiana
Software
Institute
Gianlorenzo Occhipinti · Csaba Nagy · Roberto Minelli · Michele Lanza
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