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Software Evolution Visualization
Lucian Voinea
www.win.tue.nl/~lvoinea/VCN.html
Eindhoven, 03.02.2006
Why Software Evolution Visualization ?
Software understanding
- what is the structure of the project ?
- what is important ?
- what is difficult ?
- who work on it ?
- what parts are connected to a given part ?
- what parts refer to a given aspect ?
Product and process assessment
- what is the process ?
- what is the core team ?
- where is the activity concentrated ?
- what is stable ?
www.win.tue.nl/~lvoinea/VCN.html
Eindhoven, 03.02.2006
Challenges
Data acquisition
- data source  SW Configuration Management
- long acquisition times
- large storage space, large bandwidth
- data parsing & maintenance
SW Configuration Management
≠
SW evolution mining
Data analysis
- Enrich recorded evolution data
E.g. evolution similarity metrics
Data visualization
- multivariate : 10s attributes (Demo 6 attributes)
- large data amount : 100s files,10s versions, 1000s lines
VTK
ArgoUML
– 2700 files x 100 versions
– 4452 files x 80 versions
www.win.tue.nl/~lvoinea/VCN.html
Eindhoven, 03.02.2006
SW Evolution Visualization Toolset
version control
management
system
data extraction
CVSgrab
CVS
Project evolution
visualization
www.win.tue.nl/~lvoinea/VCN.html
CVSscan
File evolution
visualization
Eindhoven, 03.02.2006
CVSgrab
Metric
views
System evolution at time ti
Time
F1
V1
V2
V3
Vertical layout –
given by a sort
criteria
F2
Evolution
of file Fi
F3
F4
E.g. Creation time,
Folder, Activity,
Similarity
Files
Color - encodes a file metric computed on a given version
E.g. File type, Version author, Size increase, Release ID,
Specific text, Activity
www.win.tue.nl/~lvoinea/VCN.html
Eindhoven, 03.02.2006
CVSgrab Example
Color encodes version author
Different
Similar
Horizontal
metric :
Release ID
Time
Vertical metric : similarity
www.win.tue.nl/~lvoinea/VCN.html
Files
Eindhoven, 03.02.2006
CVSscan
v1 v2 v3 v4 v5
Time
if self.bShowClusterColor:
glBlendFunc(GL_ONE_MINUS_...
glEnable(GL_BLEND)
yPos = 0
bSwitch = True
for i in lCushionMap:
if bSwitch:
cushions.drawColorCl..
else:
cushions.drawColorClus…
bSwitch = not bSwitch
yPos = yPos + i
glDisable(GL_BLEND)
#cushion clusters
glBlendFunc(GL_ZERO,GL_...
glEnable(GL_BLEND)
yPos = 0
bSwitch = True
Color - encodes a
line metric
www.win.tue.nl/~lvoinea/VCN.html
Eindhoven, 03.02.2006
CVSscan
Line layout
Normal Layout
Horizontal Layout
Discrete time (versions)
Discrete time (versions)
Deleted
lines
Lines to be
inserted
Legend
www.win.tue.nl/~lvoinea/VCN.html
Constant line
New lines
Eindhoven, 03.02.2006
CVSscan Example
Color encodes content
www.win.tue.nl/~lvoinea/VCN.html
Color encodes authors
Eindhoven, 03.02.2006
Conclusions
• Toolset for visualization of software evolution : CVSgrab & CVSscan
• Exploit source code history from CVS as main source for getting
insight in the structure and development process
• Complements existing reverse engineering and code navigation tools
• Outlook: Improve the data analysis step, find mechanisms for
annotation management, improve selection mechanisms, enhance the
visualization with new features, extend the data acquisition sources and
types…
www.win.tue.nl/~lvoinea/VCN.html
www.win.tue.nl/~lvoinea/VCN.html
Eindhoven, 03.02.2006