Tudor Gîrba
www.tudorgirba.com

1946

1956

1956

1956

1956 2006

1956 2006

1956 2006

1956 2006
?

Software is complex.
29% Succeeded
18% Failed
53% Challenged
The Standish Group, 2004

How large is your project?

How large is your project?
1’000’000 lines of code

How large is your project?
1’000’000 lines of code
* 2 = 2’000’000 seconds

How large is your project?
1’000’000 lines of code
* 2 = 2’000’000 seconds
/ 3600 = 560 hours

How large is your project?
1’000’000 lines of code
* 2 = 2’000’000 seconds
/ 3600 = 560 hours
/ 8 = 70 days

How large is your project?
1’000’000 lines of code
* 2 = 2’000’000 seconds
/ 3600 = 560 hours
/ 8 = 70 days
/ 20 = 3 months

Software development
is more than forward engineering.
Fo
rw
ar
d
en
gin
ee
rin
g
{ { { {
{
{
} { {
Actual development
} } }
}
} } } }
{

Reverse engineering
is needed to make sense of the code.
Fo
rw
ing ar
r
ee d
en
gin gin
n
e ee
se rin
er g
v
Re
{ { { {
{
{
} { {
Actual development
} } }
}
} } } }
{

Reverse engineering is creating high level views.
ing
r
ee
in
ng
e
e
s
er
ev
R
{ {
{
{
}
}
}
} }
{

McCabe = 21
NOM 0
= 102
,00
3
75
=
C
LO
...
Metrics Queries Visualizations
{ {
{
{
}
}
}
} }
{

Metrics compress the system into numbers.
0
Cyclomatic complexity = 21
,00
3
75
NOM
= =
102
OC
L
{ {
{
{
}
}
}
} }
{

Queries reduce the analysis space.
{ {
{
{
}
}
}
} }
{

Visualization compresses the system into pictures.
{ {
{
{
}
}
}
} }
{

70% of our sensors are dedicated to vision.

How many groups do you see?

How many groups do you see?

How many groups do you see?

How many groups do you see?

CodeCity Wettel, Lanza, 07
shows
where
your
code
lives.

Distribution Map
shows
how
properties
spread.
Ducasse etal, 06

Polymetric views show up to 5 metrics.
Lanza etal, 03
Width metric
Height metric
Position metrics
Color
metric

System Complexity shows class hierarchies.
attributes
methods lines

Class Blueprint shows class internals.
Ducasse, Lanza, 05
Initialize Interface Internal Accessor Attribute
invocation and access direction

Class Blueprint shows class internals.

Visualization compresses the system into pictures.
{ {
{
{
}
}
}
} }
{

McCabe = 21
NOM 0
= 102
,00
3
75
=
C
LO
...
Metrics Queries Visualizations
{ {
{
{
}
}
}
} }
{

Duplication
detection
McCabe = 21
Evolution analysis
NOM 0
= 102
,00
3
Dynamic analysis
75
=
C
LO
...
Semantic analysis
Metrics Queries Visualizations
{ {
{
{
}
}
}
} }
{

Moose provides an agile visualization scripting.
Meyer etal, 2005
view := ViewRenderer new.
view borderedRectangleShape.
view nodes: classes forEach: [:each |
view nodes: each methods.
view gridLayout
].
view edgesFrom: #superclass.
view treeLayout.
view open.

CVS hides the past

But, who did this?

We color the files according to the authors.

Still, alphabetical order is no order.

Ownership Map reveals developer patterns.
Girba etal, 2005

FAMIX
Meta UI Mondrian EyeSee
Repository Core

FAMIX
Meta UI Mondrian EyeSee
Repository Core
Java
iPlasma MSE Smalltalk
C++

Chronia Cook CodeCity DynaMoose Hapax Softwarenaut SmallDude
FAMIX
Meta UI Mondrian EyeSee
Repository Core
Java
iPlasma MSE Smalltalk
C++

CVS J-Wiretap MSE Source
Chronia Cook CodeCity DynaMoose Hapax Softwarenaut SmallDude
FAMIX
Meta UI Mondrian EyeSee
Repository Core
Java
iPlasma MSE Smalltalk
C++

CVS J-Wiretap MSE Source
...
Concept
BugsLife Clustering Subversion
Analysis
Chronia Cook CodeCity DynaMoose Hapax Softwarenaut SmallDude
FAMIX
Meta UI Mondrian EyeSee
Repository Core
Java
iPlasma MSE Smalltalk
C++

Moose is a collective effort

Current Team Previous Team
Stéphane Ducasse Serge Demeyer
Tudor Gîrba Michele Lanza
Adrian Kuhn Sander Tichelaar
Current Contributors Previous Contributors
Hani Abdeen Ilham Alloui Tobias Aebi Frank Buchli
Gabriela Arevalo Mihai Balint Thomas Bühler
Calogero Butera
Philipp Bunge
Marco D’Ambros Daniel Frey
Georges Golomingi
Orla Greevy Markus Hofstetter David Gurtner Reinout Heeck
Matthias Junker Adrian Lienhard Markus Kobel Michael Locher
Martin von Löwis
Mircea Lungu Pietro Malorgio Michael Meer
Michael Meyer Damien Pollet Laura Ponisio Daniel Ratiu
Sara Sellos Lucas Streit Matthias Rieger Azadeh Razavizadeh
Toon Verwaest Roel Wuyts Andreas Schlapbach Daniel Schweizer
Richard Wettel Mauricio Seeberger Lukas Steiger
Daniele Talerico Herve Verjus
Violeta Voinescu.

Current Team Previous Team
Stéphane Ducasse Serge Demeyer
Tudor Gîrba Michele Lanza
Adrian Kuhn Sander Tichelaar
Current Contributors menPrevious Contributors
~ 100 years
Hani Abdeen Ilham Alloui Tobias Aebi Frank Buchli
Gabriela Arevalo Mihai Balint Thomas Bühler
Calogero Butera
Philipp Bunge
Marco D’Ambros Daniel Frey
Georges Golomingi
Orla Greevy Markus Hofstetter David Gurtner Reinout Heeck
Matthias Junker Adrian Lienhard Markus Kobel Michael Locher
Martin von Löwis
Mircea Lungu Pietro Malorgio Michael Meer
Michael Meyer Damien Pollet Laura Ponisio Daniel Ratiu
Sara Sellos Lucas Streit Matthias Rieger Azadeh Razavizadeh
Toon Verwaest Roel Wuyts Andreas Schlapbach Daniel Schweizer
Richard Wettel Mauricio Seeberger Lukas Steiger
Daniele Talerico Herve Verjus
Violeta Voinescu.

Tudor Gîrba
www.tudorgirba.com

Tudor Gîrba
www.tudorgirba.com
creativecommons.org/licenses/by/3.0/