The document discusses a holistic approach to evolving software systems over time. It addresses how systems will scale to much larger sizes in 10-15 years, how they will be structured and evolved, and how to ensure their dependability, security, safety and reliability as they grow increasingly complex. The author advocates considering all aspects of a system's development and usage when planning how it will adapt to future changes and challenges.

1. Engineering
Dependable
Software
Systems
!
Michele Lanza
REVEAL @ Faculty of Informatics
University of Lugano, Switzerland

2. Engineering
Software
Systems
!
Michele Lanza
REVEAL @ Faculty of Informatics
University of Lugano, Switzerland

3. !
Software Engineering
is dead

13. Engineering
Software
Systems
!
Michele Lanza
REVEAL @ Faculty of Informatics
University of Lugano, Switzerland

14. Evolving
Software
Systems
!
Michele Lanza
REVEAL @ Faculty of Informatics
University of Lugano, Switzerland

15. A Holistic Approach to
Evolving
Software
Systems
!
Michele Lanza
REVEAL @ Faculty of Informatics
University of Lugano, Switzerland

16. holism
|ˈhəәʊlɪz(əә)m, ˈhɒl-|
!
The theory that parts of a whole are
in intimate interconnection, such that
they cannot exist independently of the
whole, which is thus regarded as
greater than the sum of its parts.

17. 1
2
3
4
What will be the scale of systems be 10-15 years
from now?
What will those systems look like?
How will they be structured and evolved?
How do we ensure their dependability, security,
safety, reliability?

18. What will be the scale of systems
10-15 years from now?

19. public class HelloWorld {
!
public static void main(String[] args) {
System.out.println("Hello, World");
}
}
What's in a line?

21. Class
S0
Lines of Code
Example
< 1,000 whatever
S1
< 10,000 JUnit
S2
< 100,000 Mylyn
S3
S4
< 1,000,000
ArgoUML
Vuze
< 10,000,000 Eclipse
Windows
S5
< 100,000,000
S6
< 1,000,000,000 !
Linux

22. What will systems
look like in the future?

25. How will they be
constructed and evolved?

26. How should they be
constructed and evolved?

27. Prehistory
History

28. Prehistory
History

29. Prehistory
History

32. Prehistory
History
VCS
CVS/SVN
MSR
seventies
nineties
2004

33. Mining
Software
Repositories

34. edit
run
compile

35. review
rearchitect
version
tasks
design
edit
reuse
RSS
document
run
IRC
Twitter
debug Skype
diff
Facebook
recommend
refactor
navigate
visualize
blog
compile
e-mail
test reengineer

38. !
!
for(int j=m; j>i; j--){
uCJM1= dataUC[j-1];
uCJ= dataUC[j];
if(uCJM1.compare(z)>
{ /* exchange */
tempStr= data[j-1];
/* sort the data */
data[j-1]= data[j];
data[j]= tempStr;
}
}
dataUC[j-1]= uCJ;
dataUC[j]= uCJM1;

42. !
!
!
!
!
Alice wrote:
> On Mon 23, Bob wrote:
> > Dear list,
> > When starting up ArgoUML on my MacOS X system (Java 2)
> > it throws a NullPointerException very soon. You'll find the
> > trace below. I hope someone knows a solution. Thanks a lot!
>
>
>
>
>
>
>
>
Exception in thread "main" java.lang.NullPointerException
at
javax.swing.event.SwingSupport.fireChange(SwingChange.java)
at javax.swing.AbstractAction.setEnabled(AbstractAction.java)
[...]
> > at uci.uml.Main.main(Main.java:148)
>
>
>
>
I'm sorry I can't help you Bob but thanks for sharing the stack...
Alice.
-"Beware of programmers who carry screwdrivers." --L. Brandwein
Alice, I believe the flawed Explorer.java class generates Bob's issue:
public void setEnclosingFig(Fig each) {
super.setEnclosingFig(each);
if (each != null || (each.getOwner() instanceof MPackage)) {
m = (MPackage) each.getOwner(); }
The problem is in the condition, I attach the diff with this version:
--- src/org/argouml/ui/explorer/Explorer.java
(revision 14338)
+++ src/org/argouml/ui/explorer/Explorer.java (working copy)
@@ -147,1 +147,1 @@
[...]
super.setEnclosingFig(each);
- if (each != null || (each.getOwner() instanceof MPackage)) {
+ if (each != null && (each.getOwner() instanceof MPackage)) {
m = (MPackage) each.getOwner(); }
Probably ModelTree is also affected, if so, please change it =)
Cheers, Carl.
-- I used to have a sig, but it took up much space so I got rid of it!
--------------------------------------------------------------------To unsubscribe, e-mail: dev-...@argouml.tigris.org
For additional commands, e-mail: dev-...@argouml.tigris.org

43. (1)
(2)
(3)
(4)
(5)
(6)
!
(7)
(8)
(9)
(10)
(11)
!
Alice wrote:
On Mon 23, Bob wrote:
Dear list,
When starting up ArgoUML on my MacOS X system (Java 2)
it throws a NullPointerException very soon. You'll find the
trace below. I hope someone knows a solution. Thanks a lot!
Exception in thread "main" java.lang.NullPointerException
at
javax.swing.event.SwingSupport.fireChange(SwingChange.java)
at javax.swing.AbstractAction.setEnabled(AbstractAction.java)
[...]
at uci.uml.Main.main(Main.java:148)
(12)
(13)
(14)
(15)
I'm sorry I can't help you Bob but thanks for sharing the stack...
Alice.
-"Beware of programmers who carry screwdrivers." --L. Brandwein
(16)
(17)
(18)
(19)
(20)
Alice, I believe the flawed Explorer.java class generates Bob's issue:
public void setEnclosingFig(Fig each) {
super.setEnclosingFig(each);
if (each != null || (each.getOwner() instanceof MPackage)) {
m = (MPackage) each.getOwner(); }
(21)
(22)
(23)
(24)
(25)
(26)
(27)
(28)
The problem is in the condition, I attach the diff with this version:
--- src/org/argouml/ui/explorer/Explorer.java
(revision 14338)
+++ src/org/argouml/ui/explorer/Explorer.java (working copy)
@@ -147,1 +147,1 @@
[...]
super.setEnclosingFig(each);
- if (each != null || (each.getOwner() instanceof MPackage)) {
+ if (each != null && (each.getOwner() instanceof MPackage)) {
m = (MPackage) each.getOwner(); }
(29)
(30)
(31)
(32)
(33)
(34)
Probably ModelTree is also affected, if so, please change it =)
Cheers, Carl.
-- I used to have a sig, but it took up much space so I got rid of it!
--------------------------------------------------------------------To unsubscribe, e-mail: dev-...@argouml.tigris.org
For additional commands, e-mail: dev-...@argouml.tigris.org
!
!
!
Non-relevant
Natural Language
Stack trace
Source code
Patch

44. The content of unstructured data
produced during the evolution of a
software system is a valuable information
source to support software understanding
and evolution and complements data
mined from structured sources.
!
Alberto Bacchelli
!
Mining Unstructured Software Data
!
PhD Thesis, University of Lugano, 2013

46. !
Integrated Development Environments + Recommender Systems
!
!
!
!
!
!
!
!
!
!
!
Intelligent Development Environments

47. The Librarian daemon looks like a pleasant,
fiftyish, silver-haired, bearded man with bright blue
eyes, wearing a V-neck sweater over a work shirt,
with a coarsely woven, tweedy-looking wool tie.
The tie is loosened, the sleeves pushed up.
!
Even though he's just a piece of software, he
has reason to be cheerful; he can move through the
nearly infinite stacks of information in the Library with the agility
of a spider dancing across a vast web of cross-references. The [..]
only thing he can't do is think.
!
“Yes, sir," the Librarian says. He is eager without being
obnoxiously chipper, he clasps his hands behind his back, rocks
forward slightly on the balls of his feet, raises his eyebrows
expectantly over his half-glasses.

48. A Holistic Approach to
Evolving
Software
Systems
!
Michele Lanza
REVEAL @ Faculty of Informatics
University of Lugano, Switzerland