These are the slides for the talk I gave at Codebits hackathon 2011: https://codebits.eu/intra/s/session/195 It shows how you can raise the level of abstraction and make your life a lot easier by using AOP (with AspectJ). Examples are for the Android platform, but are easily ported to other java frameworks.

1. AOP
A case-study in Android
by
Carlos Anjos
anjosc@imeshine.com

2. Why ?

3. Developing for Android
● The 5 stages of grief
● Denial
– “This can't be that bad, I must be missing something ...”
● Anger
– “WTF did they have to reinvent the wheel … for the worse ?!”
● Bargaining
– “Maybe I can find a port of my favorite framework for android … Err....
Maybe I can patch it to make it work ...”
● Depression
– “Nothing works … nothing will ever work … :'-( Maybe I should stick to
doing HTML and Javascript ...“
● Acceptance
– “Oh well … let's start coding !” - «Resistance is futile»

4. Real men don't eat honey, they chew bees !

5. What is AOP ?

6. AspectJ

7. AspectJ – Java AOP
● Cross-cutting concerns

8. AOP - Weaving
Source: AspectJ in Action

9. AOP – Like Themes

10. Concepts
•Jointpoint
•Pointcut
•Advice
•Aspect

11. How AspectJ implements AOP
Source code weaving
Binary weaving
Load Time weaving

12. How it works

13. How it works

14. How it works (with Android)

15. The case study

16. AspectJ FTW!
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17. AspectJ - Level 2

18. AspectJ – Level 3

19. AspectJ - Level 4

20. AspectJ – Level 5

21. AspectJ – Level 6

22. AspectJ – Level 7

23. AspectJ – Level 8

24. AspectJ – Level 100

25. AspectJ – Over 9000 !
Paradigm Shift !
Careful …
don't try to solve
everything with
aspects !
OOP is still good ! :-)

26. “Perfection is achieved,
not when there is nothing more to add,
but when there is nothing left to take away.”
Antoine de Saint-Exupéry

27. Resources
● AspectJ in Action, Ramnivas Laddad
● http://www.eclipse.org/aspectj/
● http://www.eclipse.org/ajdt/
● http://android.imeshine.com/
● stackoverflow.com
● commonsware.com
● apps.sapo.pt
● developer.android.com

28. Questions ?