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AOP
A case-study in Android
by
Carlos Anjos
anjosc@imeshine.com
Why ?
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»
Real men don't eat honey, they chew bees !
What is AOP ?
AspectJ
AspectJ – Java AOP
● Cross-cutting concerns
AOP - Weaving
Source: AspectJ in Action
AOP – Like Themes
Concepts
•Jointpoint
•Pointcut
•Advice
•Aspect
How AspectJ implements AOP
Source code weavingBinary weaving
Load Time weaving
How it works
How it works
How it works (with Android)
The case study
AspectJ FTW!
}
AspectJ - Level 2
AspectJ – Level 3
AspectJ - Level 4
AspectJ – Level 5
AspectJ – Level 6
AspectJ – Level 7
AspectJ – Level 8
AspectJ – Level 100
AspectJ – Over 9000 !
Paradigm Shift !
Careful …
don't try to solve everything with aspects !
OOP is still good ! :-)
“Perfection is achieved, not when there is nothing more to add,
but when there is nothing left to take away.”
Antoine de Saint-Exupéry
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
Questions ?
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