Android Aspect Oriented Programming

This is an introduction to aspect oriented programming in Android. It also introduces Frodo Android Library based on AOP for logging RxJava Observables and Subscribers.

Transcript

1. Aspect Oriented
   Programming
   Frodo Android Library
   +
   @fernando_cejas
   http://www.fernandocejas.com
   

   View Slide

2. Aspect Oriented Programming
   title, date, 01 of 10
   In computing, aspect-oriented programming
   (AOP) is a patented programming paradigm
   that aims to increase modularity by allowing the
   separation of cross-cutting concerns.
   https://github.com/android10/frodo
   

   View Slide

3. AOP Terminology
   title, date, 01 of 10
   ● Cross-cutting concerns: Cohesive areas of functionality
   across an application.
   ● Advice: The code that is injected to a class file.
   ● Joint point: A particular point in a program that might be the
   target of code injection.
   ● Pointcut: An expression which tells a code injection tool
   where to inject a particular piece of code.
   ● Aspect: The combination of the pointcut and the advice is
   termed an aspect.
   ● Weaving: The process of injecting code – advices – into the
   target places – joint points.
   

   View Slide

4. AOP Terminology
   title, date, 01 of 10
   

   View Slide

5. Where can we apply AOP?
   title, date, 01 of 10
   ● Logging
   ● Persistence
   ● Performance monitoring
   ● Data Validation
   ● Caching
   ● Etc...
   https://github.com/android10/frodo
   

   View Slide

6. Where does the magic happen?
   title, date, 01 of 10
   ● Run-time
   ● Load-time
   ● Build-time
   https://github.com/android10/frodo
   

   View Slide

7. Tools and Libraries
   title, date, 01 of 10
   ● AspectJ: A seamless aspect-oriented extension to the
   Javatm programming language (works with Android).
   ● Javassist for Android: An android porting of the very well
   known java library Javassist for bytecode manipulation.
   ● DexMaker: A Java-language API for doing compile time or
   runtime code generation targeting the Dalvik VM.
   ● ASMDEX: A bytecode manipulation library as ASM but it
   handles the DEX bytecode used by Android executables.
   

   View Slide

8. Why AspectJ?
   title, date, 01 of 10
   ● Very powerful.
   ● Supports build time and
   load time code injection.
   ● Easy to use.
   https://github.com/android10/frodo
   

   View Slide

9. title, date, 01 of 10
   Frodo
   

   View Slide

10. Frodo
    title, date, 01 of 10
    It is an aspect oriented library for logging/tracing
    based on Annotations:
    ● @RxLogObservable
    ● @RxLogSubscriber
    https://github.com/android10/frodo
    

    View Slide

11. Frodo
    title, date, 01 of 10
    https://github.com/android10/frodo
    

    View Slide

12. Frodo
    title, date, 01 of 10
    

    View Slide

13. Frodo
    title, date, 01 of 10
    ● Annotations Module
    ● Library Runtime
    ● Gradle Plugin
    

    View Slide

14. How to use Frodo?
    title, date, 01 of 10
    https://github.com/android10/frodo
    

    View Slide

15. How to use Frodo?
    title, date, 01 of 10
    

    View Slide

16. Frodo
    title, date, 01 of 10
    ● Generated code?
    ● Performance?
    

    View Slide

17. Thanks!
    title, date, 01 of 10
    http://www.fernandocejas.com/
    

    View Slide