Introduction to AspectJ

Erol KOCAMAN

GDG Istanbul

25/10/2014

Peak Games

Peak Games

Agenda

● Why we use AOP ?● Cross Cutting Concerns● Aspect Implementations in Java● AOP with OOP● AspectJ Compiler● Demo Project

Why do we use AOP ?

GAME 1

Module 1

Module 2

Module 3

GAME 2

Module 4

Android

IOS

Desktop

Cross Cutting Concerns

In App Billing Networking Game

Logging Analytics Profiling

After Aspect

In App Billing Networking Game

Logging

Aspect

Analytics

Aspect

Profiling

Aspect

AOP / OOP

● OOP is encapsulation of module for better understanding

● You can even do the same thing with OOP by coding more

● AOP is valid for all programming paradigms

Aspect Implementations

● AspectJ● Spring AOP● JBossAOP● JAC● Colt● PROSE

Java & Aspect

Source Files

AspectJ Compiler

Java & Aspect

Archive Files

(.jar)

Java & Aspect

Archive Files

(.jar)

Java & Aspect

Archive Files

(.jar)

AspectJ

Compiler

(ajc)

Woven system

(.class files)

Java & Aspect

Source FilesJava & Aspect

Source Files

(.java)

Program Execution

Terminology

Join Points

Pointcut

// aspect codeif (...) {

...} else {

...}

Advice

JoinPoint Types

● Method● call● execution

execution(* android.mobile.peakgames.net.aspectjandroid.AspectActivity.fetchImage(..))

● Constructorexecution(* android.mobile.peakgames.net.aspectjandroid.AspectActivity.new(..))

● Field Access ● Exception Handler Execution● Class Initialization

Call / Execution Aspect Difference

ATM Account

debit(...)

Call Execution

Aspect

Aspect

AspectJ Annotations

@Aspect@Pointcut@Before@After@AfterReturning@AfterThrowing@Around

https://github.com/firstthumb/AspectJ-Android-Example

Code with sample

We are Hiring!www.peakgames.net

Thank You!