Aspect-oriented programming (AOP) aims to increase modularity by separating cross-cutting concerns. AspectJ is an extension to Java that implements AOP. It allows defining aspects that specify join points (e.g. method calls) in the application execution flow and advice (e.g. before, after) to add cross-cutting functionality like logging. AspectJ can weave aspects into bytecode at compile-time, post-compile, or load-time using a Java agent.

1. AspectJ
in Test Automation
by Maksym Barvinskyi

2. About me
Maksym Barvinskyi
Lead Software Engineer in Test
EPAM, Kyiv
in Test Automation since 2010

3. Typical TAF layers
Tests
Steps
Services
Logging

4. Typical TAF layers
Tests
Steps
Services
Logging
Cross-cutting concern
(наскрізна функціональність)

5. Aspect-Oriented Programming (AOP)
is a programming paradigm
that aims to increase modularity
by allowing the separation of cross-cutting concerns.
https://en.wikipedia.org/wiki/Aspect-oriented_programming

6. AspectJ
is a seamless aspect-oriented extension to the Javatm
programming language
https://www.eclipse.org/aspectj/

7. object
construction
method callmethod call
exception
throw
Join points
Application execution
Pointcut
Advice

8. object
construction
method callmethod call
exception
throw
Join points
Application execution
Pointcut
Advice
Aspect

9. Aspect example
@Aspect
public class ExampleAspect {
@Before("execution(public * com.example..*.*(..))")
public void before(JoinPoint joinPoint) {
MethodSignature signature =
(MethodSignature) joinPoint.getSignature();
System.out.println(signature.getName());
}
}

10. Pointcut examples
execution(void Point.setX(int))
call(void Point.setX(int))
withincode(void Point.setX(int))
handler(ArrayOutOfBoundsException)
within(MyClass)

11. Advise declarations
@Before
@AfterReturning
@After
@AfterThrowing
@Around

12. Java program execution flow
Java code
*.java
Bytecode
*.class
Java compiler
(javac)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time

13. Compile-time weaving
Java code
*.java
Bytecode
*.class
Java compiler
(javac)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time

14. Compile-time weaving
Java code
*.java
Bytecode
*.class
AspectJ
compiler
(ajc)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time

15. Post-compile weaving
Java code
*.java
Bytecode
*.class
Java compiler
(javac)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time

16. Post-compile weaving
Java code
*.java
Bytecode
*.class
Java compiler
(javac)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time
AspectJ
compiler
(ajc)
libs
*.jar
Bytecode
*.class

17. Load-time weaving
Java code
*.java
Bytecode
*.class
Java compiler
(javac)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time

18. Load-time weaving
Java code
*.java
Bytecode
*.class
Java compiler
(javac)
Class Loader
Bytecode verifier
Java Virtual
Machine
Just in Time (JIT)
compiler
Operating system
Hardware
Compile time Execution time
Java agent
aspectjweaver.jar

19. <argLine>
-javaagent:"${settings.localRepository}/org/aspectj/
aspectjweaver/${aspectj.version}/
aspectjweaver-${aspectj.version}.jar"
</argLine>
Looks familiar?

20. Will AspectJ and Lombok
work together?

21. Demo time

22. http://github.com/barvin/aspectj-for-tests

23. DANGER

24. AspectJ Cookbook
Aspect Oriented Solutions to
Real-World Problems
Russell Miles
Publisher: O'Reilly Media
Release Date: May 2012
Pages: 360

25. Thank you!
maksym@mbarvinskyi.com
@maksbarv