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Aspect Oriented Development

Aspect Oriented Development. Alex Beatty. Introduction. Purpose Cross-cutting Concerns Join Points, Pointcuts , and Advices Weaving Invasive vs. Non-Invasive Static vs. Dynamic. Purpose. What is a cross-cutting concern? Examples Reduction of code tangling and code scattering

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Aspect Oriented Development

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  1. Aspect Oriented Development Alex Beatty

  2. Introduction • Purpose • Cross-cutting Concerns • Join Points, Pointcuts, and Advices • Weaving • Invasive vs. Non-Invasive • Static vs. Dynamic

  3. Purpose • What is a cross-cutting concern? • Examples • Reduction of code tangling and code scattering • Abstraction • Obliviousness • Expert Development • Object Reuse

  4. Join Points • Join Point - Point in the base code that aspect code can utilized • Examples • A method being called • A method’s code being run • Initialization

  5. Pointcuts • User defined join point(s) to utilize aspect code with • AspectJ examples • execution(!static * (Class1 || ClassA).*(..)); • call(void Set*(int)); • Explanation

  6. Advice • Basically a function • before, after, and around key words • around has a special proceed()function • Has access to some information from base code • Function name, parameters, return type, return value

  7. Weaving • Static vs dynamic • Compile-time vs load- or run-time • Invasive vs non-invasive • Directly changing base code or not

  8. Applications Logging Coordination Security Mutual Exclusion

  9. Coordination Silent Single Bid Public English Style

  10. Downsides Confusion about it’s role Anti-pattern: Action at a distance

  11. AspectJ • Java-based • Pointcuts • Can use logical operators • Can be named • Advices are formatted like java functions

  12. AspectJPointcuts pointcutfunctionExecution(): execution(!static * (Class1 || ClassA).*(..)) Name Join point type Join point specification

  13. AspectJPointcuts • Name • Shorter than the pointcut itself • Can include parameters to capture access to an object • pointcut setter(Person p): target(p) && …

  14. AspectJPointcut Types //before call Person.walk(); //after call Private void walk() { //before execution //TODO: write function body //after execution } • Methods and Constructors • call(Signature) / execution(Signature)

  15. AspectJPointcut Types private int id; … //before set id = 42; //after set • Fields • get(Signature) / set(Signature) • E.g. set(int Racer.*)

  16. AspectJPointcut Types • Instanceof checks and context exposure • this(type or id) / target(type or id) / args(type or id) • E.g. args(newval), target(Racer) • Others • http://eclipse.org/aspectj/doc/released/progguide/quick.html#quick-pointcuts

  17. AspectJ Advices void around(Racer r): criticalSection(r) { inti = (int) r.getId(); …proceed(); … } • thisJoinPoint • Can be used to get arguments, signature, target, etc • thisJoinPoint.getArgs();

  18. Example of Mutual Exclusion Aspect

  19. Questions

  20. References [1] Aspect-oriented software development. In Wikipedia. Retrieved October 20, 2013, from http://en.wikipedia.org/wiki/Aspect-oriented_software_development [2] RohitSethi. “Aspect-Oriented Programming and Security”. Retrieved October 28, 2013, from http://www.symantec.com/connect/articles/aspect-oriented-programming-and-security [3] Fuentes, Lidia; Sánchez, Pablo. “Aspect-Oriented Coordination”. In Science Direct. Retrieved from http://www.sciencedirect.com/science/article/pii/S1571066107004926 [4] Aspect Weaver. In Wikipedia. Retrieved October 28, 2013, from http://en.wikipedia.org/wiki/Aspect_weaver [5] Piveta, Eduardo Kessler; Zancanella, Luiz Carlos. “Aspect Weaving Strategies”. In Journal of Universal Computer Science. Retrieved from http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.2.9460&rep=rep1&type=pdf [6] The AspectJ Programming Guide. Retrieved October 28, 2013, from http://eclipse.org/aspectj/doc/released/progguide/index.html

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