Aspect Oriented Development
Aspect Oriented DevelopmentAlex BeattyPurposeCross-cutting
ConcernsJoin Points, Pointcuts, and AdvicesWeavingInvasive vs.
Non-InvasiveStatic vs. Dynamic
IntroductionWhat is a cross-cutting concern?ExamplesReduction of
code tangling and code scatteringAbstractionObliviousnessExpert
DevelopmentObject ReusePurposeJoin Point - Point in the base code
that aspect code can utilizedExamplesA method being calledA methods
code being runInitialization
Join PointsUser defined join point(s) to utilize aspect code
withAspectJ examplesexecution(!static * (Class1 ||
ClassA).*(..));call(void Set*(int));Explanation
PointcutsBasically a functionbefore, after, and around key
wordsaround has a special proceed() functionHas access to some
information from base codeFunction name, parameters, return type,
return valueAdviceStatic vs dynamicCompile-time vs load- or
run-timeInvasive vs non-invasiveDirectly changing base code or
notWeavingLoggingCoordinationSecurityMutual Exclusion
ApplicationsCoordination
Silent Single BidPublic English StyleConfusion about its
roleAnti-pattern: Action at a
distanceDownsidesJava-basedPointcutsCan use logical operatorsCan be
namedAdvices are formatted like java functions
AspectJpointcut functionExecution(): execution(!static * (Class1
|| ClassA).*(..))NameJoin point typeJoin point specificationAspectJ
PointcutsNameShorter than the pointcut itselfCan include parameters
to capture access to an objectpointcut setter(Person p): target(p)
&& AspectJ PointcutsMethods and Constructorscall(Signature)
/ execution(Signature)
AspectJ Pointcut Types//before callPerson.walk();//after
callPrivate void walk(){//before execution//TODO: write function
body//after execution}Fieldsget(Signature) / set(Signature)E.g.
set(int Racer.*)
AspectJ Pointcut Typesprivate int id; //before setid =
42;//after setInstanceof checks and context exposurethis(type or
id) / target(type or id) / args(type or id)E.g. args(newval),
target(Racer)
Othershttp://eclipse.org/aspectj/doc/released/progguide/quick.html#quick-pointcutsAspectJ
Pointcut Typesvoid around(Racer r): criticalSection(r){ int i =
(int) r.getId(); proceed(); }thisJoinPointCan be used to get
arguments, signature, target, etcthisJoinPoint.getArgs();AspectJ
AdvicesExample of Mutual Exclusion AspectQuestions[1]
Aspect-oriented software development. In Wikipedia. Retrieved
October 20, 2013, from
http://en.wikipedia.org/wiki/Aspect-oriented_software_development[2]
Rohit Sethi. Aspect-Oriented Programming and Security. Retrieved
October 28, 2013, from
http://www.symantec.com/connect/articles/aspect-oriented-programming-and-security[3]
Fuentes, Lidia; Snchez, 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
References
