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Understanding Join Points and Pointcuts in Aspect-Oriented Programming with AspectJ

This guide explores the concepts of join points and pointcuts in AspectJ, an aspect-oriented programming extension for Java. Join points are critical moments in the program's control flow, such as method executions and object instantiations. Pointcuts are used to define a named set of join points, making it easier to establish when advice should be executed. The document outlines the different types of advice (before, after, around) that can be applied at these join points, enhancing modularity and separation of concerns in software engineering.

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Understanding Join Points and Pointcuts in Aspect-Oriented Programming with AspectJ

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  1. CSE403 ● Software engineering ● sp12 Aspect-oriented design and programming AspectJ

  2. Join point • A join point is a well-defined point in the control flow of a program • Immediately before (or after) a method execution starts (or finishes) • Object instantiations • Constructor executions • Field references • Handler executions • Join points are execution-time notions – and each one is different even if it happens due to the exact same piece of source code in a program

  3. Pointcut • A pointcut defines – gives a name to – a set of join points • execution(void Point.setX(int)) • handler(ArrayOutOfBoundsException) • call(*.new(int, int)) • execution(public !static * *(..)) • pointcut setter(): target(Point) && (call(void setX(int)) || call(void setY(int))); • That is, pointcuts are a way to identify a subset of join points in a program execution – a cross-cutting set of join points

  4. advice • Join points exist • Pointcuts are defined • But nothing happens until some code is provided that is to execute when a join point that is part of a pointcut is reached during execution • That code is called advice • AspectJ has three kinds of advice • Before • After • Around

  5. Hello World • http://www.eclipse.org/ajdt/demos/HelloWorldAspectJ.html

  6. http://eclipse.org/aspectj/doc/released/progguide/starting-aspectj.htmlhttp://eclipse.org/aspectj/doc/released/progguide/starting-aspectj.html

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