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AOP and Modular Reasoning [ICSE05]

Explore first principles of modularity and modular reasoning, analyzing how AOP complements OOP and impacts system interfaces. Learn about crosscutting concepts and effective modular design practices.

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AOP and Modular Reasoning [ICSE05]

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  1. AOP and Modular Reasoning [ICSE05] • Start with first-principles definition of modularity and modular reasoning • localization, interfaces, enforcement, composition • Provide example and analysis showing that: • in the presence of ccc, OOP is not modular • in the presence of ccc, AOP is modular • But… • interfaces depend on system configuration • AOP makes that explicit • explains more about what crosscutting means ______ [ICSE05] Kiczales and Mezini. Kiczales and Mezini - FOAL 2005

  2. Crosscutting Structure and Interfaces • Aspect cuts interface • through Point and Line • What crosscutting means • The gestalt of AOP class Line { private Point p1, p2; Point getP1() { return p1; } Point getP2() { return p2; } void setP1(Point p1) { this.p1 = p1; } void setP2(Point p2) { this.p2 = p2; } } aspect UpdateSignaling { private Display Shape.display; publicvoid Shape.setDisplay(Display d) { this.display = d; } pointcut change(Shape shape): this(shape) && (execution(void Shape.moveBy(int, int) || execution(void Shape+.set*(*))); after(Shape s) returning: change(s) { Display.update(s); } } class Point { privateint x = 0, y = 0; int getX() { return x; } int getY() { return y; } void setX(int x) { this.x = x; } void setY(int y) { this.y = y; } } Kiczales and Mezini - FOAL 2005

  3. Parts Kiczales and Mezini - FOAL 2005

  4. m Composed parts • composition determines • both interfaces and component structure Kiczales and Mezini - FOAL 2005

  5. Crosscutting Structure and Interfaces • Parts stay the same • Interfaces are extended • Declarative • What “details” means can change class Line { private Point p1, p2; Point getP1() { return p1; } Point getP2() { return p2; } void setP1(Point p1) { this.p1 = p1; } void setP2(Point p2) { this.p2 = p2; } } aspect UpdateSignaling { private Display Shape.display; publicvoid Shape.setDisplay(Display d) { this.display = d; } pointcut change(Shape shape): this(shape) && (execution(void Shape.moveBy(int, int) || execution(void Shape+.set*(*))); after(Shape s) returning: change(s) { Display.update(s); } } class Point { privateint x = 0, y = 0; int getX() { return x; } int getY() { return y; } void setX(int x) { this.x = x; } void setY(int y) { this.y = y; } } Kiczales and Mezini - FOAL 2005

  6. Why paper matters to us • What theory of AOP should say • interface depends on configuration • “aspect control” systems can account for that • expand “modular” to encompass AOP • that has been the idea for 10 years • Stop focusing on advice and simple pointcuts! • inter-type declarations • more interesting pointcuts (i.e. dflow, pcflow…) • the fun is in saying “there is a well-definable crosscutting interface there,I’m going to define it and program against it” • a chance to play with all that fancy semantics (AOP as a strategic technology) Kiczales and Mezini - FOAL 2005

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