Aspect-Oriented Programming with Dependency Injection Mark Seemann - - PowerPoint PPT Presentation

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aspect oriented programming with dependency injection
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Aspect-Oriented Programming with Dependency Injection Mark Seemann - - PowerPoint PPT Presentation

Sep 08, 2023 353 likes •625 views

Aspect-Oriented Programming with Dependency Injection Mark Seemann @ploeh Cross-Cutting Concerns Security Security Auditing Auditing Logging Logging Caching Caching Metering Metering Stability patterns Stability patterns Transactions

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SLIDE 1

Aspect-Oriented Programming with Dependency Injection

Mark Seemann @ploeh

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SLIDE 2

Cross-Cutting Concerns

Security Auditing Logging Caching Metering Stability patterns Transactions Security Auditing Logging Caching Metering Stability patterns Transactions

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SLIDE 3

Objective

  • Single Responsibility Principle
  • Open/Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation

Principle

  • Dependency Inversion

Principle

SOLID

  • Don’t Repeat Yourself

DRY

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SLIDE 4

Staying SOLID

  • Single Responsibility Principle
  • Open/Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation

Principle

  • Dependency Inversion

Principle

SOLID

  • Don’t Repeat Yourself

DRY

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SLIDE 5

Prerequisite

Program to an interface, not an implementation

  • Design

Patterns, 1995

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SLIDE 6

Conjecture

  • It’s always possible to apply a Decorator to an

interface

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SLIDE 7

Using Decorators to add aspects

IFoo ConcreteFoo Client

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SLIDE 8

Using Decorators to add aspects

IFoo AuditingFoo IFoo ConcreteFoo Client

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SLIDE 9

Using Decorators to add aspects

IFoo SecureFoo IFoo AuditingFoo IFoo ConcreteFoo Client

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SLIDE 10

DEMO

Staying SOLID with Decorators

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SLIDE 11

Staying SOLID

  • Single Responsibility Principle
  • Open/Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation

Principle

  • Dependency Inversion

Principle

SOLID

  • Don’t Repeat Yourself

DRY

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SLIDE 12

Staying DRY

  • Single Responsibility Principle
  • Open/Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation

Principle

  • Dependency Inversion

Principle

SOLID

  • Don’t Repeat Yourself

DRY

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SLIDE 13

Dynamic interception

From here

  • n, dynamic

interception is required Commonly supplied by a DI Container

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SLIDE 14

DI Containers with Interception

Castle Windsor Unity Spring.NET LinFu

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SLIDE 15

DEMO

Using a DI Container

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SLIDE 16

Interception

Xyz

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SLIDE 17

Interception

Xyz IFoo XyzFoo Xyz

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SLIDE 18

Interception

Xyz IFoo XyzFoo Xyz IBar XyzBar Xyz

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SLIDE 19

Interception

Xyz IFoo XyzFoo Xyz IBar XyzBar Xyz IBaz XyzBaz Xyz

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SLIDE 20

DEMO

Adding interceptors

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SLIDE 21

Pointcut

Xyz Abc Æøå IFoo ConcreteFoo IBar ConcreteBar IBaz ConcreteBaz

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SLIDE 22

Pointcut

Xyz Abc Æøå IFoo ConcreteFoo IBar ConcreteBar IBaz ConcreteBaz Match

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SLIDE 23

DEMO

Adding a pointcut

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SLIDE 24

Objective

  • Single Responsibility Principle
  • Open/Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation

Principle

  • Dependency Inversion

Principle

SOLID

  • Don’t Repeat Yourself

DRY

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SLIDE 25

Staying SOLID only requires loose coupling Staying DRY requires dynamic interception

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SLIDE 26

MARK SEEMANN

http://blog.ploeh.dk/ @ploeh