jak aspekty uporządkują twój kod
DESCRIPTION
Prezentacja Barbary Fusińskiej z III edycji konferencji Quality Excites.TRANSCRIPT
Aspect-Oriented Programming
How can aspects clean your code?
Basia Fusińska
About me
Aspect-Oriented ProgrammingHow can aspects clean your code? 2
@basiafusinska
Programmer
Architect
Coach
Manager
Teacher
Trainer
Agenda
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❖ What the hell...are aspects?❖ Some examples of AOP❖ Demo 1: refactor your way to aspects❖ Every-day aspects❖ Demo 2: some not-so-obvious aspects❖ How to test aspects❖ Demo 3: testing in practice❖ Q & A
How can aspects clean your code?Aspect-Oriented Programming
Some history
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❖ Gregor Kiczales (1997), Xerox PARC❖ OOP is unable to solve some common problems❖ Aspects encapsulate cross-cutting concerns and make them easier
to reuse
How can aspects clean your code?Aspect-Oriented Programming
Cross cutting concerns
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❖ Cross-cutting concerns are scattered throughout the code❖ Code becomes difficult to develop and modify❖ Code breaks the Single Responsibility Principle
How can aspects clean your code?Aspect-Oriented Programming
Cross-cutting concerns are everywhere!
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❖ Logging❖ Validation❖ Persistence❖ Caching❖ Synchronization❖ Transactions❖ Exception handling❖ Authentication❖ Authorization❖ ...
How can aspects clean your code?Aspect-Oriented Programming
What the heck are aspects?
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❖ Purpose: cross-cutting concerns – pieces of functionality used across multiple parts of a system
❖ Job: the advice – code that performs cross-cutting concern❖ Map: pointcut – set of joinpoints❖ How: weaving
How can aspects clean your code?Aspect-Oriented Programming
How it works?
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Types of advices?
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❖ Entry❖ Exit❖ Exception❖ Success❖ Around
❖ Method boundaries vs method interceptions
Some benefits of AOP
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❖ Code is cleaner❖ DRY (Don’t Repeat Yourself): promotes code reuse❖ Better encapsulation
How can aspects clean your code?Aspect-Oriented Programming
9How can aspects clean your code?Aspect-Oriented Programming
Demonstration #1Refactor your way to aspects
You’ve been using AOP without knowing it
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❖ IHttpModule - requests boundary aspects❖ IActionFilter - code run before and after the action execution❖ ASP.Net MVC Authentication - AuthorizeAttribute❖ Actions per request (Session Open/Close, ORM changes saving)
How can aspects clean your code?Aspect-Oriented Programming
11How can aspects clean your code?Aspect-Oriented Programming
Demonstration #2Some not-so-obvious aspects
Testing aspects
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❖ Testing the pointcut – testing if aspects were used in correct places❖ Testing the advice – testing if the aspects are doing what they are
supposed to do
How can aspects clean your code?Aspect-Oriented Programming
13How can aspects clean your code?Aspect-Oriented Programming
Demonstration #3Testing aspects
Thank you :)Any questions?
@basiafusinska
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