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Introduction to
    Aspect Oriented Programming

by Yan Cui   @theburningmonk
             theburningmonk.com
Server-side Developer @
• Overview
  Cross-Cutting Concerns
  AOP
  What’s in it for you

• AOP
  Terminologies
  AOP and OOP
  Solutions

• Q&A
the PROBLEM...

CROSS-CUTTING CONCERNS
Cross-Cutting Concerns

                  Image by Mike Rohde
• Cuts across multiple abstractions

• Difficult to decompose

• High-coupling

• Boilerplate code
• Code tangling and scattering
  Poor traceability

  Lower productivity

  Less code reuse

  Harder refactoring
the SOLUTION...

ASPECT-ORIENTED PROGRAMMING
“AOP is a programming paradigm which
aims to increase modularity by allowing
the separation of cross-cutting concerns”
  - wikipedia
AOP

      Image by Mike Rohde
• Centralize concerns implementation

• Intercept method calls

• Inject new behaviour

• More reusable code

• Cleaner code
What’s in it for YOU?
• Write less code

• Read less code

• More concise and easy to understand

• More maintainable
• Fewer code = FEWER DEFECTS!
• Less boilerplate code
• More interesting work
• Increased attention
• More PRODUCTIVITY!
dive a little deeper into...

AOP
• Join Point
  Place where behaviour can be added

  start/end of method

  property getter/setter

  ...
• Advice
  Code that’s injected at join points

  Logging

  Validation

  ...
• Point cut
  Join points where advice should be
   applied
• Aspect
  Container holding point cuts and advice

  Aspect is to AOP what class is to OOP
• Weaving
  Combines advices with point cuts
• AOP is complementary to OOP

• AOP targets a specific problem

• Code modularization
  OOP – Real world objects

  AOP – Functionalities
• Help you S.O.L.I.Dify your code
  Single responsibility

  Open/close
• You can do AOP via:
  Dynamic Proxies
  Functional Programming
  Code Generation
  Dynamic Languages
  Static Weaving
AOP via...

DYNAMIC PROXIES
• IoC framesworks
  Castle

  Spring.Net

• Dynamic interceptors
Dynamic Proxies

            Image by Mike Rohde
• Advantages
  Can use existing DI framework

  Built-in aspects (logging, etc.)

  Aspects can be configured after build
• Disadvantages
  Significant change to base code required to adapt
  Limited AOP features
  Do not work on static, non-public methods
  Do not work on fields, properties, or events
  Higher run-time overhead
  No build-time verification
  Objects must be instantiated using the container
NOOOO Sir!!
Class, is AOP the same as
 Dependency Injection?
AOP via...

FUNCTIONAL PROGRAMMING
Functional
 Programming
             Image by Mike Rohde
• Advantages
  No external dependencies
• Disadvantages
  Requires modification to every function

  No support for matching rules

  Manual aspect composition
AOP via...

CODE GENERATION
• T4, CodeSmith tools
• Advantages
  Easy to generate complex source code
• Disadvantages
  Input is usually XML

  Cannot inject new behaviour to existing
  code
AOP via...

DYNAMIC LANGUAGES
Dynamic Languages

              Image by Mike Rohde
• Advantages
  Meta-programming is easy
• Disadvantages
  Switch to a dynamic language can be hard

  No (limited) Visual Studio tooling
AOP via...

STATIC WEAVING
• PostSharp, AspectJ

• Uses low-level MSIL transformation

• Compile time
Requirements

          Aspect Decomposition
Aspects                          Core program


          Aspect Recomposition


            Final System
PostSharp

            Image by Mike Rohde
• Advantages
  Most complete support of AOP features

  Aspect usage is verified at build time

  Better runtime performance
• Disadvantages
  Increased build time

  New to many developers
PostSharp Examples
• Auto-implement INotifyPropertyChanged

• Undo/Redo

• Thread dispatching

• Transaction handling

• Performance Monitoring
• Performance Monitoring
  Method execution time

  Method execution count

  Error count
Record exec time




           Publish to Amazon CloudWatch
• Amazon CloudWatch
  Cheap to run

  Supports alarms and notifications

  Visualization tool
• http://bit.ly/KRDdgr
Thank You!
  @theburningmonk
theburningmonk.com

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