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Inversion of Control
Containers Vs. hand
rolled
How they compare
Agenda

•   A common vocabulary
•   Why use dependency injection
•   From scratch(ish)
•   Summary
•   Questions
A common
vocabulary
Direct control
Object Graph

                           Data Access

              Repository


 Controller                Repository    Data Access

               Service     Repository    Data Access

                           Repository    Data Access
Inversion of Control
Container
Composite Root
Lifecycle
Why use dependency
    injection?
Testable




Thinkstock Images/Comstock/Getty Images
Loosely coupled
Evolvable
Code


From
Scratch(ish)
Summary

•   IoC not always needed
•   Easy to implement IoC
•   Removes complexity
•   Can add complexity
Questions

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Inversion of control containers vs handrolled how they compare