Inversion of control containers vs handrolled how they compare

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Nathan Gloyn

Slides from the talk at DDD 10

Technologie Business

@NathanGloyn nathans.dropbox@gmail.com
Design Code Release nathangloyn

Inversion of Control
Containers Vs. hand
rolled
How they compare

Agenda

• A common vocabulary
• Why use dependency injection
• From scratch(ish)
• Summary
• Questions

Object Graph

Data Access

Repository

Controller Repository Data Access

Service Repository Data Access

Repository Data Access

Testable

Thinkstock Images/Comstock/Getty Images

Summary

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

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Inversion of control containers vs handrolled how they compare

1. @NathanGloyn nathans.dropbox@gmail.com Design Code Release nathangloyn Inversion of Control Containers Vs. hand rolled How they compare

2. Agenda • A common vocabulary • Why use dependency injection • From scratch(ish) • Summary • Questions

3. A common vocabulary

4. Direct control

5. Object Graph Data Access Repository Controller Repository Data Access Service Repository Data Access Repository Data Access

6. Inversion of Control

7. Container

8. Composite Root

9. Lifecycle

10. Why use dependency injection?

11. Testable Thinkstock Images/Comstock/Getty Images

12. Loosely coupled

13. Evolvable

14. Code From Scratch(ish)

15. Summary • IoC not always needed • Easy to implement IoC • Removes complexity • Can add complexity

16. Questions