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YOU CAN INJECT DEPENDENCIES IN YOUR COMPONENTS, LET'S DO IT.
The document discusses dependency injection and design patterns. It explains two ways to understand patterns - like an architect or by investigating alone and discussing with others. It then covers dependency injection in detail, explaining the principles of inversion of control, dependency inversion and how to implement dependency injection through different steps, from semi-injection to using a container and adding abstractions. The discussion includes examples of how to inject dependencies into services and evolve a dependency injection approach.
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More from Quique Fdez Guerra
YOU CAN INJECT DEPENDENCIES IN YOUR COMPONENTS, LET'S DO IT.
- 1. There are twoways to explain a pattern…
- 2.
- 3. OR THE OTHERWAY
- 4. This strip wasmade by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week FIRST YOU USE IT WITHOUT KNOWLEDGE
- 5. This strip wasmade by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week This strip was made by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week AND YOU DISCOVER THE PATTERN
- 6. This strip wasmade by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week This strip was made by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week YOU INVESTIGATE ALONE
- 7. This strip wasmade by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week This strip was made by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week DISCUSS WITH TEAMMATES
- 8. This strip wasmade by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week This strip was made by CKGrafico mixin some strips from, all the rights are for commitstrip, and their awesome work. Can you help me with a pattern? Ye s! And this is the new pattern to study this week HAVE INTERNAL TRAININGS ABOUT IT
- 9. AND YOU GOTO TALKS, HERE WE ARE!
- 10. YOU CAN INJECT DEPENDENCIESIN YOUR COMPONENTS, LET'S DO IT! QuiqueFdezGuerra SoftwareEngineer PlainConcepts @CKGrafico
- 11. WHY THIS PATTERN? AB - One of the most used patterns in backend for coupling. - If A depends on B and B is broken, you should change A. - A has to manage the life time of B. - Mocking dependencies is not easy. We want to make our classes independent from creating the instance of the dependencies.
- 12. A THE SOLID PRINCIPLE ABIB Dependency Inversion Principle One module should not depend of other module, they both should depend of an abstraction
- 13. Injector (container?) Inversion of Control( IoC ) THE DESIGN PRINCIPLE A B A Creates B? B ☆ Using IoC, when one class depends on other class, the first should not manage the life time of the second, this should be done outside.
- 14. THE (FAMOUS) PATTERN AInjector (container?) IB? B D C E Dependency Injection We should have one object supplies the dependency of another object helping on Inversion of Control, and we should use abstractions to apply Dependency Inversion.
- 15. And how wework with that?
- 16. WE HAVE ASERVICE
- 17. AND WANT TOUSE OTHER SERVICE
- 18. How we usuallyimport our dependencies?
- 19. IMPORTING AN OBJECT’’’’’Singleton’’’’’
- 20. IMPORTING A CLASS’’’’Transient’’’’’
- 21. Congratulations! That wasyour first DI approach
- 22. Object singleton, classtransient, no container, the service has too much responsibility… abstractions?
- 23. First step inthe evolution chain, semi-injection
- 24.
- 25.
- 26. 3rd STEP: INJECTIONWITH CONTAINER
- 27. 4th STEP: REALISTICWORLD
- 28. 5th STEP: ADDINGABSTRACTIONS
- 29. 6th STEP: MOVINGTO COMPONENTS
- 30. Ok, but howcan I do that Quique?
- 31.
- 32.
Editor's Notes
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