IoC container from scratch
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The document discusses the Spring framework's implementation of the Inversion of Control (IoC) design pattern. It describes how Spring uses bean definitions to define objects and their dependencies. The Spring IoC container uses this configuration metadata to create and manage beans. It creates bean objects from the configuration and handles injecting their dependencies. This allows for loosely coupled and testable application code.
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IoC container from scratch
- 1. IOC CONTAINER FROM SCRACH ŁUKASZ DZIEDZIUL 1
- 2. 2002 2
- 3. 2002 3
- 4. 2004 4
- 5. 2004 5
- 6. 2005 6
- 7. 2005 7
- 8. 2019 8
- 9. 9
- 10. Co by się stało gdyby Spring zniknął na tydzień…? 10
- 11. 11
- 12. 2020? 12
- 13. 2020? 13 WITHOUT
- 15. SPRING FRAMEWORK ▸ IoC Container ▸ Aspects ▸ Transactions ▸ MVC ▸ JDBC/ORM ▸ … 15
- 16. IOC CONTAINER 16
- 17. IOC CONTAINER ▸ Objects define their dependencies but don’t control instantiation ▸ Instead of a client specifying which service it will use, something tells the client what service to use. 17
- 18. SHOW ME THE CODE 18
- 19. CONTEXT 19
- 20. CONTEXT ▸ Surrounding of bean creation and code execution ▸ Context creation phases: ▸ Gathering info about the beans ▸ Actual bean creation ▸ Populating the context 20
- 21. CONTEXT 21
- 22. CONTEXT 22
- 23. CONTEXT 23
- 24. CONTEXT 24
- 25. CONFIGURATION 25
- 26. CONFIGURATION ▸ List of bean definition along with dependencies 26
- 27. CONFIGURATION 27 ▸ List of bean definition along with dependencies ▸ Types ▸ Xml ▸ Annotations ▸ Java Config
- 28. CONFIGURATION ▸ List of bean definition along with dependencies ▸ Types ▸ Xml ▸ Annotations ▸ Java Config ▸ Non-invasive ▸ Testable ▸ Ready-to-use state of beans 28
- 29. CONFIGURATION 29
- 30. CONFIGURATION 30
- 31. CONFIGURATION 31 ▸ How to use it?
- 32. CONFIGURATION 32 ▸ Plan: simply run all bean methods from configuration objects ▸ How: ▸ Find configurations ▸ Create configurations ▸ Call bean methods
- 36. CONFIGURATION 36
- 37. BEAN DEFINITION ▸ Metadata about the bean: 37
- 38. BEAN DEFINITION ▸ Metadata about the bean: ▸ Bean type 38
- 39. BEAN DEFINITION ▸ Metadata about the bean: ▸ Bean type ▸ Dependencies 39
- 41. BEAN DEFINITION ▸ Metadata about the bean: ▸ Bean type ▸ Dependencies ▸ Instantiation method 41
- 45. BEAN FACTORY 45
- 46. BEAN FACTORY ▸ Creates actual bean from BeanDefinition ▸ Initialises context with beans 46
- 47. BEAN FACTORY 47
- 48. BEAN FACTORY 48
- 49. BEAN FACTORY 49
- 50. BEAN FACTORY 50
- 51. BEAN FACTORY 51
- 52. BEAN FACTORY 52
- 53. MVP? 53
- 54. MVP? 54
- 55. MVP? 55
- 59. SUMMARY 59
- 60. SUMMARY 60
- 61. SPRING FRAMEWORK IMPLEMENTATION ▸ org.springframework.beans.factory.BeanFactory ▸ org.springframework.beans.factory.BeanCurrentlyInCreationException ▸ org.springframework.beans.factory.config.BeanPostProcessor ▸ org.springframework.beans.factory.config.BeanDefinition ▸ org.springframework.beans.factory.support.DefaultSingletonBeanRegistry ▸ org.springframework.context.ApplicationContext 61
- 62. TAKEAWAYS ▸ You know dependency injection - constructors ▸ Spring is simple, additions are hard to understand ▸ Do you need full blown spring boot? Especially for serverless ▸ Make your domain framework agnostic. 62
- 64. HOMEWORK ▸ https://github.com/ldziedziul/diy-ioc-container ▸ Add ▸ Transactions ▸ List of beans ▸ Injection by super types ▸ Circuit breaker ▸ Metrics 64
- 65. LINKS ▸ https://github.com/cbeams/spring-framework-i21 ▸ https://www.jetbrains.com/lp/devecosystem-2019/java/ ▸ https://martinfowler.com/articles/injection.html ▸ https://github.com/ronmamo/reflections 65
- 66. ABOUT ME ▸ @ldziedziul ▸ @jSessionPL ▸ @Programistok ▸ @CasumoTech 66
- 67. QUESTIONS? 67