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IoC container from scratch
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 ŁUKASZDZIEDZIUL 1
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- 10. Co by sięstało gdyby Spring zniknął na tydzień…? 10
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- 15. SPRING FRAMEWORK ▸ IoCContainer ▸ Aspects ▸ Transactions ▸ MVC ▸ JDBC/ORM ▸ … 15
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- 17. IOC CONTAINER ▸ Objectsdefine 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 THECODE 18
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- 20. CONTEXT ▸ Surrounding ofbean creation and code execution ▸ Context creation phases: ▸ Gathering info about the beans ▸ Actual bean creation ▸ Populating the context 20
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- 26. CONFIGURATION ▸ List ofbean definition along with dependencies 26
- 27. CONFIGURATION 27 ▸ List ofbean definition along with dependencies ▸ Types ▸ Xml ▸ Annotations ▸ Java Config
- 28. CONFIGURATION ▸ List ofbean definition along with dependencies ▸ Types ▸ Xml ▸ Annotations ▸ Java Config ▸ Non-invasive ▸ Testable ▸ Ready-to-use state of beans 28
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- 31. CONFIGURATION 31 ▸ How touse it?
- 32. CONFIGURATION 32 ▸ Plan: simplyrun all bean methods from configuration objects ▸ How: ▸ Find configurations ▸ Create configurations ▸ Call bean methods
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- 37. BEAN DEFINITION ▸ Metadataabout the bean: 37
- 38. BEAN DEFINITION ▸ Metadataabout the bean: ▸ Bean type 38
- 39. BEAN DEFINITION ▸ Metadataabout the bean: ▸ Bean type ▸ Dependencies 39
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- 41. BEAN DEFINITION ▸ Metadataabout the bean: ▸ Bean type ▸ Dependencies ▸ Instantiation method 41
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- 46. BEAN FACTORY ▸ Createsactual bean from BeanDefinition ▸ Initialises context with beans 46
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- 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 knowdependency 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
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- 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
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