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How to write custom IoC framework
- 1. How to write custom IoC created by Anuar Nurmakanov 1
- 2. About me Kazakhstan, Karaganda Lead Software Engineer XP/EngX Practices fan Agile Believer And I love Java! 2
- 3. JEEConf 2017 Program It's me Professional Speakers 3
- 4. 3 things should be done by every developer 4
- 5. Develop your custom framework One of the many frameworks 5
- 6. What for???? to know implementation details 6
- 7. What we need Bean registration Auto search Injection Scopes https://github.com/sshogunn/c ustom-ioc-tdd 7
- 8. DI History 8
- 9. Manual Object Creation JiaoziMachine DoughMachine VegetablesCutter MeetGrinder 9 Dep 1 Dep 2 Dep 1 Dep 1 Dep 2 Dep 1 Dep 2 Dep 1
- 10. 10
- 11. Factories Abstract Factory Factory Method Static Factory Method How much do we win if we use factories? 11
- 12. Service Locator Factory Pattern Service Locator What is difference between factories and service locators? 12
- 13. 13
- 15. IoC vs DI 15
- 16. Timer IoC example Set Up timer Do something 16
- 17. Unit Testing IoC example @Test public void shouldDoDomethingWhenSomethingElseHappened() { //GIVEN //WHEN //THEN } def "#person.name is a #sex.toLowerCase() person"() { expect: person.getSex() == sex where: person || sex new Person(name: "Fred") || "Male" new Person(name: "Wilma") || "Female" } Is called by Is called by 17
- 18. DI and IoC example Who is this magic "injector"? 18
- 21. Spring and Injector? WTF? 21
- 22. Let's do this 22
- 23. XML vs Annotations vs Java Config We will choose annotations 23
- 24. Ingredients Annotations Test Cases Basic Structure Idea! 24
- 25. Injector 25
- 27. Injector Lifecycle Application Life Injector 1 Injector 2 Injector 3 Injector 4 27
- 28. Beans 28
- 29. Register Beans How we can register beans in our framework? 29
- 30. What if I want to register Objects as beans? 30
- 31. “ I have a POJO... How can I make a bean ? Searching for beans 31
- 32. Injection 32
- 33. One day you will have to Inject dependencies 33
- 34. Injection Types Injection Type Constructor Property Classic Types of Injection only 34
- 36. What if I want to inject more than one dependency? 36
- 37. IdentifiersString key vs Type Key vs Composite key 37
- 38. A bean can be identified by type Weapon.class identifies Machete beans Katana beans Fighter.class identifies Fighter beans WiiGame.class identifies HalfLife beans Wii.class identifies Wii beans 38
- 39. What if I have two beans of the same type? 39
- 40. String key identifier TreeSet HashSet How would you identify objects created from this classes, if you asked to do so? 40
- 41. firstSet secondSet treeSet hashSet binaryTree Set hashTable Set set.Binary Tree set.Hashta ble 41
- 42. How it could be with XML <beans ...> <bean id="weapons.Katana" class="Katana"/> <bean id="weapons.Machete" class="Machete"/> <bean id="fighters.Brazilian" class="Fighter"> <constructor-arg ref="weapons.Machete"/> </bean> <bean id="fighters.Ninja" class="Fighter"> <constructor-arg ref="weapons.Katana"/> </bean> </beans> <beans ...> <bean id="set.HashTable" class="java.util.HashSet"/> <bean id="set.BinaryTree" class="java.util.TreeSet"/> </beans> 42
- 43. Katana Weapon String key Type key Key 1: [Weapon.class, "katana"] Key 2: [ Weapon.class, "machete"] Key X: [Training.class, "Dependency Injection"] Key Y: [ Training.class, "Bla-bla-bla Training"] String Key + Type Key 43
- 44. Scope 44
- 46. Singleton Scope A singleton’s context is the injector itself. The life of a singleton is tied to the life of the injector Application Injector 1 Injector 2 Injector ... Injector N 46
- 47. Singleton Scope vs Singleton For Singleton Pattern, it's true, but per For Singleton Scope, it's true, but per 47
- 48. Prototype Singleton life cycle is bound to life cycle of an injector No scope is not bound to life cycle of injector 48
- 50. What if implement all of them? + 1 IoC Monstr 50
- 52. I hope it was not boring =) Questions and answers time! 52
- 53. I am happy to present KZ in JEEConf 2017 53