Flipping the Koin @ GDG Dev Party

Transcript

1. R O B E R T O O R G

   I U - @ _ t i w i z Flippin’ the Koin

2. Is there a difference? IMPLEMENTATION DI vs SL

3. DI Container Should only call itself Never called by others

   Constructs objects

4. Service Locator Container Dependency

5. I’m not really answering this question WHAT IS DAGGER?

6. @Inject lateinit var myTarget: Target myComponent.inject(this) val myTarget = myComponent.getTarget()

7. insert-koin.io

8. Why I like it Kotlin DSL Quick setup Easy to

   follow

9. I’m not really answering this question either WHAT IS KOIN?

10. private val target: Target by inject() inline fun <reified T

    : Any> ComponentCallbacks.inject()

11. modules declaration val myModule = module { single<Target> { TargetImpl()

    } factory { (view: View) -> Presenter(view, get() } viewModel { MyViewModel(get()) } }

12. Injection private val target: Target by inject { parametersOf(this) }

13. Injection private val target: Target by inject { parametersOf(this) }

14. Injection private val target: Target by inject { parametersOf(this) }

15. Injection val viewModel: MyViewModel by viewModel()

16. Injection class MyWorker : KoinComponent { override suspend fun doWork():

    Result { val target: Target by inject() ... } }

17. Application startKoin { androidContext(context) androidLogger() modules( listOf(module1,..., moduleN) ) }

18. Let’s talk about testing “

19. JUnit + KoinTest

20. Dependencies koinApplication { androidContext(context) modules(fetchModules()) }.checkModules()

21. Dependencies koinApplication { androidContext(context) modules(fetchModules()) }.checkModules { create<MyClass> { parametersOf(mock1,...,paramN)

    } }

22. Building a test

23. startKoin class MyTest : KoinTest { @Before fun setup() {

    startKoin { androidContext(context) modules(fetchModules()) } } }

24. startKoin class MyTest : KoinTest { @Before fun setup() {

    startKoin { androidContext(context) modules(fetchModules()) } } }

25. startKoin stopKoin class MyTest : KoinTest { @After fun tearDown()

    { stopKoin() } }

26. startKoin stopKoin class MyTest : KoinTest { @After fun tearDown()

    { stopKoin() } }

27. startKoin stopKoin Test

28. class MyTest : KoinTest { @Before fun setup() { startKoin

    {...} } @Test fun my_test() { } }

29. class MyTest : KoinTest { @Before fun setup() { startKoin

    {...} } @Test fun my_test() { } } private val target: Target by inject() declareMock<Target>() given(target).will { throw Exception() }

30. Dagger VS Koin

31. WARNING: Opinionated Ideas ahead

32. We should use Dagger

33. Quick setup

34. Compile time safety Because we all love it.

35. Scalability

36. Maintainability

37. androiddevs.it

38. Use the tools You Like the most

39. Thanks!