Flipping the Koin

Slides of the talk I gave at Kotlin/Everywhere in Stockholm, St. Petersburg and Milan

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. Any questions? “
38. Use the tools You Like the most
39. Thanks!