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@rbusarow
What’s Koin?
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What’s Koin?
@rbusarow
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What’s Koin?
@rbusarow
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What’s Koin?
@rbusarow
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Screen ViewModel
UserId
Repository
Dao
Room
Database
App Context
Service Retrofit OkHttpClient
Base Url
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Normal Control Flow
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class UserRepository {
internal val service: UserService = retrofit.create()
internal val dao: UserDao = database.userDao
}
Normal Control Flow
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class UserRepository {
internal val okHttpClient: OkHttpClient = OkHttpClient()
internal val retrofit: Retrofit = Retrofit.Builder()
.baseUrl("https://example.dev")
.client(okHttpClient)
.build()
internal val database: Database = Database.init(APP_CONTEXT)
internal val service: UserService = retrofit.create()
internal val dao: UserDao = database.userDao
}
Normal Control Flow
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class UserRepository {
internal val okHttpClient: OkHttpClient = OkHttpClient()
internal val retrofit: Retrofit = Retrofit.Builder()
.baseUrl("https://example.dev")
.client(okHttpClient)
.build()
internal val database: Database = Database.init(APP_CONTEXT)
internal val service: UserService = retrofit.create()
internal val dao: UserDao = database.userDao
}
Normal Control Flow
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Inversion of Control
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Service Location
Dependency Injection
Inversion of Control
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Service Location
Dependency Injection
class UserViewModel {
private val repository = Locator.createRepository()
}
Inversion of Control
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Service Location
Dependency Injection
class UserViewModel {
private val repository = Locator.createRepository()
}
class UserViewModel(val repository: UserRepository) {
lateinit var otherDependency : OtherDependency
}
Inversion of Control
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Field Injection
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class UserScreen : Fragment() {
lateinit var viewModel: UserViewModel
}
Field Injection
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class UserScreen : Fragment() {
lateinit var viewModel: UserViewModel
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
object Injector {
fun inject(screen: UserScreen) {
screen.viewModel = TODO()
}
}
@rbusarow
Field Injection
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class UserScreen : Fragment() {
lateinit var viewModel: UserViewModel
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
object Injector {
fun inject(screen: UserScreen) {
screen.viewModel = TODO()
}
}
@rbusarow
Field Injection
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class UserScreen : Fragment() {
lateinit var viewModel: UserViewModel
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
object Injector {
fun inject(screen: UserScreen) {
screen.viewModel = TODO()
}
}
Field Injection
public
mutable
late init
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Constructor Injection
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class UserRepository(
private val service: UserService,
private val dao: UserDao
) { … }
Constructor Injection
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class UserViewModel {
val repository = UserRepository(service = TODO(), dao = TODO())
}
Constructor Injection
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class UserViewModel {
val client = OkHttpClient()
val retrofit = Retrofit.Builder()
.baseUrl("https://example.dev")
.client(client)
.build()
val service = retrofit.create()
val database = Database.init(APP_CONTEXT)
val dao = database.userDao
val repository = UserRepository(service = service, dao = dao)
}
Constructor Injection
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class UserViewModel {
val client = OkHttpClient()
val retrofit = Retrofit.Builder()
.baseUrl("https://example.dev")
.client(client)
.build()
val service = retrofit.create()
val database = Database.init(APP_CONTEXT)
val dao = database.userDao
val repository = UserRepository(service = service, dao = dao)
}
Constructor Injection
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class UserViewModel(service: UserService, dao: UserDao) {
val repository = UserRepository(service = service, dao = dao)
}
Constructor Injection
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class UserViewModel(
private val repository: UserRepository
) : ViewModel()
Constructor Injection
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class UserScreen : Fragment() {
val viewModel = UserViewModel(repository = TODO())
}
Constructor Injection
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class UserScreen : Fragment() {
lateinit var viewModel : UserViewModel
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
Field Injection…
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class UserScreen : Fragment() {
lateinit var viewModel : UserViewModel
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
Field Injection…
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Service Location
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class UserScreen : Fragment() {
private val viewModel by lazy {
ViewModelProviders
.of(this)
.get(UserViewModel::class.java)
}
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
Service Location
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class UserScreen : Fragment() {
private val viewModel by lazy { Locator.get() }
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
Service Location
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class UserScreen : Fragment() {
private val viewModel by lazy { Locator.get() }
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
Service Location
object Locator {
inline fun get(): T = …
}
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class UserScreen : Fragment() {
private val presenter by lazy { Locator.get() }
private val viewModel by lazy { Locator.get() }
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
Service Location
object Locator {
inline fun get(): T = …
}
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class UserScreen : Fragment() {
private val presenter by lazy { Locator.instance.get() }
private val viewModel by lazy { Locator.instance.get() }
override fun onAttach(context: Context) {
Injector.inject(this)
super.onAttach(context)
}
}
interface Locator {
fun get(): T = …
companion object {
lateinit var instance: Locator
}
}
Service Location
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@rbusarow
Koin
KoinApplication
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class Koin {
val graph: Graph
fun inject(): Lazy
fun get(): T
fun bind(s: S): S
fun createScope(scopeId: ScopeID, qualifier: Qualifier): Scope
}
class KoinApplication {
val koin = Koin()
fun modules(modules: List): KoinApplication
fun logger(logger: Logger): KoinApplication
fun unloadModules(modules: List)
fun close()
}
@rbusarow
Koin & KoinApplication
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class Koin {
val graph: Graph
fun inject(): Lazy
fun get(): T
fun bind(s: S): S
fun createScope(scopeId: ScopeID, qualifier: Qualifier): Scope
}
class KoinApplication {
val koin = Koin()
fun modules(modules: List): KoinApplication
fun logger(logger: Logger): KoinApplication
fun unloadModules(modules: List)
fun close()
}
@rbusarow
Koin & KoinApplication
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class Koin {
val graph: Graph
fun inject(): Lazy
fun get(): T
fun bind(s: S): S
fun createScope(scopeId: ScopeID, qualifier: Qualifier): Scope
}
class KoinApplication {
val koin = Koin()
fun modules(modules: List): KoinApplication
fun logger(logger: Logger): KoinApplication
fun unloadModules(modules: List)
fun close()
}
@rbusarow
Koin & KoinApplication
Not an Android Application
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GlobalContext
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object GlobalContext {
internal var app: KoinApplication? = null
fun get(): KoinApplication
fun getOrNull(): KoinApplication?
fun start(koinApplication: KoinApplication)
fun stop() = synchronized(this) {
app?.close()
app = null
}
}
GlobalContext
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startKoin( )
koinApplication( )
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fun startKoin(appDeclaration: KoinAppDeclaration): KoinApplication {
val koinApplication = KoinApplication.create()
GlobalContext.start(koinApplication)
appDeclaration(koinApplication)
koinApplication.createEagerInstances()
return koinApplication
}
fun koinApplication(appDeclaration: KoinAppDeclaration): KoinApplication {
val koinApplication = KoinApplication.create()
appDeclaration(koinApplication)
return koinApplication
}
startKoin & koinApplication
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fun startKoin(appDeclaration: KoinAppDeclaration): KoinApplication {
val koinApplication = KoinApplication.create()
GlobalContext.start(koinApplication)
appDeclaration(koinApplication)
koinApplication.createEagerInstances()
return koinApplication
}
fun koinApplication(appDeclaration: KoinAppDeclaration): KoinApplication {
val koinApplication = KoinApplication.create()
appDeclaration(koinApplication)
return koinApplication
}
startKoin & koinApplication
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@rbusarow
fun startKoin(appDeclaration: KoinAppDeclaration): KoinApplication {
val koinApplication = KoinApplication.create()
GlobalContext.start(koinApplication)
appDeclaration(koinApplication)
koinApplication.createEagerInstances()
return koinApplication
}
fun koinApplication(appDeclaration: KoinAppDeclaration): KoinApplication {
val koinApplication = KoinApplication.create()
appDeclaration(koinApplication)
return koinApplication
}
startKoin & koinApplication
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@rbusarow
class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
}
}
MyApplication.kt
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class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
startKoin {
// route all Koin logs through android.util.Log
androidLogger()
}
}
}
MyApplication.kt
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private class TimberLogger(level: Level = Level.INFO) : Logger(level) {
override fun log(level: Level, msg: MESSAGE) {
if (this.level <= level) {
when (this.level) {
Level.DEBUG -> Timber.tag(KOIN_TAG).d(msg)
Level.INFO -> Timber.tag(KOIN_TAG).i(msg)
Level.ERROR -> Timber.tag(KOIN_TAG).e(msg)
}
}
}
}
fun KoinApplication.timberLogger(level: Level = Level.INFO):
KoinApplication {
KoinApplication.logger = TimberLogger(level)
return this
}
TimberLogger.kt
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class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
Timber.plant(DebugTree())
startKoin {
// route all Koin logs through Timber
timberLogger()
}
}
}
MyApplication.kt
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class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
Timber.plant(DebugTree())
startKoin {
// route all Koin logs through Timber
timberLogger()
// provide Application context to the graph
androidContext(this@MyApplication)
}
}
}
MyApplication.kt
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class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
Timber.plant(DebugTree())
startKoin {
// route all Koin logs through Timber
timberLogger()
// provide Application context to the graph
androidContext(this@MyApplication)
modules(koinDemoModules)
}
}
}
MyApplication.kt
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@rbusarow
Modules
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@rbusarow
val dataModule = module { }
Modules
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val dataModule = module {
factory { }
}
Modules
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val dataModule = module {
factory { UserRepository() }
}
Modules
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val dataModule = module {
factory {
Timber.v("Hello everyone!")
UserRepository().also {
Timber.v("Goodbye!")
}
}
}
Modules
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val dataModule = module {
factory { UserRepository() }
}
Modules
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val dataModule = module {
factory { UserRepository() }
}
Modules
BeanDefinition
Component
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@rbusarow
Connecting the Graph
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class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
Timber.plant(DebugTree())
startKoin {
// route all Koin logs through Timber
timberLogger()
// provide Application context to the graph
androidContext(this@MyApplication)
modules(koinDemoModules)
}
}
}
@rbusarow
Connecting the Graph
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class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
Timber.plant(DebugTree())
startKoin {
// route all Koin logs through Timber
timberLogger()
// provide Application context to the graph
androidContext(this@MyApplication)
modules(koinDemoModules)
}
}
}
@rbusarow
Connecting the Graph
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@rbusarow
val koinDemoModules: List
get() = emptyListOf()
val dataModule = module {
factory { UserRepository() }
}
Connecting the Graph
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val koinDemoModules: List
get() = listOf(dataModule)
val dataModule = module {
factory { UserRepository() }
}
Connecting the Graph
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@rbusarow
class UserRepository {
internal val database: Database = Database.init(APP_CONTEXT)
internal val okHttpClient: OkHttpClient = OkHttpClient()
internal val retrofit: Retrofit = Retrofit.Builder()
.baseUrl("https://example.dev")
.client(okHttpClient)
.build()
internal val service: UserService = retrofit.create()
internal val dao: UserDao = database.userDao
}
Connecting the Graph
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@rbusarow
class UserRepository(
private val service: UserService,
private val dao: UserDao
) {
…
}
Modules
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@rbusarow
val dataModule = module {
factory { UserRepository() }
}
Connecting the Graph
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@rbusarow
val dataModule = module {
factory { Repository(service = get(), dao = get()) }
}
Modules
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@rbusarow
val dataModule = module {
factory { TODO() }
factory { TODO() }
factory { UserRepository(service = get(), dao = get()) }
}
Connecting the Graph
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val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { TODO() }
factory { UserRepository(service = get(), dao = get()) }
}
@rbusarow
Connecting the Graph
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val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { TODO() }
factory { UserRepository(service = get(), dao = get()) }
}
@rbusarow
Connecting the Graph
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val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { Database.init(androidContext()) }
factory { get().userDao }
factory { UserRepository(service = get(), dao = get()) }
}
@rbusarow
Connecting the Graph
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val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { Database.init(androidContext()) }
factory { get().userDao }
factory { UserRepository(service = get(), dao = get()) }
}
@rbusarow
Connecting the Graph
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@rbusarow
Connecting the Graph
val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { Database.init(androidContext()) }
factory { get().userDao }
factory { UserRepository(service = get(), dao = get()) }
}
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@rbusarow
Modules
val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { Database.init(androidContext()) }
factory { get().userDao }
factory { UserRepository(service = get(), dao = get()) }
}
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@rbusarow
Modules
val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { Database.init(androidContext()) }
factory { get().userDao }
factory { UserRepository(service = get(), dao = get()) }
}
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val dataModule = module {
factory { OkHttpClient() }
factory {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
factory { get().create() }
factory { Database.init(androidContext()) }
factory { get().userDao }
factory { UserRepository(service = get(), dao = get()) }
}
@rbusarow
Connecting the Graph
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val dataModule = module {
single { OkHttpClient() }
single {
Retrofit.Builder()
.baseUrl("https://example.dev")
.client(get())
.build()
}
single { get().create() }
single { Database.init(androidContext()) }
factory { get().userDao }
single { UserRepository(service = get(), dao = get()) }
}
@rbusarow
Modules
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@rbusarow
Accessing the Graph
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@rbusarow
class UserScreen {
val repository: UserRepository = TODO()
}
Accessing the Graph
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@rbusarow
class UserScreen {
val repository = GlobalContext.get().koin.get()
}
Accessing the Graph
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@rbusarow
class UserScreen : KoinComponent {
val repository = get()
}
Accessing the Graph
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@rbusarow
class UserScreen : Fragment() {
val repository = get()
}
Accessing the Graph
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@rbusarow
class UserScreen : Fragment() {
val repository = get()
}
class UserViewModel(private val repository: UserRepository) : ViewModel()
Accessing the Graph
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@rbusarow
val koinDemoModules: List
get() = listOf(dataModule, viewModelModule)
val viewModelModule = module {
viewModel { UserViewModel(repository = get()) }
}
Accessing the Graph
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@rbusarow
val koinDemoModules: List
get() = listOf(dataModule, viewModelModule)
val viewModelModule = module {
viewModel { ViewModel(repository = get()) }
}
Accessing the Graph
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@rbusarow
class UserScreen : Fragment() {
val viewModel = get()
}
class UserViewModel(private val repository: UserRepository) : ViewModel()
Accessing the Graph
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@rbusarow
class UserScreen : Fragment() {
val viewModel by viewModel()
}
class UserViewModel(private val repository: UserRepository) : ViewModel()
Accessing the Graph
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@rbusarow
class UserScreen : Fragment() {
val repository by inject()
val viewModel by viewModel()
}
class UserViewModel(private val repository: UserRepository) : ViewModel()
Accessing the Graph
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@rbusarow
Parameters
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@rbusarow
class UserScreen : Fragment() {
val repository by inject()
val viewModel by viewModel()
}
class UserViewModel(private val repository: UserViewModel) : ViewModel()
Parameters
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@rbusarow
class UserScreen : Fragment() {
val repository by inject()
val viewModel by viewModel()
}
class UserViewModel(
private val userId: String,
private val repository: UserRepository
) : ViewModel()
Parameters
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@rbusarow
class UserScreen : Fragment() {
val repository by inject()
val viewModel by viewModel()
}
class UserViewModel(
private val userId: String,
private val repository: UserRepository
) : ViewModel()
val viewModelModule = module {
viewModel { (userId: String) ->
ViewModel(userId = userId, repository = get())
}
}
Parameters
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@rbusarow
class UserScreen : Fragment() {
val repository by inject()
val viewModel by viewModel { parametersOf(“50 Cent”) }
}
class UserViewModel(
private val userId: String,
private val repository: UserRepository
) : ViewModel()
val viewModelModule = module {
viewModel { (userId: String) ->
UserViewModel(userId = userId, repository = get())
}
}
Parameters
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@rbusarow
Scope
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@rbusarow
val koinDemoModules: List
get() = listOf(dataModule, scopedModule, viewModelModule)
val scopedModule = module {
scoped { Preferences() }
}
Scope
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@rbusarow
val koinDemoModules: List
get() = listOf(dataModule, scopedModule, viewModelModule)
val scopedModule = module {
scoped { Preferences() }
}
object Scopes
val Scopes.login: StringQualifier get() = named("login")
Scope
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@rbusarow
val koinDemoModules: List
get() = listOf(dataModule, scopedModule, viewModelModule)
val scopedModule = module {
scope(scopeName = Scopes.login) {
scoped { Preferences() }
}
}
object Scopes
val Scopes.login: StringQualifier get() = named("login")
Scope
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@rbusarow
val koinDemoModules: List
get() = listOf(dataModule, scopedModule, viewModelModule)
val scopedModule = module {
scope(scopeName = Scopes.login) {
scoped { Preferences() }
}
}
class Anywhere : KoinComponent {
val loginScope = getKoin().createScope(Scopes.login, named("login"))
val preferences by loginScope.inject()
}
Scope
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@rbusarow
class Screen : Fragment() {
val presenter by currentScope.inject()
val viewModel by viewModel()
}
val scopedModule = module {
scope(named()) {
scoped { Presenter() }
}
scope(scopeName = Scopes.login) {
scoped { Preferences() }
}
}
Parameters
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@rbusarow
Testing
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@rbusarow
Overriding Modules
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@rbusarow
internal class UserRepositoryTest {
val service = mockk()
val dao = mockk()
lateinit var repo: UserRepository
@BeforeEach
fun beforeEach() {
repo = UserRepository(service, dao)
}
}
Testing
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@rbusarow
internal class UserRepositoryTest : KoinTest {
val service = mockk()
val dao = mockk()
lateinit var repo: UserRepository
@BeforeEach
fun beforeEach() {
repo = UserRepository(service, dao)
}
}
Testing
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@rbusarow
internal class UserRepositoryTest : KoinTest {
…
@BeforeEach
fun beforeEach() {
startKoin { modules(koinDemoModules) }
repo = get()
}
@AfterEach
fun afterEach() {
getKoin().close()
}
}
Testing
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@rbusarow
internal class UserRepositoryTest : KoinTest {
…
val mocks = module(override = true) {
single { service }
single { dao }
}
@BeforeEach
fun beforeEach() {
startKoin { modules(koinDemoModules) }
repo = get()
}
@AfterEach
fun afterEach() {
getKoin().close()
}
}
Testing
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@rbusarow
internal class UserRepositoryTest : KoinTest {
…
val mocks = module(override = true) {
single { service }
single { dao }
}
@BeforeEach
fun beforeEach() {
startKoin {
modules(koinDemoModules)
modules(mocks)
}
repo = get()
}
…
}
Testing
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@rbusarow
Checking the Graph
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@rbusarow
internal class ModuleTest : KoinTest {
@BeforeEach
fun beforeEach() {
startKoin {
modules(koinDemoModules)
}
}
@AfterEach
fun afterEach() {
getKoin().close()
}
@Test
fun `check modules`() {
getKoin().checkModules()
}
}
Testing
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@rbusarow
Try it yourself!
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@rbusarow
Further Reading
http://bit.ly/322XZr5
http://bit.ly/2L2IfO4
Koin Android documentation:
Koin Core documentation:
Koin Github: http://bit.ly/2ZkTk2d