CoroutineDIModule.kt

//interface 

interface CoroutineDispatcherProvider {
    val main: CoroutineDispatcher
    val io: CoroutineDispatcher
    val default: CoroutineDispatcher
    val unconfirmed: CoroutineDispatcher
}
//initialization using "by lazy"
open class RealCoroutineDispatcherProvider : CoroutineDispatcherProvider {
    override val main: CoroutineDispatcher by lazy { Dispatchers.Main }
    override val io: CoroutineDispatcher by lazy { Dispatchers.IO }
    override val default: CoroutineDispatcher by lazy { Dispatchers.Default }
    override val unconfirmed: CoroutineDispatcher by lazy { Dispatchers.Unconfined }
}
//DI Module "
@InstallIn(SingletonComponent::class)
@Module
class DispatcherModule {
    @Provides
    @Singleton
    fun providesCoroutineDispatcher(): CoroutineDispatcherProvider {
        return RealCoroutineDispatcherProvider()
    }
}