Hello again, folks. I'm running a study project in...

# koin

[Pedro Francisco de Sousa Neto]

Hello again, folks. I'm running a study project in Kotzilla Platform. It's a fresh created project. And I'm very curious in how I can speed up my ViewModel intialization.

I've shared my ViewModel constructor above. And now I'm sharing the other dependencies.

GetUsers.kt

@Factory
class GetUsers(
    private val dao: UserDao
)

AppModule.kt

@Module
@ComponentScan("br.com.velantasistemas.mymoney")
class AppModule {

    @Single
    fun getAppDatabase(): AppDatabase {
        return get(AppDatabase::class.java)
    }

    @Single
    fun getUserDao(): UserDao {
        return getAppDatabase().userDao()
    }
}

DatabaseModule.kt

object DatabaseModule {
    val module = module {
        single<AppDatabase> {
            val context: Context = get()
            return@single Room.databaseBuilder(
                context,
                AppDatabase::class.java, "database-name"
            )
                .allowMainThreadQueries()
                .fallbackToDestructiveMigration(dropAllTables = true)
                .build()
        }
    }
}

Questions:
1. How can I speed this up?
2. Could allowMainThreadQueries be the reason for this slowdown?
3. Do you think this is a good way to handle database and DAO access?
a. I know it's a matter of preference, but I'd really like to hear your thoughts, folks.
4. I remember using Koin's suspend initialization before.
a. Does it help only during app startup, or could it also be beneficial for initializing singletons like the database in this case?

[Kibet Theophilus]

@Pedro Francisco de Sousa Neto do you notice any improvements when you remove allowMainThreadQueries ?

I think @amal could answer your questions better

[Pedro Francisco de Sousa Neto]

Hey, I've did some changes.

[Pedro Francisco de Sousa Neto]

First of all, I've updated my Koin Dependency Injection (Plugin) to version 1.3.1 - in Android Studio. And I was able to discover something really interesting in my project! (CC @Olwethu PISSOT)

The plugin detected the DatabaseModule.module as not used. So I've moved the Room initialization to the getAppDatabase(). And deleted the DatabaseModule file.

Very nice feature, folks!

[Pedro Francisco de Sousa Neto]

Then, I've removed the allowMainThreadQueries(). And refactored the `AppModule`:

@Module
@ComponentScan("br.com.velantasistemas.mymoney")
class AppModule {

    @Single
    fun getAppDatabase(context: Context): AppDatabase {
        return Room.databaseBuilder(
            context = context,
            klass = AppDatabase::class.java, name = "database-name"
        )
            .fallbackToDestructiveMigration(dropAllTables = true)
            .build()
    }

    @Single
    fun getUserDao(context: Context): UserDao {
        return getAppDatabase(context).userDao()
    }
}

[Pedro Francisco de Sousa Neto]

So I ran the app, checked it on the Kotzilla Platform, and voilà!

An optimization of 40,28% (1,44ms)!

[amal]

Great work, @Pedro Francisco de Sousa Neto!