AppModule.kt

@Module
abstract class AppModule {

  @Module
  companion object {

    private const val HTTP_RESPONSE_CACHE = (10 * 1024 * 1024).toLong()

    @AppScope @Provides @JvmStatic
    fun httpClient(cache: Cache): OkHttpClient {
      if (Looper.getMainLooper() == Looper.myLooper())
        throw IllegalStateException("Initializing OkHttpClient on main thread.")
      return OkHttpClient.Builder()
              .cache(cache)
              .build()
    }

    @AppScope @Provides @JvmStatic
    fun cache(@AppContext context: Context): Cache {
      if (Looper.getMainLooper() == Looper.myLooper())
        throw IllegalStateException("Initializing cache on main thread.")
      return Cache(context.cacheDir, HTTP_RESPONSE_CACHE)
    }
  }
}