AppModule.kt

@Module
object AppModule {

  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)
  }
}