Scaling Android App Development at tiket.com

By : Esa Firman, Sr Android Engineer at tiket.com
Live : https://youtu.be/qhkNL0o7x3o?t=360

Transcript

1. Scaling Android App Development at tiket.com
2. Esa Firman Sr Android Engineer at tiket.com Esa Firman esafirm
8. Agenda Why Bother? Intro to why we need to scale our app development 1 Modularization Strategies, conventions, problems and how we solve it. 2 Looking Forward Possible changes, challenges, things to consider 3
9. :app
10. :app :app :feature_a :feature_b :feature_c :lib_analytic :lib_network :lib_webview FROM THIS TO THIS
11. Why Bother? • Growth of codes and or features • Supporting Multiple App / Configuration • Requirement of new features • Change of organization
12. Why Bother? • Growth of codes and or features • Supporting Multiple App / Configuration • Requirement of new features • Change of organization
13. Pros and Cons Pros • Code is more portable • Code is easier to maintain • Code is easier to test • Clear separation of concern • Clear ownership Cons • More complicated
14. Modularization O’Clock
15. Goals • We want to be productive • We want our architecture to be based on a plugin-like system from code to module declaration • We want strong ownership of the modules • We don’t want a complex setup as our achievement
16. What goes where? • Monorepo or multi repo? Mono for easier readability, simpler collaboration and CI/CD* • We separate our modules to three categories ◦ App - wiring, app configuration ◦ Feature - feature specific component (ex: feature screen, feature repository, feature specific view, feature dagger module) ◦ Library - base classes, common functions
17. What goes where? • HotelActivity • FlightSeatMiniMapView • TiketWebView • AppRatingViewModel • AppStateMiddleware
18. What goes where? • HotelActivity → Feature • FlightSeatMiniMapView → Feature • TiketWebView → Library • AppRatingViewModel → Feature • AppStateMiddleware → Library
19. Project Structure :feature_hotel :lib_analytic :lib_network :app :lib_router
20. Project Structure :feature_hotel :lib_analytic :lib_network :app :lib_router :feature_login
21. // app module dependencies { implementation project(':features:feature_inbox') implementation project(':features:feature_login') implementation project(':features:feature_hotel') } // feature inbox dependencies { implementation project('libraries:lib_analytic') implementation deps.glide } // library analytic dependencies { api project('libraries:lib_network') implementation deps.googleAnalytic }
22. Communication between features • Dependency Inversion • The interface moved to library module ◦ feature_auth → lib_common_auth • The implementation will be provided by feature module through dagger
23. interface AccountDataSource { fun getSessionToken(): String } class AccountRepository(store: AccountStore): AccountDataSource { fun getSessionToken() = store.getSessionToken() } class AccountPublicModule { @Provides fun provideAccountDataSource(store: AccountStore) { return AccountRepository(store) } }
24. interface AccountDataSource { fun getSessionToken(): String } class AccountRepository(store: AccountStore): AccountDataSource { fun getSessionToken() = store.getSessionToken() } class AccountPublicModule { @Provides fun provideAccountDataSource(store: AccountStore) { return AccountRepository(store) } } lib_common_auth feature_auth
25. // app module dependencies { implementation project('features:feature_inbox') implementation project('features:feature_auth') } // feature inbox dependencies { implementation project('libraries:lib_common_auth') }
26. app feature_hotel feature_train lib_router object HotelDetail : Route() object TrainSearch : Route("https://tiket.com/train") // Register TrainSearch.Register { startActivity(this, TrainActivity::class.java) } // Navigate to other screen appRouter.push(TrainSearch) // Handle DeepLink / URI appRouter.goTo("https://tiket.com/train") // Instance creation @Provides fun provideRouter(middleWares: Set<MiddleWare>) = TiketAppRouter(middleWares) // Optional configuration RouterPlugin.logger = { Log.d("router", it) }
28. Route Redirection interface LoggedInRoute : Parcelable object OrderRoute : BaseRoute(), LoggedInRoute class LoginCheckMiddleWare : MiddleWare { override fun onRouting(route: BaseRoute<*>, routeParam: RouteParam) { // Check if is current not logged in if(route is LoggedInRoute && !isLoggedIn) { return MiddleWareResult( LoginRoute, LoginRouteParam(createRedirectParam() ) } return MiddleWareResult(route, routeParam) } }
29. Route Redirection interface LoggedInRoute : Parcelable object OrderRoute : BaseRoute(), LoggedInRoute class LoginCheckMiddleWare : MiddleWare { override fun onRouting(route: BaseRoute<*>, routeParam: RouteParam) { // Check if is current not logged in if(route is LoggedInRoute && !isLoggedIn) { return MiddleWareResult( LoginRoute, LoginRouteParam(createRedirectParam() ) } return MiddleWareResult(route, routeParam) } }
30. Route Redirection interface LoggedInRoute : Parcelable object OrderRoute : BaseRoute(), LoggedInRoute class LoginCheckMiddleWare : MiddleWare { override fun onRouting(route: BaseRoute<*>, routeParam: RouteParam) { // Check if is current not logged in if(route is LoggedInRoute && !isLoggedIn) { return MiddleWareResult( LoginRoute, LoginRouteParam(createRedirectParam() ) } return MiddleWareResult(route, routeParam) } }
31. Route Redirection interface LoggedInRoute : Parcelable object OrderRoute : BaseRoute(), LoggedInRoute class LoginCheckMiddleWare : MiddleWare { override fun onRouting(route: BaseRoute<*>, routeParam: RouteParam) { // Check if is current not logged in if(route is LoggedInRoute && !isLoggedIn) { return MiddleWareResult( LoginRoute, LoginRouteParam(createRedirectParam() ) } return MiddleWareResult(route, routeParam) } }
32. Route Redirection interface LoggedInRoute : Parcelable object OrderRoute : BaseRoute(), LoggedInRoute class LoginCheckMiddleWare : MiddleWare { override fun onRouting(route: BaseRoute<*>, routeParam: RouteParam) { // Check if is current not logged in if(route is LoggedInRoute && !isLoggedIn) { return MiddleWareResult( LoginRoute, LoginRouteParam(createRedirectParam() ) } return MiddleWareResult(route, routeParam) } }
33. Route Initialization class TrainSearchRouterInitializer : RouterInitializer() { override fun onInit(appContext: Context) { // bind the route to the router TrainSearch.register { // call activity / fragment } } }
34. Route Initialization <application> <provider android:name=".InboxRouterInitializer" android:authorities="${applicationId}.router.inbox" android:exported="false" /> </application>
35. Wiring & Configuration • Using Dagger to wire it all up • App wide configuration class that contains dagger’s app component for escape hatch
36. @Singleton @Component(modules=[ InboxPublicModule::class, LoginPublicModule::class ]) interface AppComponent
37. @InstallIn(SingletonComponent::class) @Module class InboxPublicModule { ... } @InstallIn(SingletonComponent::class) @Module class LoginPublicModule { ... }
38. object AppConfig : AppConfigInterface { private lateinit var internalConfig: AppConfigInterface val appComponent: AppComponent get() = internalConfig.appComponent } // Usage val feature = LegacyFeature(AppConfig.appComponent.context)
39. Problem: Hilt in transitive deps If you use @InstallIn in transitive down in dependency tree and you use implementation in gradle, it will not gonna included in the graph
40. Listening to App Event interface AppEventListener { fun onEvent(appEvent: AppEvent) } interface AppEvent { class OnAppReadyEvent(app: Application) : AppEvent }
41. Listening to App Event @IntoSet @provides fun provideAppEventListener() { return InboxAppEventListener(...) }
42. Listening to App Event object AppEventListenerManager { private val appEventListeners by lazy { entryPoint.eventListeners() } fun dispatchEvent(appEvent: AppEvent) { appEventListeners.forEach { it.onEvent(appEvent) } } }
43. Listening to App Event object AppEventListenerManager { private val appEventListeners by lazy { entryPoint.eventListeners() } fun dispatchEvent(appEvent: AppEvent) { appEventListeners.forEach { it.onEvent(appEvent) } } }
44. Listening to App Event class TiketApp: Application @Inject appEventListener : AppEventListener fun onCreate() { ... appEventListener.dispatchEvent(OnAppReadyEvent(this)) } }
45. Iteration Speed • One of the promise of modularization is build speed, and in software development build speed is greatly affect iteration speed • Even if the modularization done right, the actual gain is on parallel computation and more effective incremental build • No to mention… ◦ Times to take us from the start of our app to our feature ◦ Creating specific environment for our development
47. // build.gradle apply from: "deps.${properties.get('miniapp')}.gradle" // deps.inbox.gradle depedendecies { implementation project(':features:feature_inbox') implementation project(':features:feature_login') } // local.properties miniapp=inbox
48. object LauncherConfig { fun launch(appRouter: AppRouterFactory) { appRouter.get().push(InboxEntry.InboxListRoute) } }
49. @Module(includes=[ FakeLoginModule::class ]) object LauncherConfig { fun launch(appRouter: AppRouterFactory) { appRouter.get().push(InboxEntry.InboxListRoute) } }
50. Dealing with legacy module :app feature train feature hotel base classes common
51. Dealing with legacy module :app feature train feature hotel base classes :common :app feature train :lib_base :feature_hotel :common :lib_common_data common data
52. Looking Forward
53. • Separate public and private APIs ◦ Feature hotel → :feature_hotel:impl, :feature_hotel:public • Separate wiring ◦ Feature hotel → :feature_hotel:wiring, :feature_hotel:fake_wiring • No more common modules, separated into tiny specific modules • Separated route module? Even more modules • Might be overkill 🤔 • But….
56. More complicated? • Handling dynamic module? • Swap out file dependency with aar on-demand ◦ Gradle’s Include build?
57. References • Android at Scale @Square: https://www.droidcon.com/media-detail?video=380843878 • Universal Router: https://github.com/esafirm/universal-router • Include build: https://publicobject.com/2021/03/11/includebuild/
58. Going Anywhere? tiket.com! Career & Internship Opportunities www.tiket.com/careers/ Follow Us On: tiket.com peopleattiket People At tiket
59. Si Uya Tinggal di Kenya Beli Rumah Banyak Mainan, Udah Ya Materinya Sekarang Waktunya Pertanyaan Esa Firman Sr Android Engineer at tiket.com Esa Firman esafirm