Welcome to the Real Reactive World

Welcome to the Real Reactive World
Realm World Tour, Seoul, 2017
Sangjoon Moon

Transcript

1. Welcome to the Real Reactive World Realm World Tour, Seoul, 2017 Sangjoon Moon
2. Erik Meijer GOTO 2015 One Hacker Way https://www.youtube.com/watch?v=FvMuPtuvP5w
3. When you want to stay up to date, push not pull Erik Meijer
4. Pull Driven • Too Fast • The Wrong Moment • Slow https://dribbble.com/shots/2141820-Latest-News-Pull-to-Refresh
5. Push Driven https://dribbble.com/shots/1473664-Android-Wear-Clock-App-GIF
6. Push Driven Real-time Data Sync • Realm Mobile Platform • Google Firebase Real-time Database
7. How It Works(Clients) • Authentication • Configuration • Data Sync
8. Authentication(Realm) private var user: SyncUser? func logIn(completion: ((Void)->Void)? = nil) { // You can use SyncUser.current to check logged in user guard user == nil else { completion?() return } let credentials = SyncCredentials.usernamePassword(username: username, password: password) SyncUser.logIn(with: credentials, server: authServerURL) { (user, error) in if let user = user { self.user = user DispatchQueue.main.async { completion?() } } else if let error = error { // handling the error properly } } } Tracking Santa With Realm https://realm.io/news/track-santa-with-realm-swift-database-platform-part-3/
9. Configuration(Realm) // opening a standalone Realm let realm = try! Realm()
10. Configuration(Realm) // Create the configuration for the synced Realm let syncServerURL = URL(string: "realm://localhost:9080/~/ userRealm")! let config = Realm.Configuration(syncConfiguration: SyncConfiguration(user: user, realmURL: syncServerURL)) // Open the remote Realm let realm = try! Realm(configuration: config)
11. Configuration Wrapper(Realm) // SantaRealmManager.swift private func realm(for user: SyncUser?, at syncServerURL: URL) -> Realm? { guard let user = user else { return nil } let syncConfig = SyncConfiguration(user: user, realmURL: syncServerURL) let config = Realm.Configuration(syncConfiguration: syncConfig) guard let realm = try? Realm(configuration: config) else { fatalError("Could not load Realm") } return realm } Tracking Santa With Realm https://realm.io/news/track-santa-with-realm-swift-database-platform-part-4/
12. Configuration Wrapper(Realm) private let realmManager = SantaRealmManager() realmManager.logIn { if let realm = self.realmManager.santaRealm() { let santas = realm.objects(Santa.self) … } } // SantaRealmManager.swift func santaRealm() -> Realm? { return realm(for: user, at: santaRealmURL) } Tracking Santa With Realm https://realm.io/news/track-santa-with-realm-swift-database-platform-part-4/
13. Data Sync(Realm) • Notification(Realm, Collection, Object) • KVO
14. Data Sync(Realm) // Object Notifications var token : NotificationToken? // change is the type of enum. token = stepCounter.addNotificationBlock { change in switch change { case .change(let properties): // PropertyChange is the type of struct for property in properties { if property.name == "steps" && property.newValue as! Int > 1000 { print("Congratulations, you've exceeded 1000 steps.") token = nil } } case .error(let error): print("An error occurred: \(error)") case .deleted: print("The object was deleted.") } }
15. Configuration(Firebase) // application:didFinishLaunchingWithOptions: // Initialize Firebase FIRApp.configure() // Firebase Console // Rules to restrict to authenticated users for the path `messages` { "rules": { "messages": { ".read": "auth != null", ".write": "auth != null" } } }
16. By default, read and write access to your database is restricted so only authenticated users can read or write data. Firebase Docs https://firebase.google.com/docs/database/ios/read-and-write
17. Authentication(Firebase) // google account sign in func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error?) { if let error = error { print("Error \(error)") return } guard let authentication = user.authentication else { return } let credential = FIRGoogleAuthProvider.credential(withIDToken: authentication.idToken, accessToken: authentication.accessToken) FIRAuth.auth()?.signIn(with: credential) { (user, error) in if let error = error { print("Error \(error)") return } } }
18. Data Sync(Firebase) var ref: FIRDatabaseReference! fileprivate var _refHandle: FIRDatabaseHandle? func updateUI() { ref = FIRDatabase.database().reference() // Listen for new messages in the Firebase database _refHandle = self.ref.child("condition").observe(.value, with: { [weak self] (snapshot) -> Void in guard let strongSelf = self else { return } strongSelf.conditionLabel.text = snapshot.value as? String }) } deinit { // If an observer isn't properly removed, it continues to sync data to local memory if let refHandle = _refHandle { ref.child("condition").removeObserver(withHandle: refHandle) } } Firebase Database Demo https://www.youtube.com/watch?v=joVi3thZOqc
19. ROS / Firebase • Data Structure(Realm Model / JSON) • Hosting Types • Server Event Handling • Dashboard • Offline Capabilities
20. Summary • Push Driven • Auth, Config, Data Sync • Build Better Apps Faster
21. Questions? Sangjoon Moon iceblue.dev@gmail.com dakeshi@github