MongoDB .local Houston 2019: REST-less Mobile Apps: Why Offline-first and Sync Matters for Your App and Business
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The document discusses how mobile app users now expect always-on, responsive experiences from apps regardless of connectivity. Developing apps to meet these expectations is challenging due to variable network conditions. The Realm database is presented as a solution for building "REST-less" offline-first mobile apps that can work seamlessly and reliably even without connectivity through its live data model, implicit syncing, and change notifications. The document provides examples of how Realm can replace custom networking code and enable new use cases for digital transformation at various companies.
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MongoDB .local Houston 2019: REST-less Mobile Apps: Why Offline-first and Sync Matters for Your App and Business
- 2. REST-less Mobile Apps: Why offline-first and sync matters for your App and Business Presented by: Chris Bush, Developer Educator Based on a presentation by: Ian Ward, Principle Solutions Architect Robert Oberhofer, Head of Product Solutions
- 3. Hi, I'm Chris Developer Educator, MongoDB Twitter: @starchfacts LinkedIn: https://linkedin.com/in/chbus
- 4. Great expectations Users expect seamless app experiences
- 7. Expectations are high for mobile apps ALWAYS-ON EXPERIENCE ANYWHERE UX RESPONSIVENESS ZERO-LATENCY FEEL REALTIME & COLLABORATIVE
- 8. Expectations are high for mobile apps ALWAYS-ON EXPERIENCE ANYWHERE UX RESPONSIVENESS ZERO-LATENCY FEEL REALTIME & COLLABORATIVE
- 9. Expectations are high for mobile apps ALWAYS-ON EXPERIENCE ANYWHERE UX RESPONSIVENESS ZERO-LATENCY FEEL REALTIME & COLLABORATIVE
- 10. Expectations are high for mobile apps ALWAYS-ON EXPERIENCE ANYWHERE UX RESPONSIVENESS ZERO-LATENCY FEEL REALTIME & COLLABORATIVE
- 12. This is not easy Beyond "Hello, World"
- 13. Data exchange must be... Reliable & resilient Asynchronous Fast & adaptive Dev friendly
- 14. Effort in the wrong places Networking code ORMs & sqlite Mobile/server dev handoffs Specialized tech
- 15. A hostile environment...? Mobile networks have variable latency Connectivity can be lost at any moment Apps can be shut down spontaneously
- 16. Every stack is different
- 21. REST APIs
- 22. REST APIs Great for passive data sources Not so great as backends for complex apps
- 23. REST APIs You are responsible for: • Conflict resolution • Recovery from network failure • Type/schema validation • Encoding and decoding objects
- 26. Let Realm handle this
- 27. What is Realm? A database and a company? Sounds familiar.
- 30. Open source, loved by devs Realm's open-source on-device database: 100k+ developers using it 65% of Fortune 1000 using it 2B+ app installs 50k+ GitHub stars 18k+ Twitter followers Active community involvement
- 31. Open source, loved by devs Designed and built for mobile Just objects using idiomatic code Live objects update automatically The database is the data model
- 32. 3 components of Realm
- 33. Realm Server Real-time sync Automatic conflict resolution Flexible schema change support Event handling
- 34. Realm Mobile Database Offline-first API Object interface with native relationship support Change notifications to keep UI up-to-date Abstracts network handling
- 35. Realm Sync Implicit sync on write Deterministic, strong eventually-consistent conflict resolution Efficient data exchange: compressed, field-level diffs Two modes: full and subset (query) sync
- 36. A quick protocol comparison
- 37. A new paradigm
- 38. Realm replaces... Custom code REST offload App-specific distributed systems development Per-platform network stacks
- 39. ...with Productivity: always-on for frontline workers Efficiency: cross-platform and multi-language support Revenue & retention: responsive, satisfying UX Flexibility: any device, any time, anywhere
- 40. Your classes are the models import RealmSwift // Define your models like regular Swift classes class Dog: Object { @objc dynamic var name = "" @objc dynamic var age = 0 } class Person: Object { @objc dynamic var name = "" @objc dynamic var picture: Data? = nil // optionals ok let dogs = List<Dog>() // references to other objects ok }
- 41. Your classes are the models // Use them like regular Swift objects let myDog = Dog() myDog.name = "Rex" myDog.age = 1 print("name of dog: (myDog.name)")
- 42. Objects are live // Get the default Realm let realm = try! Realm() // Query Realm for all dogs less than 2 years old let puppies = realm.objects(Dog.self).filter("age < 2") puppies.count // => 0 because no dogs have been added to the Realm yet // Persist your data easily try! realm.write { realm.add(myDog) } // Live objects reflect the actual state puppies.count // => 1
- 43. Objects are live // Get the default Realm let realm = try! Realm() // Query Realm for all dogs less than 2 years old let puppies = realm.objects(Dog.self).filter("age < 2") puppies.count // => 0 because no dogs have been added to the Realm yet // Persist your data easily try! realm.write { realm.add(myDog) } // Live objects reflect the actual state puppies.count // => 1
- 44. Objects are live // Get the default Realm let realm = try! Realm() // Query Realm for all dogs less than 2 years old let puppies = realm.objects(Dog.self).filter("age < 2") puppies.count // => 0 because no dogs have been added to the Realm yet // Persist your data easily try! realm.write { realm.add(myDog) } // Live objects reflect the actual state puppies.count // => 1
- 45. Objects are live // Get the default Realm let realm = try! Realm() // Query Realm for all dogs less than 2 years old let puppies = realm.objects(Dog.self).filter("age < 2") puppies.count // => 0 because no dogs have been added to the Realm yet // Persist your data easily try! realm.write { realm.add(myDog) } // Live objects reflect the actual state puppies.count // => 1
- 46. Objects are live // Get the default Realm let realm = try! Realm() // Query Realm for all dogs less than 2 years old let puppies = realm.objects(Dog.self).filter("age < 2") puppies.count // => 0 because no dogs have been added to the Realm yet // Persist your data easily try! realm.write { realm.add(myDog) } // Live objects reflect the actual state puppies.count // => 1
- 47. Objects are live // Get the default Realm let realm = try! Realm() // Query Realm for all dogs less than 2 years old let puppies = realm.objects(Dog.self).filter("age < 2") puppies.count // => 0 because no dogs have been added to the Realm yet // Persist your data easily try! realm.write { realm.add(myDog) } // Live objects reflect the actual state puppies.count // => 1
- 49. Use cases REST-less mobile apps
- 51. Digital transformation: a major cruise vacation operator
- 52. Digital transformation: Cathay Pacific airline
- 53. Digital transformation: Health care provider with legacy APIs
- 55. Something in common Avoid the communication breakdown
- 57. Users expect seamless experiences
- 58. Meeting these expectations is not easy
- 59. Let Realm handle this
- 61. Thank you!
- 62. Thank you!