Crafting Reactive Apps with Realm Mobile Platform

Realm is a popular database for mobile used already in thousands of apps in the app stores and deployed on over a billion devices. This talk will show you how you can craft reactive applications, especially if you embrace persistence and state as a central part of your application architecture, by using the unique features of this database. Beyond that it will explore how this can be extended on multiple devices and the server-side with the recently launched Realm Mobile Platform and its synchronization capabilities.

Transcript

1. Crafting Reactive Apps with Realm Mobile Platform Marius Rackwitz @mrackwitz mr@realm.io
2. !"
 Who has heard about Realm before? mr@realm.io
3. !#
 Who has played around with Realm? mr@realm.io
4. !$
 Who has shipped an app with Realm? mr@realm.io
5. The Reactive Manifesto % Responsive & Resilient ' Elastic ⚡ Event-Driven mr@realm.io
6. So do I need ReactiveCocoa, RxSwift, RxJava …?
 None of them. mr@realm.io
7. mr@realm.io Realm Mobile Database
8. What is it?
 What is it not? mr@realm.io
9. Realm is not an ORM.
 
 Realm is the database itself. mr@realm.io
10. Embedded
 NoSQL
 Object-oriented Database mr@realm.io
11. Embedded
 = Built from scratch for mobile mr@realm.io
12. NoSQL
 =Schema-free?
 No, too ine!cient. ) mr@realm.io
13. Object-oriented
 
 mr@realm.io
14. mr@realm.io // Person.swift import UIKit import RealmSwift class Person: Object { dynamic var name = "" dynamic var age = 0 let children = List<Person>() let parents = LinkingObjects(fromType: Person.self, property: "children") } let person = Person() person.name = "Craig" person.age = 47 let realm = try! Realm() try! realm.write { realm.add(person) } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 realmSampleApp Generic iOS Device
15. mr@realm.io // Person.swift import UIKit import RealmSwift class Person: Object { dynamic var name = "" dynamic var age = 0 let children = List<Person>() let parents = LinkingObjects(fromType: Person.self, property: "children") } let person = Person() person.name = "Craig" person.age = 47 let realm = try! Realm() try! realm.write { realm.add(person) } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 realmSampleApp Generic iOS Device // Person.swift import UIKit import RealmSwift class Person: Object { dynamic var name = "" dynamic var age = 0 let children = List<Person>() let parents = LinkingObjects(fromType: Person.self, property: "children") } let person = Person() person.name = "Craig" person.age = 47 let realm = try! Realm() try! realm.write { realm.add(person) } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 realmSampleApp Generic iOS Device
16. Objects all the way down. mr@realm.io
17. mr@realm.io Realm skips the copy. You directly interact with memory-mapped data.
18. What are the implications? mr@realm.io
19. mr@realm.io Modi"cations only in explicit
 write transactions. let person = Person() person.name = "Craig" person.age = 47 let realm = try! Realm() try! realm.write { realm.add(person) } try! realm.write { person.age = 48 } 1 2 3 4 5 6 7 8 9 10 11 12 13 realmSampleApp Generic iOS Device
20. mr@realm.io ACID
21. mr@realm.io Multi
 Version
 Concurrency
 Control Multi
 Version
 Concurrency
 Control
22. mr@realm.io Naïve
23. mr@realm.io MVCC
24. mr@realm.io MVCC
25. mr@realm.io MVCC
26. Built-in Noti"cations mr@realm.io
27. Built-in Noti"cations • File-wide Observation • Fine-grained Noti!cations on Collections • Observe Individual Object Properties mr@realm.io Not all of these features are available yet on all platforms.
28. mr@realm.io Realm Mobile Platform
29. mr@realm.io Deployment
30. Use Cases mr@realm.io
31. mr@realm.io Device Backup
32. mr@realm.io Cross-Device Sync
33. mr@realm.io Real-Time Collaboration
34. mr@realm.io Replace your Backend
35. mr@realm.io ⛔
 Ban JSON
 from your apps.
36. mr@realm.io Swift class Account { dynamic var amount: Money dynamic var currency: Currency } JSON { “amount”: 1000.45, “currency”: “USD” } POST %7B%E2%80%9Camount%E2 %80%9D%3A+1000.45%2C+ %E2%80%9Ccurrency%E2%80 %9D%3A+%E2%80%9CUSD… Dictionary [ “amount”: Double, “currency”: String ] And decode that back on the server…
37. Coupon DC9WP Coupon DC9WP coupon.code = DC9WP coupon.isValid = true 1 2 3 validate() Event Handling mr@realm.io
38. Built-in Noti"cations • Observe All Realms • File-wide Observation • Fine-grained Noti!cations on Collections • Observe Individual Object Properties mr@realm.io
39. mr@realm.io Event Handling Expose an API + + Δ( , ) + + Δ(, ) Δ(, )
40. mr@realm.io
41. Thanks for your attention! 
 Follow me on Twitter / GitHub
 @mrackwitz Get in touch to learn more:
 mr@realm.io mr@realm.io