Kotlin Server Side development

The same talk was given in Android Taipei 2019-9-24
This slide is updated for JCConf 2019 on 2019-10-4

Transcript

1. Kotlin Server-Side Development Using Ktor @chennevin
2. Agenda •Ktor •Android -> Backend
3. Ktor • Easy to Learn • Easy to Use • Client + Server • Features / Middleware • OAuth 2 - Firefox Account • Nice Architecture • Routing + Controller
5. start.ktor.io
6. start.ktor.io
8. Intellij Plugin
9. Auto Sync….
11. My First Server
12. Respond Text
13. Respond… JSON?
14. Content Negotiation
15. Content Negotiation
17. Getting Parameters
18. Features (Middleware)
19. Firefox Account • Internal only— Coming soon! API DOC • OAuth 2.0 (authentication grand type) • authorization • token • profile
20. Ktor Auth (Oauth)
21. Ktor Auth (Oauth)
22. Retrofit :)
23. Architecture (MVC) • RSS API
24. Architecture (Route)
 https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/routes •
25. Route VS Controller
26. Routing HelloRoute.kt
27. Google App Engine • Build highly scalable applications on a fully managed serverless platform • Java 8 + Jetty9 • Java 11 (Beta)+Netty • Sample: Mobile app backend services
28. Google App Engine • Build highly scalable applications on a fully managed serverless platform • Java 8 + Jetty9 • Java 11 (Beta)+Netty • Sample: Mobile app backend services
29. Ktor on App Engine • Follow the document Follow Ktor Doc
30. Add GAE Manually(1)
31. Add GAE Manually(2)
32. Ktor Good Read • Mobile Backends (IO 2019)
 https://www.youtube.com/watch? v=zjWOMBdPbsI&t=517s • KotlinConf Ryan Harter 
 https://www.youtube.com/watch?v=V4PS3IjIzlw
33. Exception Handling[link]
34. • Don’t make exception a part of your business logic • Don’t abuse GlobalExceptionHandler • Use standard Exception • Kotlin doesn’t have checked exception • Cleaner code • Need to look into library method that throws Exception Handling[link]
35. Exception Handling • Don’t make exception a part of your business logic • Don’t abuse GlobalExceptionHandler • Use standard Exception • Kotlin doesn’t have checked exception • Cleaner code • Need to look into library method that throws
36. (Android Dev)->Backend Dev Diff Same RAM IoC Async Testing Killed Application Context Error
37. Annotation Use-site Targets •
39. Armeria • HTTP/2 RPC/REST client/ server library • built on top of Java 8, Netty, Thrift and gRPC https://www.youtube.com/ watch?v=hLlctum1pIA
52. Ktor Route Creation • Extension functions
53. Ktor Route Creation • Extension
54. Ktor Route Creation • Extension Configure
55. Spring Controller Creation
56. Spring Handling Request
57. Ktor Handling Request
58. Take away • Ktor • Introduction • Request / Respond • Features • Firefox Account • Architecture • Deploy to Google App Engine • Backend development for Android dev • Exception Handling • Annotation Use-site Targets • Final / Nullable • Spring / Armeria / Ktor
59. Suggestions… • Use Ktor GAE samples • Use Groovy Gradle build script for now • Be careful fo Intellij 2019.2 (don’t touch offline mode!)
60. Thank you! @chennevin