Using kotlin for server side development

1. Using Kotlin for Server-
side Development
Ktor 사용해 코틀린 서버 만들기
Grey

2. Advantage of Kotlin
https://kotlinlang.org/docs/reference/server-overview.html

3. Type-safe Builder
Delegated properties
Coroutines

4. Type-safe Builder?
How?

5. Type-safe Builder?
Kotlin Extension
https://www.slideshare.net/YongHaYoo/swift-kotlin-and-modern-languages-80109300

6. Type-safe Builder?

7. Type-safe Builder?

8. Type-safe Builder?

9. Kotlin-based DSLs
Html Android(Anko)
domain-specific languages

10. Kotlin-based DSLsdomain-specific languages
Ktor

11. Type-safe Builder
Delegated properties
Coroutines

12. Delegated properties?

13. Delegated properties?
If someCondition fails, the variable won’t be computed at all
Ex1
Ex2
//computed
//Hello
//Hello

14. Delegated properties?
//first -> second
Ex3

15. Type-safe Builder
Delegated properties
Coroutines

16. Coroutines?
coroutines not only open the doors to asynchronous programming, but also
provide a wealth of other possibilities such as concurrency, actors, etc.
https://kotlinlang.org/docs/reference/coroutines-overview.html

17. Coroutines?
https://kotlinlang.org/docs/reference/
coroutines/basics.html

18. Sommelier

19. What I want to make?
Sommelier Qanda-Config-Managing-Application

20. What I want to make?
DataScientist, Manager can dynamically
control config’s condition on dashboard

21. What I want to make?
os
Version
Locale
UserId
Android iOS
>=2105 <2105
==ko_KR
==ja_JP
Feed_Pick_On Feed_Pick_Off
Feed_Pick_On

22. What I want to make?
@Deprecated(“String Constant in qanda”)

23. What I want to make?
@Deprecated(“Jarvis is very inefficient”)

24. Why don’t you update jarvis
instead sommelier?
A. I don’t like the name of ‘jarvis’
A. I want to practice to new server deployment.
A. Kotlin based server looked interesting.
A. I’m not interesting on golang

25. 이 PPT 만들 시간에 개발을 했어야 했는데…

26. Ktor

27. Ktor
https://ktor.io/

28. Quick Start
embeddedServer Netty

29. Quick Start
Module

30. Quick Start
Routing

31. Ktor Lifecycle
https://ktor.io/servers/lifecycle.html

32. Exposed
Setting up Exposed
Exposed is another JetBrains sponsored library for database interactions in Kotlin. It is a kind
of ORM, but unlike Hibernate it’s very simple and lightweight. In this post we’re going to use H2 as a
simple in-memory database and HikariCP for connection pooling. Add the following dependencies:
Exposed is a prototype for a lightweight SQL library written over JDBC driver for Kotlin language. It does have
two layers of database access: typesafe SQL wrapping DSL and lightweight data access objects
Exposed is currently available for maven/gradle builds at https://bintray.com/kotlin/exposed/exposed/view#
Kotlin SQL Library
https://github.com/JetBrains/Exposed

33. Quick Start
Routing

34. Conclusion
Welcome to Kotlin Server
Welcome to Jetbrain world
자바 서버를 코틀린으로 컨버팅한다면 매우 좋아요.
그냥 첫 서버로 코틀린으로 시작하는 것은 글쎄요
젯브레인을 싫어한다면 코틀린은 글쎄요…

35. 끝