SpringFramework 5에서 선보이는 Reactive와 같은 핵심기능이 2017 2017년 12월 샌프란시스코에서 열린 Spring One Platform행사에서 소개된 내용중 Spring Data, Spring Security, Spring WebFlux프로젝트에 녹아져 있는지 살펴봅니다. 또한 이러한 기능들이 어떻게 여러분의 시스템의 반응성을 높이고 효율적으로 동작하게 하는지 알아봅니다.

1. 2018/2/6
김민석
Senior Platform Architect
Pivotal Cloud Foundry
mkim@pivotal.io
1
Core Spring & Reactive
SpringOnePlatform 2017 recap
for Samsung SDS

2. 2
And more…

3. Everything
you need to
transform
Process &
Culture
Build for
change
Tools
Continuously
Improve
Platform
Any App, Every Cloud,
One Platform
PCF 2.0
Tracker / Spring / Concourse
Pivotal Labs
Data / AI
Apps
Culture, tools, and platform

4. 4

5. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
About me
5
• 김민석 (mkim@pivotal.io)
• Platform Architect @ Pivotal
• Big-Data Monitoring System Developer
• Software Architect
• Software Quality Engineer
• Developer
https://www.facebook.com/groups/CloudfoundryKorea
https://www.meetup.com/Seoul-Cloud-Foundry-Meetup

6. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
6
여기서 다루는 세션들
스프링 프로젝트를 이용한 프로그래밍
Reactive Spring (Tue/05)
Reactive Applications on Apache Tomcat and Servlet 3.1
Containers(Tue /05)
Spring Integration 5.0: What's New?(Tue/ 05)
Not Only Reactive - Data Access with Spring Data(Tue /05)
Reactive Data Access with Spring Data (Tue /05)
Under the Hood of Reactive Data Access (Tue/06)
Simplifying Apache Geode with Spring Sata(Wed/06)
JDBC, What is it Good For? (Thu/07)
Spring Security 5: The Reactive Parts(Tue /05)
Bootiful Development with Spring Boot and React (Wed/ 06)
Next Generation OAuth Support with Spring Security 5.0 (Wed/06)
Lessons Learned from Upgrading Thymeleaf (Wed /06)
Why Spring <3 Kotlin( Tue/07)
What's New in Spring AMQP 2.0( Wed/06)
JUnit 5 — New Opportunities for Testing on the JVM(Thu /07)
Spring Core
New in Spring Framework 5.0: Functional Web Framework(Tue/05)
Spring Framework 5.0 on JDK 8 & 9 (Wed /06)
Reactor in Action (Web /06)
Spring Framework 5: Hidden Gems(Wed/06)
It's a Kind of Magic: Under the Covers of Spring Boot (Web /06)
55 New Features in JDK 9 (Thu/ 07)
Servlet or Reactive Stacks: The Choice is Yours. Oh No... The Choice is
Mine!(Tue/ 05)
Design & Architecting
Designing, Implementing, and Using Reactive APIs(Web/06)
Cloud-Native Batch Processing with Spring Batch 4 (Tue /05)
Bringing New Technology to Legacy Land (Tue /05)
State or Events? Which Shall I Keep? (Tue /05)
Kafka Streams - From the Ground Up to the Cloud (Tue /05)
Cloud Event Driven Architectures with Spring Cloud Stream 2.0(Wed/06)
Spring Driven Industrial IoT Utilizing Edge, Fog, and Cloud
Computing( Wed/ 06)

7. 7
1. Spring Framework Core 살펴보기
2. Reactive Programming 개념이해하기
3. Demo
4. 어떻게 적용할 것인가?

8. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/

9. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Reactive

10. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
10
Spring Framework 5.0 Overview
• Back-Pressure(Reactive 데이터 흐름
제어)
• Reactive Spring Data
• Function Reactive Programming
• Project Reactor

11. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
• 6개월 단위 Major release
• Agile development
• JDK9: 2017/09
• JDK10: 2018/03
• JDK11: 2018/09
• LTS support release
• JDK8 (LTS)
• JDK11(LTS)
• 3 years
• No Overlap of support
JDK Release and Support model
Java 8 Adoption(Oct. 2017, Baeldung)
Java 8
Java 7
Java 6 Java 9

12. 12
1. Spring Framework Core 살펴보기
2. Reactive Programming 개념이해하기
3. Demo
4. 어떻게 적용할 것인가?

13. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Servlet and Reactive
Servlet 3.1 (2013)
Reactor (2013)
Servlet1.0 (1997) Servlet 3.0 (2009)

14. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
14
Servlet and Reactive

15. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
15
Servlet and Reactive

16. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
• 대안적 프로그래밍 방식
• 쉽고, 간결하고 에러가 줄어드는 비동기 이벤트 기반 프로그래밍
• 고성능, concurrency 코딩
• Reactive Stream 명세 (http://www.reactive-streams.org/ )
• WebFlux는 다양한 non-blocking API를 지원
Spring WebFlux를 이용한 Reactive Programming

17. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
17
멀티쓰레드 프로그래밍
• Keeping an unused ExecutorService alive
• Wrong thread-pool capacity while using fixed length thread-pool
• Unexpectedly-long blocking with Future‘s get() method

18. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring WebFlux – 기존 RestController 방식

19. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring WebFlux – RouterFunction 방식 (1/2)

20. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring WebFlux – RouterFunction 방식 (2/2)
https://spring.io/blog/2016/09/22/new-in-spring-5-functional-web-framework
https://github.com/myminseok/webflux-functional-mkim

21. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring WebFlux를 이용한 Reactive Programming
https://spring.io/blog/2016/04/19/understanding-reactive-types

22. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Reactive Spring Data – being Reactive

23. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
<T> List<T> findAll(Class<T>
entityClass, String collectionName);
<T> T findOne(Query query,
Class<T> entityClass);
…
<T> Flux<T> findAll(Class<T>
entityClass, String collectionName);
<T> Mono<T> findOne(Query query,
Class<T> entityClass);
…
Reactive Spring Data - ReactiveMongoOperations

24. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Reactive Spring Data - MongoDB

25. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Reactive Spring Integration

26. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Reactive Spring Integration
https://github.com/artembilan/spring-integration-s1p2017

27. 27
1. Spring Framework Core 살펴보기
2. Reactive Programming 개념이해하기
3. Demo
4. 어떻게 적용할 것인가?

28. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
• 샘플: https://github.com/rstoyanchev/demo-reactive-spring
• Spring Webflux
• WebClient
• Reactive Spring Data (@Tailable)
• Streaming Data from Reactive repository to Reactive Client
28
Spring Webflux & Spring Data Demo

29. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
샘플: https://github.com/myminseok/s1p-reactor-in-action
Reactor 테스트
• StepVerifier
Debugging
• Async pipeline을 Debug, tracing하려고 할 때 .checkpoint()를 활용.
Spring WebFlux를 이용한 Reactive Programming

30. 30
1. Spring Framework Core 살펴보기
2. Reactive Programming 개념이해하기
3. Demo
4. 어떻게 적용할 것인가?

31. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
• Networking
• Latency
• Failures
• Back-pressure(Data Flow Control)
• Highly Concurrent Operations
• Scalability
효과적인 Reactive Usecase
https://github.com/cloudfoundry/cf-java-client

32. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
32
Servlet or Reactive?

33. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
If it isn't broken, don’t fix it.
Imperative is simple until it is not
33
Servlet or Reactive?

34. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
• Spring Framework 5.x
• JDK 8 codebase (LTS), JDK9+ compatible
• Support Java EE Level 7( Servlet 3.1, JPA 2.1)
• Prepare to Java EE Level 8 (Servlet 4.x, JPA 2.x)
• Dropped support (Portlet, Velocity, JDO…)
• Spring Framework 5.x +
• Upgrade train(JDK 9->10 ->11(LTS))
• Spring framework 5.x building target to JDK11
• Spring Framework 4.3
• JDK6 codebase, JDK7,8,9 compatible
• Backport from Spring framework 5 (@UsesJava8 …)
34
Spring Framework & JDK 업그레이드 계획하기

35. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
1. JDK Baseline Update
2. Web Servers
3. Libraries
• Jackson 2.9+ Hibernate 5.0+ EhCache 2.10+
4. Removed Packages, Classes and Methods
• Hibernate 5 (orm.hibernate3/hibernate4 dropped)
5. Dropped Support
• Portlet, Velocity, JasperReports, XMLBeans, JDO, Guava (replaced by the
Caffeine support
• Spring Framework 4.3.x (supported until 2020)
6. Common Logging
• spring-jcl
35
Spring Framework 5.0 적용하기
https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x

36. 36
Q&A