1. The document discusses Spring bean scopes, including singleton, prototype, request, session, and global session scopes. 2. It notes that prototype scope creates a new bean instance each time it is requested, while singleton scope creates a single instance per Spring container. 3. The document cautions that prototype beans can cause stateful pollution if injected into stateless beans, and recommends that objects holding state typically should not be Spring beans.

1. Week4. ( , CGlib)
Section 5.
11 1
Covenant Ko
2021. 06. 16(Wed)

2. - Name. Covenant.
- Company. 11번가
- Github 용감한친구들 Organization Founder & Maintainer. https://github.com/brave-people
- Github. https://github.com/KoEonYack
- Tech Blog. https://covenant.tistory.com/ (누적 방문 41만)

3. Singleton Bean

4. Singleton Bean
1. Thread-safe
2. Stateless

5. Bean Scopes
Singleton
Prototype
Request
Session
Global Session
https://www.tutorialspoint.com/spring/spring_bean_scopes.htm
https://examples.javacodegeeks.com/enterprise-java/spring/spring-prototype-bean-scope-example/
Scopes the bean definition to a single instance per Spring IoC container (default).
Scopes a single bean definition to the lifecycle of an HTTP Session
A new bean instance is created each time the bean is requested from the IOC container
A single bean instance is created and available during the lifecycle of the HTTP request
Scopes a bean definition to a global HTTP session.
Application
Web
Creates the bean instance for the lifecycle of a ServletContext.

6. Bean Scopes
Singleton
Prototype
Request
Session
Global Session
https://www.tutorialspoint.com/spring/spring_bean_scopes.htm
https://examples.javacodegeeks.com/enterprise-java/spring/spring-prototype-bean-scope-example/
Scopes the bean definition to a single instance per Spring IoC container (default).
Scopes a single bean definition to the lifecycle of an HTTP Session
A new bean instance is created each time the bean is requested from the IOC container
A single bean instance is created and available during the lifecycle of the HTTP request
Scopes a bean definition to a global HTTP session.
Application
Web
Creates the bean instance for the lifecycle of a ServletContext.
밥먹듯이 쓰는애
왜있는지 모르는 친구들..

7. As someone who previously worked at SpringSource and have talked to the developers on
this topic. Here is my take. Prototype is great for testing things out, hence the name
prototype and not createnew or something more description of creating a new instance of
the bean each and every time you request it from the Spring container.
I have also found in my use over the years that I cannot thing of any other place where
prototype makes sense in any real world production application. If your object holds state,
it typically shouldn't be a Spring bean. I have found in all the applications I have worked
on that all beans are Services, Repositories, and Singleton non state holding objects
where I need to add features like Transactionality, JPA, JMS and the likes that give us the
enterprise features that POJOs don't have.
Bean Prototype Scopes Use Cases
Stackoverflow Spring prototype scope - Use Cases?
https://stackoverflow.com/questions/9664810/spring-prototype-scope-use-cases

8. As someone who previously worked at SpringSource and have talked to the developers on
this topic. Here is my take. Prototype is great for testing things out, hence the name
prototype and not createnew or something more description of creating a new instance of
the bean each and every time you request it from the Spring container.
I have also found in my use over the years that I cannot thing of any other place where
prototype makes sense in any real world production application. If your object holds state,
it typically shouldn't be a Spring bean. I have found in all the applications I have worked
on that all beans are Services, Repositories, and Singleton non state holding objects
where I need to add features like Transactionality, JPA, JMS and the likes that give us the
enterprise features that POJOs don't have.
Bean Prototype Scopes Use Cases
Spring (previously known as SpringSource) was the company created by the founders of the Spring Framework (a programming model for enterprise
Java applications) to support and develop Spring and related projects.
Wiki. Spring company
https://en.wikipedia.org/wiki/Spring_(company)
신뢰가득!!

9. As someone who previously worked at SpringSource and have talked to the developers on
this topic. Here is my take. Prototype is great for testing things out, hence the name
prototype and not createnew or something more description of creating a new instance of
the bean each and every time you request it from the Spring container.
I have also found in my use over the years that I cannot thing of any other place where
prototype makes sense in any real world production application. If your object holds state,
it typically shouldn't be a Spring bean. I have found in all the applications I have worked
on that all beans are Services, Repositories, and Singleton non state holding objects
where I need to add features like Transactionality, JPA, JMS and the likes that give us the
enterprise features that POJOs don't have.
Bean Prototype Scopes Use Cases
Stackoverflow Spring prototype scope - Use Cases?
https://stackoverflow.com/questions/9664810/spring-prototype-scope-use-cases

10. 1.
Bean Prototype Scopes

11. 1.
Bean Prototype Scopes
.
, .

12. Bean Prototype Scopes
2.
.
( ) .

13. Bean Prototype Scopes
2.
.
( ) .
Stateful Pollution
All stateless Bean will be polluted when they are injected by the prototype bean.

14. Bean Prototype Scopes
2.
.
( ) .
Stateful Pollution
All stateless Bean will be polluted when they are injected by the prototype bean.
싱글톤 빈

15. Bean Prototype Scopes
2.
.
( ) .
Stateful Pollution
All stateless Bean will be polluted when they are injected by the prototype bean.
Stateless가 깨질 수 있는 위험

16. Bean Prototype Scopes
2.
.
( ) .
Stateful Pollution
All stateless Bean will be polluted when they are injected by the prototype bean.
Stateless가 깨질 수 있는 위험
Stateful은 우리에게 맞겨!

17. POP Quiz Q1. create IoC ?
Q3. (A) State ?
(A)
Q2. create ?
Q2 Stateful Poision
?

18. Bean Prototype Scopes
Stateful !( )
golang websocket -
https://www.slideshare.net/SangikBae/golang-websocket-109095156

19. http://post.procademy.co.kr/archives/752
Q. MMORPG Stateful Server ?
, CS(Client/Server) Stateful

20. Q. MMORPG ?
RPC
[ : ] Vol. 2 ( )
https://www.slideshare.net/sublee/lt-vol-2
RPC통신이 아닌 콜로세움이라는 자체 방식 도입

21. Q. Scale-out ?
3, (11 5 ?)
https://m.blog.naver.com/PostView.naver?isHttpsRedirect=true&blogId=isdn2721&logNo=221194505924

22. Porxy - Cartoon
https://javatutorial.net/java-proxy-design-pattern-example

23. Porxy - Cartoon
https://javatutorial.net/java-proxy-design-pattern-example
CGLib
Bean
User
https://better-dev.netlify.app/java/2020/09/05/thejava_15/
Dynamic Proxy

24. Porxy - Network
https://travelc.tistory.com/74

25. Porxy ‒ Spring Security
https://bezkoder.com/spring-boot-jwt-mysql-spring-security-architecture/

26. Porxy ‒Design Pattern
https://javatutorial.net/java-proxy-design-pattern-example

27. Porxy
https://javatutorial.net/java-proxy-design-pattern-example

28. Porxy
https://javatutorial.net/java-proxy-design-pattern-example
Loading test_10mb.jpg
Displaying test_10mb.jpg
Displaying test_10mb.jpg

29. Porxy Summary
1. Proxy는 실제 실제 Target의 기능을 대신 수행하면서, 기능을 확장하거나 추가하는 실제 객체
2. OCP(Open-Closed Principle)원칙을 지키기 위함

30. IoC Container, Porxy
IoC Container
Bean CRUD Request

31. IoC Container, Porxy
IoC Container
Bean CRUD Request
???
누구시죠?

32. IoC Container, Porxy
Bean CRUD Request
???
Bean Y
Bean N
IoC Container

33. IoC Container, Porxy
Bean CRUD Request
???
Bean Y
Bean N
IoC Container
JDK Dynamic Proxy
CGLib

34. IoC Container, Porxy
Bean CRUD Request
???
Bean Y
Bean N
IoC Container
JDK Dynamic Proxy
CGLib

35. IoC Container, Porxy
Bean CRUD Request
???
Bean Y
Bean N
IoC Container
JDK Dynamic Proxy
CGLib
Why?

36. IoC Container, Porxy
Bean CRUD Request
???
Bean Y
Bean N
IoC Container
JDK Dynamic Proxy
CGLib
Why? AOP,

37. https://engineering.linecorp.com/ko/blog/server-side-kotlin-clova-skill-challenge/

38. https://engineering.linecorp.com/ko/blog/server-side-kotlin-clova-skill-challenge/

39. - https://stackoverflow.com/questions/10570821/what-is-the-prototype-spring-bean-used-for
- https://www.baeldung.com/spring-bean-scopes
- https://stackoverflow.com/questions/21969044/when-to-use-spring-prototype-scope
- https://stackoverflow.com/questions/9664810/spring-prototype-scope-use-cases
- https://gmoon92.github.io/spring/aop/2019/04/20/jdk-dynamic-proxy-and-cglib.html
- https://huisam.tistory.com/entry/springAOP
- https://javacan.tistory.com/entry/114
- https://m.blog.naver.com/cncn6666/221784973026
- https://huisam.tistory.com/entry/springAOP

40. Week4. 2 END.