IoC

IoC๋Š” Inversion of Control์˜ ์•ฝ์ž๋กœ ์ œ์–ด์˜ ์—ญ์ „์ด๋ผ๋Š” ์˜๋ฏธ์ด๋‹ค. ์ œ์–ด์˜ ์—ญ์ „์ด๋ž€ ํ”„๋กœ๊ทธ๋žจ์˜ ์ œ์–ด ํ๋ฆ„ ๊ตฌ์กฐ๊ฐ€ ๋’ค๋ฐ”๋€Œ๋Š” ๊ฒƒ์ด๋ผ ์„ค๋ช…ํ•  ์ˆ˜ ์žˆ๋‹ค. IoC์—์„œ๋Š” ์˜ค๋ธŒ์ ํŠธ๊ฐ€ ์ž์‹ ์ด ์‚ฌ์šฉํ•  ์˜ค๋ธŒ์ ํŠธ๋ฅผ ์Šค์Šค๋กœ ์„ ํƒํ•˜๊ฑฐ๋‚˜ ์ƒ์„ฑํ•˜์ง€ ์•Š๋Š”๋‹ค. ๋˜ํ•œ, ์ž์‹ ๋„ ์–ด๋–ป๊ฒŒ ๋งŒ๋“ค์–ด์ง€๊ณ  ์–ด๋””์„œ ์‚ฌ์šฉ๋˜๋Š”์ง€๋ฅผ ์•Œ ์ˆ˜ ์—†๋‹ค. ๋ชจ๋“  ์ œ์–ด ๊ถŒํ•œ์„ ์ž์‹ ์ด ์•„๋‹Œ ๋‹ค๋ฅธ ๋Œ€์ƒ์—๊ฒŒ ์œ„์ž„ํ•˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค.

์„œ๋ธ”๋ฆฟ๋„ ์ œ์–ด์˜ ์—ญ์ „ ๊ฐœ๋…์ด ์ ์šฉ๋˜์–ด์žˆ๋‹ค๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค. ์ผ๋ฐ˜์ ์œผ๋กœ๋Š” main() ๋ฉ”์†Œ๋“œ์—์„œ ์‹œ์ž‘ํ•ด ๊ฐœ๋ฐœ์ž๊ฐ€ ๋ฏธ๋ฆฌ ์ •ํ•œ ์ˆœ์„œ๋ฅผ ๋”ฐ๋ผ ์˜ค๋ธŒ์ ํŠธ๊ฐ€ ์ƒ์„ฑ๋˜๊ณ  ์‹คํ–‰๋œ๋‹ค. ํ•˜์ง€๋งŒ ์„œ๋ธ”๋ฆฟ์€ ์‹คํ–‰์„ ๊ฐœ๋ฐœ์ž๊ฐ€ ์ง์ ‘ ์ œ์–ดํ•  ์ˆ˜ ์žˆ๋Š” ๋ฐฉ๋ฒ•์€ ์—†๋‹ค. ๋Œ€์‹  ์„œ๋ธ”๋ฆฟ์— ๋Œ€ํ•œ ์ œ์–ด ๊ถŒํ•œ์„ ๊ฐ€์ง„ ์ปจํ…Œ์ด๋„ˆ๊ฐ€ ์ ์ ˆํ•œ ์‹œ์ ์— ์„œ๋ธ”๋ฆฟ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋งŒ๋“ค๊ณ  ๊ทธ ์•ˆ์˜ ๋ฉ”์†Œ๋“œ๋ฅผ ํ˜ธ์ถœํ•œ๋‹ค.

ํ”„๋ ˆ์ž„์›Œํฌ๋„ ์ œ์–ด์˜ ์—ญ์ „ ๊ฐœ๋…์ด ์ ์šฉ๋œ ๋Œ€ํ‘œ ๊ธฐ์ˆ ์ด๋‹ค. ํ”„๋ ˆ์ž„์›Œํฌ๋Š” ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ฝ”๋“œ๊ฐ€ ํ”„๋ ˆ์ž„์›Œํฌ์— ์˜ํ•ด ์‚ฌ์šฉ๋œ๋‹ค. ํ”„๋ ˆ์ž„์›Œํฌ๊ฐ€ ํ๋ฆ„์„ ์ฃผ๋„ํ•˜๋Š” ์ค‘์— ๊ฐœ๋ฐœ์ž๊ฐ€ ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ฝ”๋“œ๋ฅผ ์‚ฌ์šฉํ•˜๋„๋ก ๋งŒ๋“  ๊ตฌ์กฐ์ด๋‹ค.

ํ”„๋ ˆ์ž„์›Œํฌ vs ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ

  • ํ”„๋ ˆ์ž„์›Œํฌ๊ฐ€ ๋‚ด๊ฐ€ ์ž‘์„ฑํ•œ ์ฝ”๋“œ๋ฅผ ์ œ์–ดํ•˜๊ณ , ์‹คํ–‰์„ํ•˜๋ฉด ๊ทธ๊ฒƒ์€ ํ”„๋ ˆ์ž„์›Œํฌ์ด๋‹ค.(ex. Junit)

  • ๋‚ด๊ฐ€ ์ž‘์„ฑํ•œ ์ฝ”๋“œ๊ฐ€ ์ง์ ‘ ์ œ์–ด์˜ ํ๋ฆ„์„ ๋‹ด๋‹นํ•œ๋‹ค๋ฉด ๊ทธ๊ฒƒ์€ ํ”„๋ ˆ์ž„์›Œํฌ๊ฐ€ ์•„๋‹ˆ๋ผ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ๋‹ค. (ex. Java to Xml)

Spring์˜ IoC ์šฉ์–ด

https://gmlwjd9405.github.io/images/spring-framework/spring-bean.png
  • bean : ์Šคํ”„๋ง์ด IoC ๋ฐฉ์‹์œผ๋กœ ๊ด€๋ฆฌํ•˜๋Š” ์˜ค๋ธŒ์ ํŠธ or ๊ด€๋ฆฌ๋˜๋Š” ์˜ค๋ธŒ์ ํŠธ์ด๋‹ค.

    ( ์Šคํ”„๋ง์ด ์ง์ ‘ ๊ทธ ์ƒ์„ฑ๊ณผ ์ œ์–ด๋ฅผ ๋‹ด๋‹นํ•˜๋Š” ์˜ค๋ธŒ์ ํŠธ๋งŒ์„ ๋นˆ์ด๋ผ๊ณ  ๋ถ€๋ฅธ๋‹ค. )

  • bean factory : ์Šคํ”„๋ง์˜ IoC๋ฅผ ๋‹ด๋‹นํ•˜๋Š” ํ•ต์‹ฌ ์ปจํ…Œ์ด๋„ˆ๋กœ ๋นˆ์„ ๋“ฑ๋ก, ์ƒ์„ฑ, ์กฐํšŒ, ๋ฐ˜ํ™˜๊ณผ ๊ฐ™์€ ๊ธฐ๋Šฅ์„ ๋‹ด๋‹นํ•œ๋‹ค. ๋ณดํ†ต ๋นˆ ํŒฉํ† ๋ฆฌ๋ฅผ ํ™•์žฅํ•œ Application Context๋ฅผ ์‚ฌ์šฉํ•œ๋‹ค.

  • application context : bean factory๋ฅผ ํ™•์žฅํ•œ IoC ์ปจํ…Œ์ด๋„ˆ๋‹ค. bean factory์— ์ถ”๊ฐ€๋กœ ์Šคํ”„๋ง์ด ์ œ๊ณตํ•˜๋Š” ๊ฐ์ข… ๋ถ€๊ฐ€ ์„œ๋น„์Šค๋ฅผ ์ถ”๊ฐ€ํ•œ๋‹ค. ์ฆ‰, ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ง€์› ๊ธฐ๋Šฅ์„ ๋ชจ๋‘ ํฌํ•จํ•ด์„œ ์ด์•ผ๊ธฐํ•˜๋Š” ๊ฒƒ์ด๋ผ๊ณ  ๋ณด๋ฉด๋œ๋‹ค.

  • Configuration metadata(์„ค์ •/์„ค์ • ๋ฉ”ํƒ€ ์ •๋ณด) : application context ๋˜๋Š” bean factory๊ฐ€ IoC๋ฅผ ์ ์šฉํ•˜๊ธฐ ์œ„ํ•ด ์‚ฌ์šฉํ•˜๋Š” ๋ฉ”ํƒ€์ •๋ณด๋ฅผ ๋งํ•œ๋‹ค. ๋ณดํ†ต IoC ์ปจํ…Œ์ด๋„ˆ์— ์˜ํ•ด ๊ด€๋ฆฌ๋˜๋Š” ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ์ƒ์„ฑํ•˜๊ณ  ๊ตฌ์„ฑํ•  ๋•Œ ์‚ฌ์šฉ

    • @Configuration ์–ด๋…ธํ…Œ์ด์…˜์œผ๋กœ ์„ค์ •

  • IoC container(DI container) : IoC๋ฐฉ์‹์œผ๋กœ ๋นˆ์„ ๊ด€๋ฆฌํ•œ๋‹ค๋Š” ๋œป์—์„œ application context๋‚˜ bean factory๋ฅผ ๊ทธ๋ ‡๊ฒŒ ๋ถ€๋ฅธ๋‹ค. IoC container๋Š” ๋นˆ ํŒฉํ† ๋ฆฌ ๊ด€์ ์—์„œ ์ด์•ผ๊ธฐ ํ•˜๋Š” ๊ฒƒ์ด๋ฉฐ, ๊ทธ๋ƒฅ ์ปจํ…Œ์ด๋„ˆ ํ˜น์€ ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๋ผ๊ณ  ํ• ๋•Œ๋Š” application context๋ฅผ ๊ฐ€๋ฆฌํ‚ค๋Š” ๊ฒƒ์ด๋ผ๊ณ  ๋ณด๋ฉด๋œ๋‹ค.

  • spring framework : IoC container, application context๋ฅผ ํฌํ•จํ•ด์„œ ์Šคํ”„๋ง์ด ์ œ๊ณตํ•˜๋Š” ๋ชจ๋“  ๊ธฐ๋Šฅ์„ ํ†ตํ‹€์–ด ๋งํ• ๋•Œ ์ฃผ๋กœ ์‚ฌ์šฉ

Factory๋Š” ๊ฐ์ฒด์˜ ์ƒ์„ฑ ๋ฐฉ๋ฒ•์„ ๊ฒฐ์ •ํ•˜๊ณ  ๊ทธ๋ ‡๊ฒŒ ๋งŒ๋“ค์–ด์ง„ Object๋ฅผ ๋Œ๋ ค์ฃผ๋Š” ์—ญํ• ์„ ํ•˜๋Š” ํด๋ž˜์Šค์ด๋‹ค. Factory๋Š” ๋‹จ์ง€ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ์ƒ์„ฑํ•˜๋Š” ์ชฝ๊ณผ ์ƒ์„ฑ๋œ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ์ชฝ์˜ ์—ญํ• ๊ณผ ์ฑ…์ž„์„ ๊น”๋”ํ•˜๊ฒŒ ๋ถ„๋ฆฌํ•˜๋ ค๋Š” ๋ชฉ์ ์œผ๋กœ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

package springbook.user.dao;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DaoFactory {
    @Bean
    public UserDao userDao() {
        UserDao dao = new UserDao(connectionMaker());
        return dao;
    }

    @Bean
    public ConnectionMaker connectionMaker() {
        ConnectionMaker connectionMaker = new DConnectionMaker();
        return connectionMaker;
    }
}
  • @Configuration : applicatoin context ๋˜๋Š” bean factory๊ฐ€ ์‚ฌ์šฉํ•  ์„ค์ •์ •๋ณด๋ผ๋Š” ์–ด๋…ธํ…Œ์ด์…˜

  • @Bean : ์˜ค๋ธŒ์ ํŠธ ์ƒ์„ฑ์„ ๋‹ด๋‹นํ•˜๋Š” IoC์šฉ ๋ฉ”์†Œ๋“œ๋ผ๋Š” ํ‘œ์‹œ

import java.sql.SQLException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.ApplicationContext;
import springbook.user.domain.User;

public class UserDaoTest {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {

        // applicationContext๋Š” ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ์ด๋ฉฐ, ์ธํ„ฐํŽ˜์ด์Šค๋‹ค.(๋‹คํ˜•์„ฑ)
    // AnnotationConfigApplicationContext์€ ๊ตฌํ˜„
        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(DaoFactory.class);
        UserDao dao = context.getBean("userDao", UserDao.class);

        User user = new User();
        user.setId("testId");
        user.setName("testName");
        user.setPassword("testtest");

        dao.add(user);            
    }
}

AnnotationConfigApplicationContext ๋Š” @Configuration(์–ด๋…ธํ…Œ์ด์…˜ ๊ธฐ๋ฐ˜) ์ด ๋ถ™์€ ์ž๋ฐ” ์ฝ”๋“œ๋ฅผ ์„ค์ •์ •๋ณด๋กœ ์‚ฌ์šฉํ• ๋•Œ ์‚ฌ์šฉํ•˜๋ฉด๋œ๋‹ค.

https://1.bp.blogspot.com/-FSsdFI2J_qU/T0W9oAqwLpI/AAAAAAAAADA/2JUZYu3WFOo/s1600/ApplicationContext.jpg

ApplicationContext๋Š” DaoFactory ํด๋ž˜์Šค๋ฅผ ์„ค์ •์ •๋ณด๋กœ ๋“ฑ๋กํ•ด๋‘๊ณ  @Bean์ด ๋ถ™์€ ๋ฉ”์†Œ๋“œ ์ด๋ฆ„์„ ๊ฐ€์ ธ์™€ ๋นˆ ๋ชฉ๋ก์„ ๋งŒ๋“ค์–ด ๋‘”๋‹ค.

ํด๋ผ์ด์–ธํŠธ๊ฐ€ ApplicationContext๋ฅผ getBean()๋ฉ”์†Œ๋“œ๋ฅผ ํ˜ธ์ถœํ•˜๋ฉด ์ž์‹ ์˜ ๋นˆ ๋ชฉ๋ก์—์„œ ์š”์ฒญํ•œ ์ด๋ฆ„์ด ์žˆ๋‹ค๋ฉด ๋นˆ์„ ์ƒ์„ฑํ•˜๋Š” ๋ฉ”์†Œ๋“œ๋ฅผ ํ˜ธ์ถœํ•ด ์˜ค๋ธŒ์ ํŠธ๋ฅผ ์ƒ์„ฑํ•œ ํ›„ ๋ฐ˜ํ™˜ํ•œ๋‹ค.

ApplicationContext๋Š” ๋˜ํ•œ ์‹ฑ๊ธ€ํ†ค์„ ์ €์žฅํ•˜๊ณ  ๊ด€๋ฆฌํ•˜๋Š” Singleton Registry์ด๊ธฐ๋„ ํ•˜๋‹ค. ์Šคํ”„๋ง์€ ๊ธฐ๋ณธ์ ์œผ๋กœ ๋ณ„๋‹ค๋ฅธ ์„ค์ •์„ ํ•˜์ง€ ์•Š์œผ๋ฉด ๋‚ด๋ถ€์—์„œ ์ƒ์„ฑํ•˜๋Š” ๋นˆ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋ชจ๋‘ ์‹ฑ๊ธ€ํ†ค์œผ๋กœ ๋งŒ๋“ ๋‹ค.

์Šคํ”„๋ง์€ ์„œ๋ฒ„ ํ™˜๊ฒฝ์—์„œ ์‹ฑ๊ธ€ํ†ค์ด ๋งŒ๋“ค์–ด์ ธ ์„œ๋น„์Šค ์˜ค๋ธŒ์ ํŠธ ๋ฐฉ์‹์œผ๋กœ ์‚ฌ์šฉ๋˜๋Š” ๊ฒƒ์€ ์ ๊ทน ์ง€์ง€ํ•œ๋‹ค. ํ•˜์ง€๋งŒ ์ž๋ฐ”์˜ ๊ธฐ๋ณธ์ ์ธ ์‹ฑ๊ธ€ํ†ค ํŒจํ„ด์˜ ๊ตฌํ˜„ ๋ฐฉ์‹์€ ์—ฌ๋Ÿฌ๊ฐ€์ง€ ๋‹จ์ ์ด ์žˆ๊ธฐ๋•Œ๋ฌธ์— ์Šคํ”„๋ง์€ ์ง์ ‘ ์‹ฑ๊ธ€ํ†ค ํ˜•ํƒœ์˜ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋งŒ๋“ค๊ณ  ๊ด€๋ฆฌํ•˜๋Š” ๊ธฐ๋Šฅ์„ ์ œ๊ณตํ•œ๋‹ค.

Singleton Registry์˜ ์žฅ์ ์€ ํ‰๋ฒ”ํ•œ ์ž๋ฐ” ํด๋ž˜์Šค์ด๋”๋ผ๋„ IoC๋ฐฉ์‹์˜ ์ปจํ…Œ์ด๋„ˆ๋ฅผ ์‚ฌ์šฉํ•ด ์ƒ์„ฑ๊ณผ ๊ด€๊ณ„์„ค์ •, ์‚ฌ์šฉ ๋“ฑ์— ๋Œ€ํ•œ ์ œ์–ด๊ถŒ์„ ์†์‰ฝ๊ฒŒ ์‹ฑ๊ธ€ํ†ค ๋ฐฉ์‹์œผ๋กœ ๋งŒ๋“ค์–ด์ ธ ๊ด€๋ฆฌ๋˜๊ฒŒ ํ•  ์ˆ˜ ์žˆ๋‹ค. ๊ทธ๋ ‡๊ธฐ ๋•Œ๋ฌธ์— ํ…Œ์ŠคํŠธ ํ™˜๊ฒฝ์—์„œ๋„ ์ž์œ ๋กญ๊ฒŒ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ๊ณ , ํ…Œ์ŠคํŠธ๋ฅผ ์œ„ํ•œ ๋ชฉ์ ์œผ๋กœ ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋Œ€์ฒดํ•˜๋Š” ๊ฒƒ๋„ ๊ฐ„๋‹จํ•˜๋‹ค.

์‹ฑ๊ธ€ํ†ค์ด ๋ฉ€ํ‹ฐ์Šค๋ ˆ๋“œ ํ™˜๊ฒฝ์—์„œ ์„œ๋น„์Šค ํ˜•ํƒœ์˜ ์˜ค๋ธŒ์ ํŠธ๋กœ ์‚ฌ์šฉ๋˜๋Š” ๊ฒฝ์šฐ์—๋Š” stateless ๋ฐฉ์‹์œผ๋กœ ๋งŒ๋“ค์–ด์ ธ์•ผํ•œ๋‹ค. ์ด๋•Œ๋Š” ์ฝ๊ธฐ์ „์šฉ ๊ฐ’์ด๋ผ๋ฉด ์ดˆ๊ธฐํ™” ์‹œ์ ์— ์ธ์Šคํ„ด์Šค ๋ณ€์ˆ˜์— ์ €์žฅํ•ด๋‘๊ณ  ๊ณต์œ ํ•˜๋Š” ๊ฒƒ์€ ๋ฌธ์ œ ์—†๋‹ค. ๋งŒ์•ฝ ๊ฐ ์š”์ฒญ์— ๋Œ€ํ•œ ์ •๋ณด๋‚˜, DB ์„œ๋ฒ„์˜ ๋ฆฌ์†Œ์Šค๋กœ ๋ถ€ํ„ฐ ์ƒ์„ฑํ•œ ์ •๋ณด๋Š” ํŒŒ๋ผ๋ฏธํ„ฐ์™€ ๋กœ์ปฌ ๋ณ€์ˆ˜, ๋ฆฌํ„ด ๊ฐ’์„ ์ด์šฉํ•˜๋ฉด ๋œ๋‹ค. ๋ฉ”์†Œ๋“œ ํŒŒ๋ผ๋ฏธํ„ฐ๋‚˜, ๋ฉ”์†Œ๋“œ ์•ˆ์—์„œ ์ƒ์„ฑ๋˜๋Š” ๋กœ์ปฌ ๋ณ€์ˆ˜๋Š” ๋งค๋ฒˆ ์ƒˆ๋กœ์šด ๊ฐ’์„ ์ €์žฅํ•  ๋…๋ฆฝ์ ์ธ ๊ณต๊ฐ„์ด ๋งŒ๋“ค์–ด์ง€๊ธฐ ๋•Œ๋ฌธ์— ์‹ฑ๊ธ€ํ†ค์ด๋ผ๊ณ  ํ•ด๋„ ๋ฌธ์ œ์—†๋‹ค.

๋“ฑ๋ก๋œ ๋นˆ ํ™•์ธํ•˜๊ธฐ

์‹ค์ œ๋กœ ๊ฐœ๋ฐœ์‹œ ์•„๋ž˜ ํ…Œ์ŠคํŠธ ์ฝ”๋“œ๋Š” ์‚ฌ์šฉํ•  ์ƒํ™ฉ์€ ๊ฑฐ์˜ ์—†์œผ๋‚˜ ์•„๋ž˜ ๋‘๊ฐ€์ง€ ๊ฒฝ์šฐ์— ๋Œ€๋น„ํ•ด ์•Œ์•„๋‘๋Š” ๊ฒƒ์ด ์ข‹๋‹ค.

  • ์ˆœ์ˆ˜ํ•œ ์ž๋ฐ” ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜์—์„œ ์Šคํ”„๋ง ์ปจํ…์ŠคํŠธ๋ฅผ ์ƒ์„ฑํ•˜์—ฌ ์‚ฌ์šฉํ•ด์•ผํ•˜๋Š” ๊ฒฝ์šฐ

  • ์ž๋™ ์˜์กด ๊ด€๊ณ„ ์ฃผ์ž…์‹œ ์ดํ•ด๋ฅผ ์œ„ํ•ด

๋ชจ๋“  ๋นˆ ๊ฐ€์ ธ์˜ค๊ธฐ

package dh0023.springcore.beanfind;

import dh0023.springcore.config.AppConfig;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

class ApplicationContextInfoTest {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);


    @Test
    @DisplayName("๋ชจ๋“  ๋นˆ ์ถœ๋ ฅํ•˜๊ธฐ")
    void findAllBean() {

        String[] beanDefinitionNames = ac.getBeanDefinitionNames();

        for(String beanDefinitionName : beanDefinitionNames){
            Object bean = ac.getBean(beanDefinitionName);
            System.out.println("name = " + beanDefinitionName + "object = " + bean);
        }
    }

    @Test
    @DisplayName("์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ๋นˆ ์ถœ๋ ฅํ•˜๊ธฐ")
    void findApplicationBean() {

        String[] beanDefinitionNames = ac.getBeanDefinitionNames();

        for(String beanDefinitionName : beanDefinitionNames){
            BeanDefinition beanDefinition = ac.getBeanDefinition(beanDefinitionName);

            // BeanDefinition.ROLE_APPLICATION : ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜์„ ๊ฐœ๋ฐœํ•˜๊ธฐ์œ„ํ•ด ์ง์ ‘ ๋“ฑ๋กํ•œ ๋นˆ๋“ค(or ์™ธ๋ถ€ ๋ผ์ด๋ธŒ๋Ÿด)
            // BeanDefinition.ROLE_INFRASTRUCTURE : ์Šคํ”„๋ง ๋‚ด๋ถ€์—์„œ ์‚ฌ์šฉํ•˜๋Š” ๋นˆ
            if (beanDefinition.getRole() == BeanDefinition.ROLE_APPLICATION) {
                Object bean = ac.getBean(beanDefinitionName);
                System.out.println("name = " + beanDefinitionName + " object = " + bean);
            }

        }
    }
}

๋นˆ ์ด๋ฆ„ / ๋นˆ ํƒ€์ž…์œผ๋กœ ์กฐํšŒ

package dh0023.springcore.beanfind;

import dh0023.springcore.config.AppConfig;
import dh0023.springcore.member.service.MemberService;
import dh0023.springcore.member.service.MemberServiceImpl;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import static org.assertj.core.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.*;

public class ApplicationContextBasicFindTest {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

    @Test
    @DisplayName("๋นˆ ์ด๋ฆ„์œผ๋กœ ์กฐํšŒ")
    void findBeanByName() {
        MemberService memberService = ac.getBean("memberService", MemberService.class);
        assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }


    @Test
    @DisplayName("์ด๋ฆ„์—†์ด ํƒ€์ž…์œผ๋กœ๋งŒ ์กฐํšŒ")
    void findBeanByType() {
        // ํƒ€์ž…์œผ๋กœ๋งŒ ์กฐํšŒํ•˜๋ฉด, ํƒ€์ž…์ด ๊ฒน์น˜๋Š” ๊ฒฝ์šฐ์— ๋ฌธ์ œ๊ฐ€ ์žˆ๋‹ค.
        MemberService memberService = ac.getBean(MemberService.class);
        assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }

    @Test
    @DisplayName("๊ตฌ์ฒด ํƒ€์ž…์œผ๋กœ ์กฐํšŒ")
    void findBeanByName2() {

        // ์—ญํ• ๊ณผ ๊ตฌํ˜„์„ ๊ตฌ๋ถ„ํ•˜๊ณ , ์—ญํ• ์— ์˜์กดํ•ด์•ผํ•œ๋‹ค.
        // ํ•˜์ง€๋งŒ ๊ตฌ์ฒด ํƒ€์ž…์œผ๋กœ ์กฐํšŒํ•˜๋Š”๊ฑด ๊ตฌํ˜„์— ์˜์กดํ•˜๋Š” ๊ฒƒ์ด๋ฏ€๋กœ ์ข‹์€ ๋ฐฉ์‹์€ ์•„๋‹ˆ๋‹ค.
        MemberService memberService = ac.getBean("memberService", MemberServiceImpl.class);
        assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }

    @Test
    @DisplayName("๋นˆ ์ด๋ฆ„์œผ๋กœ ์กฐํšŒX")
    void findBeanByNameX() {

//      ac.getBean("xxxxx", MemberService.class);

        // org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'xxxxx' available
        // lambda ์‹คํ–‰ํžˆ ์™ผ์ชฝ Exception์ด ์ˆ˜ํ–‰๋˜์–ด์•ผํ•œ๋‹ค.
        assertThrows(NoSuchBeanDefinitionException.class, () -> ac.getBean("xxxxx", MemberService.class));

    }
}

๊ฐ™์€ ํƒ€์ž…์ด ๋‘˜ ์ด์ƒ์ธ ๊ฒฝ์šฐ ์กฐํšŒ

package dh0023.springcore.beanfind;

import dh0023.springcore.member.repository.MemberRepository;
import dh0023.springcore.member.repository.MemoryMemberRepository;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Map;

import static org.assertj.core.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.*;

public class ApplicationContextSameBeanFindTest {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(SameBeanConfig.class);

    @Test
    @DisplayName("ํƒ€์ž…์œผ๋กœ ์กฐํšŒ์‹œ ๊ฐ™์€ ํƒ€์ž…์ด ๋‘˜ ์ด์ƒ ์žˆ์œผ๋ฉด, ์ค‘๋ณต ์˜ค๋ฅ˜ ๋ฐœ์ƒ")
    void findBeanByTypeDuplicate() {
        // org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'dh0023.springcore.member.repository.MemberRepository' available: expected single matching bean but found 2: memberRepository,memberRepository2
        assertThrows(NoUniqueBeanDefinitionException.class, () -> ac.getBean(MemberRepository.class));
    }

    @Test
    @DisplayName("ํƒ€์ž…์œผ๋กœ ์กฐํšŒ์‹œ ๊ฐ™์€ ํƒ€์ž…์ด ๋‘˜ ์ด์ƒ ์žˆ์œผ๋ฉด, ๋นˆ ์ด๋ฆ„ ์ง€์ •ํ•˜์—ฌ ํ•ด๊ฒฐ")
    void findBeanByName() {
        MemberRepository memberRepository = ac.getBean("memberRepository", MemberRepository.class);
        assertThat(memberRepository).isInstanceOf(MemberRepository.class);
    }

    @Test
    @DisplayName("ํŠน์ • ํƒ€์ž…์˜ ๋นˆ ๋ชจ๋‘ ์กฐํšŒ")
    void findAllBeanByType() {
        Map<String, MemberRepository> beansOfType = ac.getBeansOfType(MemberRepository.class);

        for (String key : beansOfType.keySet()) {
            System.out.println("key = " + key + " value = " + beansOfType.get(key));
        }
        System.out.println("beansOfType = " + beansOfType);

        assertThat(beansOfType.size()).isEqualTo(2);

    }

    /**
     * ApplicationContextSameBeanFindTest์•ˆ์—์„œ๋งŒ ํ…Œ์ŠคํŠธ ์šฉ๋„๋กœ ์‚ฌ์šฉํ•  Class
     */
    @Configuration
    static class SameBeanConfig {

        @Bean
        public MemberRepository memberRepository() {
            return new MemoryMemberRepository();
        }

        @Bean
        public MemberRepository memberRepository2() {
            return new MemoryMemberRepository();
        }

    }
}

์ƒ์† ๊ด€๊ณ„

๋ถ€๋ชจ ํƒ€์ž…์œผ๋กœ ์Šคํ”„๋ง ๋นˆ ์กฐํšŒ์‹œ, ์ž์‹ ํƒ€์ž…๋„ ํ•จ๊ป˜ ์กฐํšŒํ•œ๋‹ค. ๊ทธ๋Ÿฌ๋ฏ€๋กœ ์ž๋ฐ” ๊ฐ์ฒด์˜ ์ดˆ์ƒ์œ„ ๊ฐ์ฒด์ธ Object ๋กœ ์กฐํšŒ์‹œ, ๋ชจ๋“  ์Šคํ”„๋ง ๋นˆ์„ ์กฐํšŒํ•œ๋‹ค.

package dh0023.springcore.beanfind;

import dh0023.springcore.discount.service.DiscountPolicy;
import dh0023.springcore.discount.service.FixDiscountPolicy;
import dh0023.springcore.discount.service.RateDiscountPolicy;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Map;

import static org.assertj.core.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.*;

public class ApplicationContextExtendsFindTest {
    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(TestConfig.class);

    @Test
    @DisplayName("๋ถ€๋ชจ ํƒ€์ž…์œผ๋กœ ์กฐํšŒ์‹œ, ์ž์‹์ด ๋‘˜ ์ด์ƒ ์žˆ์œผ๋ฉด, ์ค‘๋ณต ์˜ค๋ฅ˜ ๋ฐœ์ƒ")
    void findBeanByParentTypeDuplicate() {
        // org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'dh0023.springcore.discount.service.DiscountPolicy' available: expected single matching bean but found 2: rateDiscountPolicy,fixDiscountPolicy
//        DiscountPolicy discountPolicy = ac.getBean(DiscountPolicy.class);

        assertThrows(NoUniqueBeanDefinitionException.class, () -> ac.getBean(DiscountPolicy.class));
    }

    @Test
    @DisplayName("๋ถ€๋ชจ ํƒ€์ž…์œผ๋กœ ์กฐํšŒ์‹œ, ์ž์‹์ด ๋‘˜ ์ด์ƒ ์žˆ์œผ๋ฉด, ๋นˆ ์ด๋ฆ„์„ ์ง€์ •ํ•˜๋ฉด ๋œ๋‹ค.")
    void findBeanByParentTypeBeanName() {
        DiscountPolicy discountPolicy = ac.getBean("rateDiscountPolicy", DiscountPolicy.class);

        assertThat(discountPolicy).isInstanceOf(RateDiscountPolicy.class);
    }

    @Test
    @DisplayName("ํŠน์ • ํ•˜์œ„ ํƒ€์ž…์œผ๋กœ ์กฐํšŒ")
    void findBeanBySubType() {
        RateDiscountPolicy rateDiscountPolicy = ac.getBean(RateDiscountPolicy.class);
        assertThat(rateDiscountPolicy).isInstanceOf(RateDiscountPolicy.class);
    }


    @Test
    @DisplayName("๋ถ€๋ชจ ํƒ€์ž…์œผ๋กœ ์ „์ฒด ์กฐํšŒ")
    void findAllBeansByParentType() {
        Map<String, DiscountPolicy> beansOfType = ac.getBeansOfType(DiscountPolicy.class);
        assertThat(beansOfType.size()).isEqualTo(2);
    }

    @Test
    @DisplayName("๋ถ€๋ชจ ํƒ€์ž…์œผ๋กœ ์ „์ฒด ์กฐํšŒ - Object")
    void findAllBeansByObjectType() {
        Map<String, Object> beansOfType = ac.getBeansOfType(Object.class);
        for (String key : beansOfType.keySet()) {
            System.out.println("key = " + key + " object " + beansOfType.get(key));
        }
    }




    @Configuration
    static class TestConfig {

        /**
         * @return DiscountPolicy : ์—ญํ• ๊ณผ ๊ตฌํ˜„์„ ๊ตฌ๋ถ„ํ•˜๊ธฐ ์œ„ํ•ด์„œ
         */
        @Bean
        public DiscountPolicy rateDiscountPolicy() {
            return new RateDiscountPolicy();
        }

        @Bean
        public DiscountPolicy fixDiscountPolicy() {
            return new FixDiscountPolicy();
        }
    }
}

BeanFactory ์™€ ApplicationContext ๊ด€๊ณ„

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTSi_K0Shruo4lYUwJufHG9FgKIFxEIIustCQ&usqp=CAU
  • BeanFactory์™€ ApplicationContext๋ฅผ ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๋ผํ•œ๋‹ค.

  • BeanFactory๋ฅผ ์ง์ ‘ ์‚ฌ์šฉํ•  ์ผ์€ ๊ฑฐ์˜ ์—†์œผ๋ฉฐ, ๋ถ€๊ฐ€๊ธฐ๋Šฅ์ด ํฌํ•จ๋œ ApplicationContext๋ฅผ ์‚ฌ์šฉํ•œ๋‹ค.

BeanFactory

  • ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ์˜ ์ตœ์ƒ์œ„ ์ธํ„ฐํŽ˜์ด์Šค

  • ์Šคํ”„๋ง ๋นˆ์„ ๊ด€๋ฆฌํ•˜๊ณ  ์กฐํšŒํ•˜๋Š” ์—ญํ• ์„ ๋‹ด๋‹น

  • getBean() ์„ ์ œ๊ณต

ApplicationContext

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  • BeanFactory ๊ธฐ๋Šฅ์„ ๋ชจ๋‘ ์ƒ์†๋ฐ›์•„์„œ ์ œ๊ณต

  • ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜์„ ๊ฐœ๋ฐœํ•  ๋•Œ๋Š” ๋นˆ์€ ๊ด€๋ฆฌํ•˜๊ณ  ์กฐํšŒํ•˜๋Š” ๊ธฐ๋Šฅ์€ ๋ฌผ๋ก ์ด๊ณ , ์ˆ˜ ๋งŽ์€ ๋ถ€๊ฐ€๊ธฐ๋Šฅ์ด ํ•„์š”ํ•˜๋‹ค.

  • MessageSource : ๋ฉ”์„ธ์ง€ ์†Œ์Šค๋ฅผ ํ™œ์šฉํ•œ ๊ตญ์ œํ™” ๊ธฐ๋Šฅ

    • ํ•œ๊ตญ์—์„œ ์ ‘์†์‹œ ํ•œ๊ตญ์–ด๋กœ, ์˜์–ด๊ถŒ์—์„œ ๋“ค์–ด์˜ค๋ฉด ์˜์–ด๋กœ ์ถœ๋ ฅ

  • EnvironmentCapable : ํ™˜๊ฒฝ๋ณ€์ˆ˜

    • local, dev, qa, stg, prod ๋“ฑ์„ ๊ตฌ๋ถ„ํ•ด์„œ ์ฒ˜๋ฆฌ

  • ApplicationEventPublisher : ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ด๋ฒคํŠธ

    • ์ด๋ฒคํŠธ๋ฅผ ๋ฐœํ–‰ํ•˜๊ณ  ๊ตฌ๋…ํ•˜๋Š” ๋ชจ๋ธ์„ ํŽธ๋ฆฌํ•˜๊ฒŒ ์ง€์›

  • ResourceLoader : ํŽธ๋ฆฌํ•œ ๋ฆฌ์†Œ์Šค ์กฐํšŒ

    • ํŒŒ์ผ, ํด๋ž˜์ŠคํŒจ์Šค, ์™ธ๋ถ€ ๋“ฑ์—์„œ ๋ฆฌ์†Œ์Šค๋ฅผ ํŽธ๋ฆฌํ•˜๊ฒŒ ์กฐํšŒ

Bean Scope

์Šคํ”„๋ง์ด ๊ด€๋ฆฌํ•˜๋Š” ์˜ค๋ธŒ์ ํŠธ(=๋นˆ)์˜ Scope๋Š” ๊ธฐ๋ณธ์ ์œผ๋กœ ์‹ฑ๊ธ€ํ†ค์ด๋‹ค.

  • Singleton Scope : ์ปจํ…Œ์ด๋„ˆ ๋‚ด์— ํ•œ๊ฐœ์˜ ์˜ค๋ธŒ์ ํŠธ๋งŒ ๋งŒ๋“ค์–ด์ ธ ๊ฐ•์ œ๋กœ ์ œ๊ฑฐํ•˜์ง€ ์•Š๋Š” ํ•œ ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๊ฐ€ ์กด์žฌํ•˜๋Š” ๋™์•ˆ ๊ณ„์† ์œ ์ง€๋œ๋‹ค.

    • ์ƒํƒœ๊ฐ€ ์—†๋Š” ๊ณต์œ  ๊ฐ์ฒด : ๋งค๋ฒˆ ์ƒˆ๋กœ์šด ๊ฐ์ฒด๋ฅผ ์ƒ์„ฑํ•  ์ด์œ ๊ฐ€ ์—†๋‹ค.

    • ์ฝ๊ธฐ์šฉ์œผ๋กœ๋งŒ ์ƒํƒœ๋ฅผ ๊ฐ€์ง„ ๊ณต์œ  ๊ฐ์ฒด : ๋งค๋ฒˆ ์ƒˆ๋กœ์šด ๊ฐ์ฒด๋ฅผ ์ƒ์„ฑํ•  ์ด์œ ๊ฐ€ ์—†๋‹ค.

    • ๊ณต์œ ๊ฐ€ ํ•„์š”ํ•œ ์ƒํƒœ๋ฅผ ์ง€๋‹Œ ๊ณต์œ  ๊ฐ์ฒด : ๊ฐ์ฒด ๊ฐ„ ๋ฐ˜๋“œ์‹œ ๊ณต์œ ํ•ด์•ผํ•  ์ƒํƒœ๋ฅผ ์ง€๋‹Œ ๊ฐ์ฒด๊ฐ€ ์žˆ๋‹ค๋ฉด ์ด ๊ฒฝ์šฐ์—๋Š” Singleton์ ํ•ฉ

    • ์“ฐ๊ธฐ๊ฐ€ ๊ฐ€๋Šฅํ•˜๋ฉด์„œ๋„ ์‚ฌ์šฉ๋นˆ๋„๊ฐ€ ๋งค์šฐ ๋†’์€ ๊ฐ์ฒด

      • ์žฅ์‹œ๊ฐ„์— ๊ฑธ์ณ ๋งค์šฐ ๋งŽ์€ ๊ฐ์ฒด๊ฐ€ ์ƒ์„ฑ๋˜๋Š” ๊ฒฝ์šฐ

      • ํ•ด๋‹น ๊ฐ์ฒด๊ฐ€ ๋งค์šฐ ์ž‘์€ ์–‘์˜ ์“ฐ๊ธฐ ์ƒํƒœ๋ฅผ ๊ฐ€์ง„ ๊ฒฝ์šฐ

      • ๊ฐ์ฒด ์ƒ์„ฑ ๋น„์šฉ์ด ๋งค์šฐ ํฐ ๊ฒฝ์šฐ

  • Prototype Scope : ์ปจํ…Œ์ด๋„ˆ์— ๋นˆ์„ ์š”์ฒญํ•  ๋•Œ๋งˆ๋‹ค ๋งค๋ฒˆ ์ƒˆ๋กœ์šด ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋งŒ๋“ค์–ด์ค€๋‹ค.(gc์— ์˜ํ•ด์„œ bean์ด ์ œ๊ฑฐ๋œ๋‹ค)

  • Request Scope : HTTP ์š”์ฒญ์ด ์ƒ๊ธธ๋•Œ๋งˆ๋‹ค ์ƒ์„ฑ๋˜๋Š” ์š”์ฒญ ์Šค์ฝ”ํ”„

  • Session Scope : ์›น์˜ Session๊ณผ ์œ ์‚ฌํ•œ ์„ธ์…˜ ์Šค์ฝ”ํ”„

Dependency Injection

DI๋Š” ์˜์กด๊ด€๊ณ„ ์ฃผ์ž…์€ ๋ง ๊ทธ๋Œ€๋กœ ์˜์กด์ ์ธ ๊ฐ์ฒด๋ฅผ ์ง์ ‘ ์ƒ์„ฑํ•˜๊ฑฐ๋‚˜ ์ œ์–ดํ•˜๋Š” ๊ฒƒ์ด ์•„๋‹ˆ๋ผ, ํŠน์ • ๊ฐ์ฒด์— ํ•„์š”ํ•œ ๊ฐ์ฒด๋ฅผ ์™ธ๋ถ€์—์„œ ๊ฒฐ์ •ํ•ด์„œ ์—ฐ๊ฒฐ์‹œํ‚ค๋Š” ๊ฒƒ์„ ์˜๋ฏธํ•œ๋‹ค.

์ธํ„ฐํŽ˜์ด์Šค์— ๋Œ€ํ•ด์„œ๋งŒ ์˜์กด๊ด€๊ณ„๋ฅผ ๋งŒ๋“ค์–ด๋‘๋ฉด ์ธํ„ฐํŽ˜์ด์Šค ๊ตฌํ˜„ ํด๋ž˜์Šค์™€์˜ ๊ด€๊ณ„๋Š” ๋А์Šจํ•ด์ง€๋ฉด์„œ ๋ณ€ํ™”์— ์˜ํ–ฅ์„ ๋œ ๋ฐ›๋Š” ์ƒํƒœ(= ๊ฒฐํ•ฉ๋„๊ฐ€ ๋‚ฎ์€ ์ƒํƒœ)๊ฐ€ ๋œ๋‹ค. ์˜์กด๊ด€๊ณ„๋ž€ ํ•œ์ชฝ์˜ ๋ณ€ํ™”๊ฐ€ ๋‹ค๋ฅธ ์ชฝ์— ์˜ํ–ฅ์„ ์ฃผ๋Š” ๊ฒƒ์ธ๋ฐ, ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ํ†ตํ•ด ์˜์กด ๊ด€๊ณ„๋ฅผ ์ œ์•ˆํ•ด์ฃผ๋ฉด ๊ทธ๋งŒํผ ๋ณ€ํ™”๋กœ๋ถ€ํ„ฐ ์ž์œ ๋กœ์›Œ์งˆ ์ˆ˜ ์žˆ๋‹ค.

๋Ÿฐํƒ€์ž„ ์‹œ์— ์˜ค๋ธŒ์ ํŠธ ์‚ฌ์ด์—์„œ ๋งŒ๋“ค์–ด์ง€๋Š” ์˜์กด๊ด€๊ณ„๋„ ์žˆ๋‹ค. ๋Ÿฐํƒ€์ž„ ์˜์กด๊ด€๊ณ„ ํ˜น์€ ์˜ค๋ธŒ์ ํŠธ ์˜์กด ๊ด€๊ณ„์ธ๋ฐ, ์„ค๊ณ„ ์‹œ์ ์˜ ์˜์กด๊ด€๊ณ„๊ฐ€ ์‹ค์ฒดํ™”๋œ ๊ฒƒ์œผ๋กœ ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ํ†ตํ•ด ์„ค๊ณ„ ์‹œ์ ์— ๋А์Šจํ•œ ์˜์กด๊ด€๊ณ„๋ฅผ ๊ฐ–๋Š” ๊ฒฝ์šฐ์—๋Š” ๋Ÿฐํƒ€์ž„ ์‹œ์— ์‚ฌ์šฉํ•  ์˜ค๋ธŒ์ ํŠธ๊ฐ€ ์–ด๋–ค ํด๋ž˜์Šค๋กœ ๋งŒ๋“  ๊ฒƒ์ธ์ง€ ๋ฏธ๋ฆฌ ์•Œ ์ˆ˜ ์—†๋‹ค. ํ”„๋กœ๊ทธ๋žจ์ด ์‹œ์ž‘๋˜๊ณ  ์˜ค๋ธŒ์ ํŠธ๊ฐ€ ๋งŒ๋“ค์–ด์ง€๊ณ  ๋‚˜์„œ ๋Ÿฐํƒ€์ž„ ์‹œ์— ์˜์กด ๊ด€๊ณ„๋ฅผ ๋งบ๋Š” ๋Œ€์ƒ์„ ์˜์กด ์˜ค๋ธŒ์ ํŠธ(dependent object)๋ผ๊ณ  ํ•œ๋‹ค.

์ฆ‰, ์˜์กด ๊ด€๊ณ„ ์ฃผ์ž…์€ ์˜์กด ์˜ค๋ธŒ์ ํŠธ์™€ ๊ทธ๊ฒƒ์„ ์‚ฌ์šฉํ•  ์ฃผ์ฒด ์˜ค๋ธŒ์ ํŠธ๋ฅผ ๋Ÿฐํƒ€์ž„ ์‹œ์— ์—ฐ๊ฒฐํ•ด์ฃผ๋Š” ์ž‘์—…์„ ๋งํ•œ๋‹ค.

  1. ํด๋ž˜์Šค ๋ชจ๋ธ์ด๋‚˜ ์ฝ”๋“œ์—์„œ ๋Ÿฐํƒ€์ž„ ์‹œ์ ์˜ ์˜์กด ๊ด€๊ณ„๊ฐ€ ๋“œ๋Ÿฌ๋‚˜์ง€ ์•Š๋Š”๋‹ค. ๊ทธ๋Ÿฌ๊ธฐ ์œ„ํ•ด์„œ๋Š” ์ธํ„ฐํŽ˜์ด์Šค์—๋งŒ ์˜์กดํ•˜๊ณ  ์žˆ์–ด์•ผํ•œ๋‹ค.

  2. ๋Ÿฐํƒ€์ž„ ์‹œ์ ์˜ ์˜์กด๊ด€๊ณ„๋Š” ์ปจํ…Œ์ด๋„ˆ๋‚˜ ํŒฉํ† ๋ฆฌ ๊ฐ™์€ ์ œ 3์˜ ์กด์žฌ๊ฐ€ ๊ฒฐ์ •ํ•œ๋‹ค.

  3. ์˜์กด ๊ด€๊ณ„๋Š” ์‚ฌ์šฉํ•  ์˜ค๋ธŒ์ ํŠธ์— ๋Œ€ํ•œ ๋ ˆํผ๋Ÿฐ์Šค๋ฅผ ์™ธ๋ถ€์—์„œ ์ œ๊ณตํ•ด์คŒ์œผ๋กœ์จ ๋งŒ๋“ค์–ด์ง„๋‹ค.

์ฆ‰, ์˜์กด๊ด€๊ณ„ ์ฃผ์ž…์„ ์‚ฌ์šฉํ•˜๋ฉด ์ •์ ์ธ ํด๋ž˜์Šค ์˜์กด๊ด€๊ณ„๋ฅผ ๋ณ€๊ฒฝํ•˜์ง€ ์•Š๊ณ , ๋™์ ์ธ ๊ฐ์ฒด ์ธ์Šคํ„ด์Šค ์˜์กด๊ด€๊ณ„๋ฅผ ์‰ฝ๊ฒŒ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์žˆ๋‹ค.

์˜์กด๊ด€๊ณ„ ์ฃผ์ž…(DI)์˜ ํ•ต์‹ฌ์€ ์„ค๊ณ„ ์‹œ์ ์— ์•Œ์ง€ ๋ชปํ–ˆ๋˜ ๋‘ ์˜ค๋ธŒ์ ํŠธ์˜ ๊ด€๊ณ„๋ฅผ ๋งบ๋„๋ก ๋„์™€์ฃผ๋Š” ์ œ 3์˜ ์กด์žฌ๊ฐ€ ์žˆ๋‹ค๋Š” ๊ฒƒ์ด๋‹ค. ์—ฌ๊ธฐ์„œ ์ œ 3์˜ ์กด์žฌ๋Š” ๋ฐ”๋กœ ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ปจํ…์ŠคํŠธ, ๋นˆ ํŒฉํ† ๋ฆฌ, IoC ์ปจํ…Œ์ด๋„ˆ๋ผ๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

์Šคํ”„๋ง์˜ DI๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด "๊ธฐ์กด ์ฝ”๋“œ๋ฅผ ์ „ํ˜€ ์†๋Œ€์ง€ ์•Š๊ณ , ์„ค์ •๋งŒ์œผ๋กœ ๊ตฌํ˜„ ํด๋ž˜์Šค๋ฅผ ๋ณ€๊ฒฝ"ํ•  ์ˆ˜ ์žˆ๋‹ค.

์ •์  ํด๋ž˜์Šค ์˜์กด ๊ด€๊ณ„

ํด๋ž˜์Šค๊ฐ€ ์‚ฌ์šฉํ•˜๋Š” import ์ฝ”๋“œ๋งŒ ๋ณด๊ณ  ์˜์กด๊ด€๊ณ„๋ฅผ ์‰ฝ๊ฒŒ ํŒ๋‹จํ•  ์ˆ˜ ์žˆ๋‹ค. ์ •์ ์ธ ์˜์กด๊ด€๊ณ„๋Š” ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์„ ์‹คํ–‰ํ•˜์ง€ ์•Š์•„๋„ ๋ถ„์„ํ•  ์ˆ˜ ์žˆ๋‹ค. ํด๋ž˜์Šค ๋‹ค์ด์–ด๊ทธ๋žจ์„ ์ƒ๊ฐํ•˜๋ฉด ๋œ๋‹ค.

XML์„ ์ด์šฉํ•œ ์„ค์ •

์ตœ๊ทผ์—๋Š” ์Šคํ”„๋ง ๋ถ€ํŠธ๋ฅผ ๋งŽ์ด ์‚ฌ์šฉํ•˜๋ฉด์„œ XML๊ธฐ๋ฐ˜์˜ ์„ค์ •์€ ์ž˜ ์‚ฌ์šฉํ•˜์ง€ ์•Š๋Š”๋‹ค. ํ•˜์ง€๋งŒ, ์•„์ง ๋งŽ์€ ๋ ˆ๊ฑฐ์‹œ ํ”„๋กœ์ ํŠธ์—์„œ XML๋กœ ์„ค์ •๋˜์–ด์žˆ๋‹ค. XML ์‚ฌ์šฉ์‹œ ์ปดํŒŒ์ผ ์—†์ด ๋นˆ ์„ค์ • ์ •๋ณผ๋ฅด ๋ณ€๊ฒฝํ•  ์ˆ˜ ์žˆ์œผ๋ฏ€๋กœ ์•Œ์•„๋‘๋Š” ๊ฒƒ์ด ์ข‹๋‹ค.

XML์œผ๋กœ ์˜์กด๊ด€๊ณ„ ์„ค์ •์ •๋ณด๋ฅผ ๋งŒ๋“ค๋ฉด ๋‹ค์Œ๊ณผ ๊ฐ™์€ ์žฅ์ ์ด ์žˆ๋‹ค.

  1. ๋‹จ์ˆœํ•œ ํ…์ŠคํŠธ ํŒŒ์ผ์ด๊ธฐ๋•Œ๋ฌธ์— ๋‹ค๋ฃจ๊ธฐ ์‰ฌ์›€

  2. ์‰ฝ๊ฒŒ ์ดํ•ดํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ปดํŒŒ์ผ๊ณผ ๊ฐ™์€ ๋ณ„๋„์˜ ๋นŒ๋“œ ์ž‘์—…์ด ์—†์Œ

  3. ๋น ๋ฅด๊ฒŒ ๋ณ€๊ฒฝ์‚ฌํ•ญ์„ ๋ฐ˜์˜ํ•  ์ˆ˜ ์žˆ์Œ

  4. ์Šคํ‚ค๋งˆ๋‚˜ DTD๋ฅผ ์ด์šฉํ•ด ์ •ํ•ด์ง„ ํฌ๋งท์„ ๋”ฐ๋ผ ์ž‘์„ฑํ–ˆ๋Š”์ง€ ์‰ฝ๊ฒŒ ํ™•์ธ ๊ฐ€๋Šฅ

GenericXmlApplicationContext ๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด์„œ xml ์„ค์ • ํŒŒ์ผ์„ ๋„˜๊ธฐ๋ฉด ๋œ๋‹ค.

์Šคํ”„๋ง์˜ application context๋Š” XML์— ๋‹ด๊ธด DI์ •๋ณด๋ฅผ ํ™œ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค. ์•ž์„œ์„œ ๋‹ค๋ค˜๋˜ @Configuration ์„ <beans> , @bean ์„ <bean> ์œผ๋กœ ๋Œ€์‘ํ•ด์„œ ์ƒ๊ฐํ•˜๋ฉด ์ดํ•ดํ•˜๊ธฐ ์‰ฝ๋‹ค.

์ž๋ฐ” ์ฝ”๋“œ ์„ค์ •์ •๋ณด

XML

Bean ์„ค์ •ํŒŒ์ผ

@Configuration

\

Bean ์ด๋ฆ„

@Bean methodName()

\

Bean Class

return new BeanClass()

class="a.b.c...BeanClass" (package๊นŒ์ง€ ํฌํ•จํ•ด์•ผํ•œ๋‹ค.)

Bean Scope

@Scope()

scope = "singleton"

  • JAVA

package dh0023.springcore.config;

import dh0023.springcore.discount.service.DiscountPolicy;
import dh0023.springcore.discount.service.RateDiscountPolicy;
import dh0023.springcore.member.repository.MemberRepository;
import dh0023.springcore.member.repository.MemoryMemberRepository;
import dh0023.springcore.member.service.MemberService;
import dh0023.springcore.member.service.MemberServiceImpl;
import dh0023.springcore.order.service.OrderService;
import dh0023.springcore.order.service.OrderServiceImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * ์• ํ”Œ๋ฆฌ์ผ€์…˜์˜ ์‹ค์ œ ๋™์ž‘์— ํ•„์š”ํ•œ ๊ตฌํ˜„ ๊ฐ์ฒด ์ƒ์„ฑ
 * ์ƒ์„ฑํ•œ ๊ฐ์ฒด ์ธ์Šคํ„ด์Šค์˜ ์ฐธ์กฐ๋ฅผ ์ƒ์„ฑ์ž๋ฅผ ํ†ตํ•ด ์ฃผ์ž…ํ•ด์ค€๋‹ค.
 */
@Configuration
public class AppConfig {

    @Bean
    public MemberService memberService() {
        return new MemberServiceImpl(getMemberRepository());
    }

    @Bean
    public MemberRepository getMemberRepository() {
        return new MemoryMemberRepository();
    }

    @Bean
    public OrderService orderService(){
        return new OrderServiceImpl(getMemberRepository(), getDiscountPolicy());
    }

    @Bean
    public DiscountPolicy getDiscountPolicy() {
        return new RateDiscountPolicy();
    }

}
  • XML

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="memberService" class="dh0023.springcore.member.service.MemberServiceImpl">
        <constructor-arg name="memberRepository" ref="memberRepository"/>
    </bean>

    <bean id="memberRepository" class="dh0023.springcore.member.repository.MemoryMemberRepository" />

    <bean id="orderService" class="dh0023.springcore.order.service.OrderServiceImpl">
        <constructor-arg name="memberRepository" ref="memberRepository"/>
        <constructor-arg name="discountPolicy" ref="discountPolicy"/>
    </bean>
    <bean id="discountPolicy" class="dh0023.springcore.discount.service.RateDiscountPolicy" />
</beans>
package dh0023.springcore.xml;

import dh0023.springcore.member.service.MemberService;
import dh0023.springcore.member.service.MemberServiceImpl;
import org.junit.jupiter.api.Test;
import org.springframework.context.support.GenericXmlApplicationContext;

import static org.assertj.core.api.Assertions.assertThat;

public class XmlAppContext {

    @Test
    void xmlAppContext() {
        GenericXmlApplicationContext ac = new GenericXmlApplicationContext("appConfig.xml");
        MemberService memberService = ac.getBean("memberService", MemberService.class);
        assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }
}

BeanDefinition - ๋นˆ ์„ค์ • ๋ฉ”ํƒ€ ์ •๋ณด

์Šคํ”„๋ง์€ BeanDefinition ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์ค‘์‹ฌ์œผ๋กœ ๋‹ค์–‘ํ•œ ์„ค์ • ํ˜•์‹์„ ์ง€์›ํ•˜๊ณ  ์žˆ๋‹ค. ์‰ฝ๊ฒŒ ๋งํ•ด BeanDefinition ์€ ๋ฉ”ํƒ€ ์ •๋ณด๋ฅผ ๊ธฐ์–ตํ•˜๋Š” ์—ญํ• ์„ ํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๋Š” ์ž๋ฐ”์ฝ”๋“œ๋กœ ์„ค์ •์ด ๋œ๊ฑด์ง€, XML ํŒŒ์ผ๋กœ ์„ค์ •์ด ๋œ๊ฑด์ง€ ๋ชฐ๋ผ๋„ ๋œ๋‹ค.

BeanDefinition ์€ ๋นˆ ์„ค์ • ๋ฉ”ํƒ€ ์ •๋ณด๋ผ ํ•˜๋ฉฐ, @Bean , <bean> ๋‹น ๊ฐ๊ฐ ํ•˜๋‚˜์˜ ๋ฉ”ํƒ€ ์ •๋ณด๊ฐ€ ์ƒ์„ฑ๋œ๋‹ค. ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๋Š” ์ด ๋ฉ”ํƒ€์ •๋ณด๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ์Šคํ”„๋ง ๋นˆ์„ ์ƒ์„ฑํ•œ๋‹ค.

https://blog.kakaocdn.net/dn/JwjDQ/btqVK7wRdbA/F2JCWl67gjnKzUsQLR0e71/img.png
  1. AnnotaionConfigApplicationContext ๋Š” AnnotatedBeanDefinitionReader ๋ฅผ ์‚ฌ์šฉํ•ด AppConfig.class (@Configuration ํŒŒ์ผ) ๋ฅผ ์ฝ๊ณ  BeanDefinition ์„ ์ƒ์„ฑํ•œ๋‹ค.

  2. GenericXmlApplicationContext๋Š” XmlBeanDefinitionReader ๋ฅผ ์‚ฌ์šฉํ•ด appConfig.xml ๋ฅผ ์ฝ๊ณ  BeanDefinition ์„ ์ƒ์„ฑํ•œ๋‹ค.

  3. ์ƒˆ๋กœ์šด ํ˜•์‹์˜ ๊ฒฝ์šฐ์—๋Š” XxxBeanDefinitionReader ๋ฅผ ์ƒ์„ฑํ•˜์—ฌ, BeanDefinition ์„ ์ƒ์„ฑํ•˜๋ฉด ๋œ๋‹ค.

์ •๋ณด

package dh0023.springcore.beandefinition;

import dh0023.springcore.config.AppConfig;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class BeanDefinitionTest {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);

    @Test
    @DisplayName("๋นˆ ์„ค์ • ๋ฉ”ํƒ€์ •๋ณด ํ™•์ธ")
    void findApplicationBean() {
        String[] beanDefinitionNames = ac.getBeanDefinitionNames();

        for (String beanDefinitionName : beanDefinitionNames) {
            BeanDefinition beanDefinition = ac.getBeanDefinition(beanDefinitionName);

            if (beanDefinition.getRole() == BeanDefinition.ROLE_APPLICATION) {
                System.out.println("BeanDefinitionName = " + beanDefinitionName + " beanDefinition = " + beanDefinition);
            }

        }
    }
}
// Java Config
// ์ž๋ฐ” ์„ค์ •์€ ํŒฉํ† ๋ฆฌ ๋ฉ”์„œ๋“œ ๋ฐฉ์‹์œผ๋กœ ์ƒ์„ฑ
BeanDefinitionName = appConfig beanDefinition = Generic bean: class [dh0023.springcore.config.AppConfig$$EnhancerBySpringCGLIB$$eadd5c79]; scope=singleton; abstract=false; lazyInit=null; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null
BeanDefinitionName = memberService beanDefinition = Root bean: class [null]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=appConfig; factoryMethodName=memberService; initMethodName=null; destroyMethodName=(inferred); defined in dh0023.springcore.config.AppConfig
BeanDefinitionName = getMemberRepository beanDefinition = Root bean: class [null]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=appConfig; factoryMethodName=getMemberRepository; initMethodName=null; destroyMethodName=(inferred); defined in dh0023.springcore.config.AppConfig
BeanDefinitionName = orderService beanDefinition = Root bean: class [null]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=appConfig; factoryMethodName=orderService; initMethodName=null; destroyMethodName=(inferred); defined in dh0023.springcore.config.AppConfig
BeanDefinitionName = getDiscountPolicy beanDefinition = Root bean: class [null]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=appConfig; factoryMethodName=getDiscountPolicy; initMethodName=null; destroyMethodName=(inferred); defined in dh0023.springcore.config.AppConfig
package dh0023.springcore.beandefinition;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.support.GenericXmlApplicationContext;

public class BeanDefinitionTest {

    GenericXmlApplicationContext ac = new GenericXmlApplicationContext("appConfig.xml");

    @Test
    @DisplayName("๋นˆ ์„ค์ • ๋ฉ”ํƒ€์ •๋ณด ํ™•์ธ")
    void findApplicationBean() {
        String[] beanDefinitionNames = ac.getBeanDefinitionNames();

        for (String beanDefinitionName : beanDefinitionNames) {
            BeanDefinition beanDefinition = ac.getBeanDefinition(beanDefinitionName);

            if (beanDefinition.getRole() == BeanDefinition.ROLE_APPLICATION) {
                System.out.println("BeanDefinitionName = " + beanDefinitionName + " beanDefinition = " + beanDefinition);
            }

        }
    }
}
// xml Config
BeanDefinitionName = memberService beanDefinition = Generic bean: class [dh0023.springcore.member.service.MemberServiceImpl]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [appConfig.xml]
BeanDefinitionName = memberRepository beanDefinition = Generic bean: class [dh0023.springcore.member.repository.MemoryMemberRepository]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [appConfig.xml]
BeanDefinitionName = orderService beanDefinition = Generic bean: class [dh0023.springcore.order.service.OrderServiceImpl]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [appConfig.xml]
BeanDefinitionName = discountPolicy beanDefinition = Generic bean: class [dh0023.springcore.discount.service.RateDiscountPolicy]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [appConfig.xml]
  • BeanClassName: ์ƒ์„ฑํ•  ๋นˆ์˜ ํด๋ž˜์Šค ๋ช…(์ž๋ฐ” ์„ค์ • ์ฒ˜๋Ÿผ ํŒฉํ† ๋ฆฌ ์—ญํ• ์˜ ๋นˆ์„ ์‚ฌ์šฉํ•˜๋ฉด ์—†์Œ)

  • factoryBeanName: ํŒฉํ† ๋ฆฌ ์—ญํ• ์˜ ๋นˆ์„ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ ์ด๋ฆ„, ์˜ˆ) appConfig

  • factoryMethodName: ๋นˆ์„ ์ƒ์„ฑํ•  ํŒฉํ† ๋ฆฌ ๋ฉ”์„œ๋“œ ์ง€์ •, ์˜ˆ) memberService

  • Scope: ์‹ฑ๊ธ€ํ†ค(๊ธฐ๋ณธ๊ฐ’)

  • lazyInit: ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๋ฅผ ์ƒ์„ฑํ•  ๋•Œ ๋นˆ์„ ์ƒ์„ฑํ•˜๋Š” ๊ฒƒ์ด ์•„๋‹ˆ๋ผ, ์‹ค์ œ ๋นˆ์„ ์‚ฌ์šฉํ•  ๋•Œ ๊นŒ์ง€ ์ตœ๋Œ€ํ•œ ์ƒ์„ฑ์„ ์ง€์—ฐ์ฒ˜๋ฆฌ ํ•˜๋Š”์ง€ ์—ฌ๋ถ€

  • InitMethodName: ๋นˆ์„ ์ƒ์„ฑํ•˜๊ณ , ์˜์กด๊ด€๊ณ„๋ฅผ ์ ์šฉํ•œ ๋’ค์— ํ˜ธ์ถœ๋˜๋Š” ์ดˆ๊ธฐํ™” ๋ฉ”์„œ๋“œ ๋ช…

  • DestroyMethodName: ๋นˆ์˜ ์ƒ๋ช…์ฃผ๊ธฐ๊ฐ€ ๋๋‚˜์„œ ์ œ๊ฑฐํ•˜๊ธฐ ์ง์ „์— ํ˜ธ์ถœ๋˜๋Š” ๋ฉ”์„œ๋“œ ๋ช…

  • Constructor arguments, Properties: ์˜์กด๊ด€๊ณ„ ์ฃผ์ž…์—์„œ ์‚ฌ์šฉ (์ž๋ฐ” ์„ค์ • ์ฒ˜๋Ÿผ ํŒฉํ† ๋ฆฌ ์—ญํ• ์˜ ๋นˆ์„ ์‚ฌ์šฉํ•˜๋ฉด ์—†์Œ)

์ด๋Ÿฌํ•œ ๋ฉ”ํƒ€์ •๋ณด๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ์Šคํ”„๋ง ์ปจํ…Œ์ด๋„ˆ๋ฅผ ์ƒ์„ฑํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

์‹ค๋ฌด์—์„œ๋Š” BeanDefinition ์„ ์ง์ ‘ ์ •์˜ํ•˜๊ฑฐ๋‚˜ ์‚ฌ์šฉํ•  ์ผ์€ ์—†์œผ๋ฏ€๋กœ, ์Šคํ”„๋ง์ด ๋‹ค์–‘ํ•œ ํ˜•ํƒœ์˜ ์„ค์ • ์ •๋ณด๋ฅผ BeanDefinition ์„ ์ถ”์ƒํ™”ํ•ด์„œ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ ์ •๋„๋งŒ ์ดํ•ดํ•˜๋ฉด ๋œ๋‹ค.

์ฐธ๊ณ 

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