스프링 컨테이너

ApplicaitonContext

AnnotationConfigApplicationContext ac =
		new AnnotationConfigApplicationContext(AppConfig.class);

• 스프링 컨테이너라고 부름
• 인터페이스

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스프링 컨테이너 생성 과정

인프런 강의 참조

• 스프링 컨테이너를 생성할 때는 구성 정보를 지정해주어야 함
• 여기서는 AppConfig.class를 구성 정보로 지정

인프런 강의 참조

• 빈 이름은 메서드 이름을 사용
• 빈 이름은 직접 부여 가능
  • @Bean(name = "빈 이름 지정")
• 빈 이름은 항상 다른 이름을 부여

인프런 강의 참조

인프런 강의 참조

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스프링으로 전환하기

package hello.core;

import hello.core.discount.DiscountPolicy;
import hello.core.discount.FixDiscountPolicy;
import hello.core.discount.RateDiscountPolicy;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import hello.core.member.MemoryMemberRepository;
import hello.core.order.OrderService;
import hello.core.order.OrderServiceImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig {

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

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

    @Bean
    public OrderService orderService(){
        return new OrderServiceImpl(memberRepository(), discountPolicy());
    }

    @Bean
    public DiscountPolicy discountPolicy(){
//        return new FixDiscountPolicy();
        return new RateDiscountPolicy();
    }
}

• @Configuration 추가
• @Bean 추가

package hello.core;

import hello.core.member.Grade;
import hello.core.member.Member;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import hello.core.order.Order;
import hello.core.order.OrderService;
import hello.core.order.OrderServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class OrderApp {

    public static void main(String[] args) {

//        AppConfig appConfig = new AppConfig();
//        MemberService memberService = appConfig.memberService();
//        OrderService orderService = appConfig.orderService();
//        MemberService memberService = new MemberServiceImpl();
//        OrderServiceImpl orderService = new OrderServiceImpl();

        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
        MemberService memberService = applicationContext.getBean("memberService", MemberService.class);
        OrderService orderService = applicationContext.getBean("orderService", OrderService.class);

        Long memberId = 1L;
        Member member = new Member(memberId, "memberA", Grade.VIP);
        memberService.join(member);

        Order order = orderService.createOrder(memberId, "itemA", 20000);
        System.out.println("order = " + order);
    }
}

• 스프링 컨테이너 생성