[Spring] @RequiredArgsConstructor

package hello.core.order;

import hello.core.discount.DiscountPolicy;
import hello.core.member.Member;
import hello.core.member.MemberRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;

@Component
@RequiredArgsConstructor
public class OrderServiceImpl implements OrderService {

    private final MemberRepository memberRepository;
    private final DiscountPolicy discountPolicy;

    @Override
    public Order createOrder(Long memberId, String itemName, int itemPrice) {
        Member member = memberRepository.findById(memberId);
        int discountPrice = discountPolicy.discount(member, itemPrice);

        return new Order(memberId, itemName, itemPrice, discountPrice);
    }

    //테스트 용도
    public MemberRepository getMemberRepository(){
        return memberRepository;
    }
}

-> @RequiredArgsConstructor 어노테이션은 final이 붙은거를 생성자를 자동으로 만들어줌

 

ex)

 @Autowired
    public OrderServiceImpl(MemberRepository memberRepository, DiscountPolicy discountPolicy) {
        this.memberRepository = memberRepository;
        this.discountPolicy = discountPolicy;
    }