Annotation 직접 생성

인프런 스프링 핵심 원리 기본편을 정리한 글입니다.

 

import org.springframework.beans.factory.annotation.Qualifier;
import java.lang.annotation.*;

@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.TYPE, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Qualifier("mainDiscountPolicy")
public @interface MainDiscountPolicy {}

@Component
@MainDiscountPolicy
public class RateDiscountPolicy implements DiscountPolicy {}

public class OrderServiceImpl implements OrderService {
  private final MemberRepository memberRepository;
  private final DiscountPolicy discountPolicy;

  //생성자 자동 주입
  @Autowired
  public OrderServiceImpl(MemberRepository memberRepository,@MainDiscountPolicy DiscountPolicy discountPolicy) {
    this.memberRepository = memberRepository;
    this.discountPolicy = discountPolicy;
  }

  //수정자 자동 주입
  @Autowired
  public DiscountPolicy setDiscountPolicy(@MainDiscountPolicy DiscountPolicy discountPolicy) {
    this.discountPolicy = discountPolicy;
  }
}