(스프링 기본) 24 - 조회된 빈이 모두 필요할 때 (List, Map)

해당 빈이 모두 필요할 경우 List 또는 Map 을 활용하면 된다. 

public class AllBeanTest {

    @Test
    void findAllBean() {
        ApplicationContext ac = new AnnotationConfigApplicationContext(AutoAppConfig.class, DiscountService.class);
    }

    static class DiscountService {
        private final Map<String, DiscountPolicy> policyMap;
        private final List<DiscountPolicy> policies;

        @Autowired
        public DiscountService(Map<String, DiscountPolicy> policyMap, List<DiscountPolicy> policies) {
            this.policyMap = policyMap;
            this.policies = policies;
            System.out.println("policyMap = " + policyMap);
            System.out.println("policies = " + policies);
        }
    }
}

 

이렇게 하면 등록된 빈을 모두 조회한다. 

 

static class DiscountService {
    private final Map<String, DiscountPolicy> policyMap;
    private final List<DiscountPolicy> policies;

    @Autowired
    public DiscountService(Map<String, DiscountPolicy> policyMap, List<DiscountPolicy> policies) {
        this.policyMap = policyMap;
        this.policies = policies;
        System.out.println("policyMap = " + policyMap);
        System.out.println("policies = " + policies);
    }

    public int discount(Member member, int price, String discountCode) {
        DiscountPolicy discountPolicy = policyMap.get(discountCode);
        return discountPolicy.discount(member, price);
    }
}

 

DiscountService 는 Map 으로 모든 DiscountPolicy 를 주입 받는다. 

따라서 fixDiscountPolicy 와 rateDiscountPolicy 가 주입된다.

 

discount() 메서드는 discountCode 로 fixDiscountPolicy 가 넘어오면 map 에서 

fixDiscountPolicy 빈을 찾아서 실행한다. 

 

출처 : 김영한 스프링 핵심 원리 - 기본편

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