ApplicationContext

package hello.core.beanfind;

import hello.core.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 ApplicationContextInfoTest {

    AnnotationConfigApplicationContext ac 
            = new AnnotationConfigApplicationContext(AppConfig.class);

    @Test
    @DisplayName("모든 빈 출력하기")
    void findAllBean(){
        String[] beanDefinitionNames = ac.getBeanDefinitionNames();

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

        }
    }

    @Test
    @DisplayName("애플리케이션 빈 출력하기")
    void findApplicationBean(){
        String[] beanDefinitionNames = ac.getBeanDefinitionNames();

        for (String beanDefinitionName : beanDefinitionNames) {
            //BeanDefinition : bean 하나하나에 대한 메타 데이터 정보를 가져올 수 있음.
            BeanDefinition beanDefinition = ac.getBeanDefinition(beanDefinitionName);

            //Role ROLE_APPLICATION : 직접 등록한 애플리케이션 빈
            //Role ROLE_INFRASTRUCTURE : 스프링이 내부에서 사용하는 빈
            if(beanDefinition.getRole() == beanDefinition.ROLE_APPLICATION){
                Object bean = ac.getBean(beanDefinitionName);
                System.out.println("name = " + beanDefinitionName + " object = " + bean);
            }
        }
    }
}
// ApplicationContextInfoTest.java

package hello.core.beanfind;

import hello.core.AppConfig;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import org.assertj.core.api.Assertions;
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.junit.jupiter.api.Assertions.*;

public class ApplicationContextBasicFindTest {

    AnnotationConfigApplicationContext ac 
            = new AnnotationConfigApplicationContext(AppConfig.class);

    @Test
    @DisplayName("빈 이름으로 조회")
    void findBeanByName(){
        MemberService memberService = ac.getBean("memberService", MemberService.class);
        Assertions.assertThat(memberService).isInstanceOf(MemberServiceImpl.class);
    }

    @Test
    @DisplayName("이름 없이 타입으로만 조회")
    void findBeanByType(){
        //같은 타입이 여러개일 경우는 곤란해지지만 타입만으로도 조회 가능
        MemberService memberService = ac.getBean(MemberService.class);
        Assertions.assertThat(memberService).isInstanceOf(MemberServiceImpl.class);

    }

    @Test
    @DisplayName("구체 타입으로 조회")
    void findBeanByName2(){
        //같은 타입이 여러개일 경우는 곤란해지지만 타입만으로도 조회 가능
        MemberService memberService = ac.getBean("memberService", MemberServiceImpl.class);
        Assertions.assertThat(memberService).isInstanceOf(MemberServiceImpl.class);

    }

    @Test
    @DisplayName("빈 이름으로 조회X")
    void findBeanByNameX(){
        //없는걸 조회했을 때 예외가 터짐. (로그에서 예외 종류 확인)
        //MemberService xxxx = ac.getBean("xxxx", MemberService.class);
        assertThrows(NoSuchBeanDefinitionException.class, 
                () ->  ac.getBean("xxxx", MemberService.class));

    }


}
// ApplicationContextBasicFindTest.java

package hello.core.beanfind;

import hello.core.member.MemberRepository;
import hello.core.member.MemoryMemberRepository;
import org.junit.jupiter.api.Assertions;
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.*;

public class ApplicationContextSameBeanFindTest {

    AnnotationConfigApplicationContext ac 
            = new AnnotationConfigApplicationContext(SameBeanConfig.class);

    //중복 확인을 AppConfig 파일을 수정하지 않고 테스트하기 위해서 만듦
    @Configuration
    static class SameBeanConfig{

        @Bean
        public MemberRepository memberRepository1(){
            return new MemoryMemberRepository();
        }

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

    @Test
    @DisplayName("타입으로 조회시 같은 타입이 둘 이상 있으면, 중복 오류가 발생한다.")
    void FindBeanByTypeBuplicate(){
        //MemberRepository bean = ac.getBean(MemberRepository.class);
       Assertions.assertThrows(NoUniqueBeanDefinitionException.class, 
                () -> ac.getBean(MemberRepository.class));
    }

    @Test
    @DisplayName("타입으로 조회시 같은 타입이 둘 이상 있으면, 빈 이름을 지정하면 된다.")
    void findBeanByName(){
       MemberRepository memberRepository 
                = ac.getBean("memberRepository1",MemberRepository.class);
        assertThat(memberRepository).isInstanceOf(MemberRepository.class);
    }

    @Test
    @DisplayName("특정 타입을 모두 조회하기")
    void findAllBeanByType(){
        //getBeans()를 통해서 변수를 만들면 (Ctrl + Alt + V) Map 형태로 나옴.
        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);
    }
}
// ApplicationContextSameBeanFindTest.java

package hello.core.beanfind;

import hello.core.discount.DiscountPolicy;
import hello.core.discount.FixDiscountPolicy;
import hello.core.discount.RateDiscountPolicy;
import org.junit.jupiter.api.Assertions;
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.*;

public class ApplicationContextExtendsFindTest {

    AnnotationConfigApplicationContext ac 
            = new AnnotationConfigApplicationContext(TestConfig.class);

    @Configuration
    static class TestConfig {

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

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

    @Test
    @DisplayName("부모 타입으로 조회시, 자식이 둘 이상 있으면, 중복 오류가 발생한다.")
    void FindBeanByParentTypeDuplicate() {
        //DiscountPolicy bean = ac.getBean(DiscountPolicy.class);
        Assertions.assertThrows(NoUniqueBeanDefinitionException.class, 
                () -> ac.getBean(DiscountPolicy.class));
    }

    @Test
    @DisplayName("부모 타입으로 조회시, 자식이 둘 이상 있으면, 빈 이름을 지정하면 된다.")
    void FindBeanByParentTypeBeanName() {
        DiscountPolicy rateDiscountPolicy 
                = ac.getBean("rateDiscountPolicy", DiscountPolicy.class);
        assertThat(rateDiscountPolicy).isInstanceOf(RateDiscountPolicy.class);
    }

    @Test
    //안좋은 방법
    @DisplayName("특정 하위 타입으로 조회")
    void FindBeanByParentTypeSubType() {
        RateDiscountPolicy bean = ac.getBean(RateDiscountPolicy.class);
        assertThat(bean).isInstanceOf(RateDiscountPolicy.class);

    }

    @Test
    @DisplayName("부모 타입으로 모두 조회하기")
    void findAllBeanByParentType() {
        Map<String, DiscountPolicy> beansOfType 
                = ac.getBeansOfType(DiscountPolicy.class);
        assertThat(beansOfType.size()).isEqualTo(2);

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

    }

    @Test
    @DisplayName("부모 타입으로 모두 조회하기 - Object")
    void findAllBeanByObjectType(){
        Map<String, Object> beansOfType = ac.getBeansOfType(Object.class);
        for (String key : beansOfType.keySet()) {
            System.out.println("key = " + key + " value = " + beansOfType.get(key));
        }
    }
}
//ApplicationContextExtendsFindTest.java

<?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="hello.core.member.MemberServiceImpl">
        <constructor-arg name="memberRepository" ref="memberRepository" />
    </bean>
    <bean id="memberRepository"
          class="hello.core.member.MemoryMemberRepository" />
    <bean id="orderService" class="hello.core.order.OrderServiceImpl">
        <constructor-arg name="memberRepository" ref="memberRepository" />
        <constructor-arg name="discountPolicy" ref="discountPolicy" />
    </bean>
    <bean id="discountPolicy" class="hello.core.discount.RateDiscountPolicy" />
</beans>
// xml 설정 정보 파

package hello.core.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("빈 설정 메타 정보 확인")
    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);
            }
        }

    }
}
//BeanDefinitionTest.java