spring core : component scan

spring-core/basic/src/main/java/com/example/basic/AutoAppConfig.java

@@ -0,0 +1,21 @@
+package com.example.basic;
+
+import com.example.basic.member.MemberRepository;
+import com.example.basic.member.MemoryMemberRepository;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.FilterType;
+
+@Configuration
+@ComponentScan(
+        basePackages = "com.example.basic", // default : @ComponentScan 의 위치  패키지
+        excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Configuration.class)
+)
+public class AutoAppConfig {
+
+    @Bean(name = "memoryMemberRepository") // 수동 빈, 자동 빈 이름 같을 경우 수동 빈이 우선순위를 가진다.( 최근 스프링 부트는 에러 )
+    MemberRepository memberRepository() {
+        return new MemoryMemberRepository();
+    }
+}

spring-core/basic/src/main/java/com/example/basic/discount/RateDiscountPolicy.java

@@ -2,7 +2,9 @@ package com.example.basic.discount;
 
 import com.example.basic.member.Grade;
 import com.example.basic.member.Member;
+import org.springframework.stereotype.Component;
 
+@Component
 public class RateDiscountPolicy implements DiscountPolicy {
 
     private final int discountPercent = 10;

spring-core/basic/src/main/java/com/example/basic/member/MemberServiceImpl.java

@@ -1,9 +1,14 @@
 package com.example.basic.member;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
 public class MemberServiceImpl implements MemberService {
 
     private final MemberRepository memberRepository;
 
+    @Autowired
     public MemberServiceImpl(MemberRepository memberRepository) {
         this.memberRepository = memberRepository;
     }

spring-core/basic/src/main/java/com/example/basic/member/MemoryMemberRepository.java

@@ -1,8 +1,11 @@
 package com.example.basic.member;
 
+import org.springframework.stereotype.Component;
+
 import java.util.HashMap;
 import java.util.Map;
 
+@Component
 public class MemoryMemberRepository implements MemberRepository {
 
     private static final Map<Long, Member> store = new HashMap<>();

spring-core/basic/src/main/java/com/example/basic/order/OrderServiceImpl.java

@@ -3,12 +3,16 @@ package com.example.basic.order;
 import com.example.basic.discount.DiscountPolicy;
 import com.example.basic.member.Member;
 import com.example.basic.member.MemberRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
 
+@Component
 public class OrderServiceImpl implements OrderService {
 
     private final MemberRepository memberRepository;
     private final DiscountPolicy discountPolicy;
 
+    @Autowired
     public OrderServiceImpl(MemberRepository memberRepository, DiscountPolicy discountPolicy) {
         this.memberRepository = memberRepository;
         this.discountPolicy = discountPolicy;

spring-core/basic/src/test/java/com/example/basic/scan/AutoAppConfigTest.java

@@ -0,0 +1,20 @@
+package com.example.basic.scan;
+
+import com.example.basic.AutoAppConfig;
+import com.example.basic.member.MemberService;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+import static org.assertj.core.api.Assertions.*;
+
+class AutoAppConfigTest {
+
+    @Test
+    void basicScan() {
+        AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(AutoAppConfig.class);
+
+        MemberService memberService = ac.getBean(MemberService.class);
+        assertThat(memberService).isInstanceOf(MemberService.class);
+    }
+}

spring-core/basic/src/test/java/com/example/basic/scan/filter/BeanA.java

@@ -0,0 +1,5 @@
+package com.example.basic.scan.filter;
+
+@MyIncludeComponent
+public class BeanA {
+}

spring-core/basic/src/test/java/com/example/basic/scan/filter/BeanB.java

@@ -0,0 +1,5 @@
+package com.example.basic.scan.filter;
+
+@MyExcludeComponent
+public class BeanB {
+}

spring-core/basic/src/test/java/com/example/basic/scan/filter/ComponentFilterAppConfigTest.java

@@ -0,0 +1,36 @@
+package com.example.basic.scan.filter;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.FilterType;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+class ComponentFilterAppConfigTest {
+
+    @Test
+    void filterScan() {
+        AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(ComponentFilterAppConfig.class);
+        BeanA beanA = ac.getBean("beanA", BeanA.class);
+        assertThat(beanA).isNotNull();
+
+        assertThrows(
+                NoSuchBeanDefinitionException.class,
+                () -> ac.getBean("beanB", BeanB.class)
+        );
+    }
+
+    @Configuration
+    @ComponentScan(
+            includeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = MyIncludeComponent.class),
+            excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = MyExcludeComponent.class)
+    )
+    static class ComponentFilterAppConfig {
+
+    }
+}

spring-core/basic/src/test/java/com/example/basic/scan/filter/MyExcludeComponent.java

@@ -0,0 +1,9 @@
+package com.example.basic.scan.filter;
+
+import java.lang.annotation.*;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface MyExcludeComponent {
+}

spring-core/basic/src/test/java/com/example/basic/scan/filter/MyIncludeComponent.java

@@ -0,0 +1,9 @@
+package com.example.basic.scan.filter;
+
+import java.lang.annotation.*;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface MyIncludeComponent {
+}