spring core aop : proxy - internal call solution

spring-core/aop/src/main/java/com/example/aop/internalcall/CallServiceV1.java

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+package com.example.aop.internalcall;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+/**
+ * 프록시 내부 호출 해결 1. 자기 자신 주입
+ */
+@Slf4j
+@Component
+public class CallServiceV1 {
+
+   // 스프링 컨테이너에서 주입 받으면 프록시 주입
+   private CallServiceV1 callServiceV1;
+
+    // 자기 자신을 주입하므로 생성자 주입 시 순환 참조가 일어 나므로 세터로 주입
+    @Autowired
+    public void setCallServiceV1(CallServiceV1 callServiceV1) {
+        this.callServiceV1 = callServiceV1;
+    }
+
+    public void external() {
+        log.info("call external");
+        callServiceV1.internal(); // 외부 메소드 호출로 변경
+    }
+
+    public void internal() {
+        log.info("call internal");
+    }
+}

spring-core/aop/src/main/java/com/example/aop/internalcall/CallServiceV2.java

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+package com.example.aop.internalcall;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.context.ApplicationContext;
+import org.springframework.stereotype.Component;
+
+/**
+ * 프록시 내부 호출 해결 2. 지연 조회 - ApplicationContext, ObjectProvider 이용
+ */
+@Slf4j
+@Component
+public class CallServiceV2 {
+
+//    private final ApplicationContext applicationContext;
+    private final ObjectProvider<CallServiceV2> callServiceProvider;
+
+    public CallServiceV2(ObjectProvider<CallServiceV2> callServiceProvider) {
+        this.callServiceProvider = callServiceProvider;
+    }
+
+    public void external() {
+        log.info("call external");
+//        CallServiceV2 callServiceV2 = applicationContext.getBean(CallServiceV2.class);
+        CallServiceV2 callServiceV2 = callServiceProvider.getObject();
+        callServiceV2.internal(); // 외부 메소드 호출로 변경
+    }
+
+    public void internal() {
+        log.info("call internal");
+    }
+}

spring-core/aop/src/main/java/com/example/aop/internalcall/CallServiceV3.java

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+package com.example.aop.internalcall;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+/**
+ * 프록시 내부 호출 해결 3. 구조 변경(분리)
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class CallServiceV3 {
+
+    private final InternalService internalService;
+
+    public void external() {
+        log.info("call external");
+        internalService.internal(); // 외부 메소드 호출
+    }
+
+}

spring-core/aop/src/main/java/com/example/aop/internalcall/InternalService.java

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+package com.example.aop.internalcall;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@Component
+public class InternalService {
+
+    public void internal() {
+        log.info("call internal");
+    }
+}

spring-core/aop/src/main/resources/application.properties

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+spring.main.allow-circular-references=true

spring-core/aop/src/test/java/com/example/aop/internalcall/CallServiceV1Test.java

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+package com.example.aop.internalcall;
+
+import com.example.aop.internalcall.aop.CallLogAspect;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+
+@Slf4j
+@Import(CallLogAspect.class)
+@SpringBootTest
+class CallServiceV1Test {
+
+    @Autowired
+    CallServiceV1 callServiceV1;
+
+    @Test
+    void external() {
+        callServiceV1.external();
+    }
+
+    @Test
+    void internal() {
+        callServiceV1.internal();
+    }
+}

spring-core/aop/src/test/java/com/example/aop/internalcall/CallServiceV2Test.java

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+package com.example.aop.internalcall;
+
+import com.example.aop.internalcall.aop.CallLogAspect;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+
+@Slf4j
+@Import(CallLogAspect.class)
+@SpringBootTest
+class CallServiceV2Test {
+
+    @Autowired
+    CallServiceV2 callServiceV2;
+
+    @Test
+    void external() {
+        callServiceV2.external();
+    }
+
+    @Test
+    void internal() {
+        callServiceV2.internal();
+    }
+}

spring-core/aop/src/test/java/com/example/aop/internalcall/CallServiceV3Test.java

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+package com.example.aop.internalcall;
+
+import com.example.aop.internalcall.aop.CallLogAspect;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+
+@Slf4j
+@Import(CallLogAspect.class)
+@SpringBootTest
+class CallServiceV3Test {
+
+    @Autowired
+    CallServiceV3 callServiceV3;
+
+    @Test
+    void external() {
+        callServiceV3.external();
+    }
+}