spring core proxy : cglib

spring-core/proxy/src/test/java/com/example/proxy/cglib/CglibTest.java

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+package com.example.proxy.cglib;
+
+import com.example.proxy.cglib.code.TimeMethodInterceptor;
+import com.example.proxy.common.service.ConcreteService;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.cglib.proxy.Enhancer;
+
+@Slf4j
+public class CglibTest {
+
+    @Test
+    void cglib() {
+        ConcreteService target = new ConcreteService();
+
+        Enhancer enhancer = new Enhancer();
+        enhancer.setSuperclass(ConcreteService.class);
+        enhancer.setCallback(new TimeMethodInterceptor(target));
+        ConcreteService proxy = (ConcreteService) enhancer.create();
+
+        log.info("targetClass={}", target.getClass());
+        log.info("proxyClass={}", proxy.getClass());
+
+        proxy.call();
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/cglib/code/TimeMethodInterceptor.java

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+package com.example.proxy.cglib.code;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.cglib.proxy.MethodInterceptor;
+import org.springframework.cglib.proxy.MethodProxy;
+
+import java.lang.reflect.Method;
+
+@Slf4j
+public class TimeMethodInterceptor implements MethodInterceptor {
+
+    private final Object target;
+
+    public TimeMethodInterceptor(Object target) {
+        this.target = target;
+    }
+
+    @Override
+    public Object intercept(Object obj, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
+        log.info("TimeProxy 실행");
+        long startTime = System.currentTimeMillis();
+
+        Object result = methodProxy.invoke(target, args);
+
+        long endTime = System.currentTimeMillis();
+
+        long resultTime = endTime - startTime;
+        log.info("TimeProxy 종료 resultTime={}", resultTime);
+        return result;
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/common/service/ConcreteService.java

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+package com.example.proxy.common.service;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class ConcreteService {
+
+    public void call() {
+        log.info("ConcreteService 호출");
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/common/service/ServiceImpl.java

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+package com.example.proxy.common.service;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class ServiceImpl implements ServiceInterface {
+    @Override
+    public void save() {
+        log.info("save 호출");
+    }
+
+    @Override
+    public void find() {
+        log.info("find 호출");
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/common/service/ServiceInterface.java

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+package com.example.proxy.common.service;
+
+public interface ServiceInterface {
+    void save();
+    void find();
+}