spring core proxy : invocation handler

spring-core/proxy/src/test/java/com/example/proxy/jdkdynamic/JdkDynamicProxyTest.java

@@ -0,0 +1,33 @@
+package com.example.proxy.jdkdynamic;
+
+import com.example.proxy.jdkdynamic.code.*;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Proxy;
+
+@Slf4j
+public class JdkDynamicProxyTest {
+
+    @Test
+    void dynamicA() {
+        AInterface target = new AImpl();
+        TimeInvocationHandler handler = new TimeInvocationHandler(target);
+        AInterface proxy = (AInterface) Proxy.newProxyInstance(AInterface.class.getClassLoader(), new Class[]{AInterface.class}, handler);
+
+        proxy.call();
+        log.info("targetClass={}", target.getClass());
+        log.info("proxyClass={}", proxy.getClass());
+    }
+
+    @Test
+    void dynamicB() {
+        BInterface target = new BImpl();
+        TimeInvocationHandler handler = new TimeInvocationHandler(target);
+        BInterface proxy = (BInterface) Proxy.newProxyInstance(BInterface.class.getClassLoader(), new Class[]{BInterface.class}, handler);
+
+        proxy.call();
+        log.info("targetClass={}", target.getClass());
+        log.info("proxyClass={}", proxy.getClass());
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/jdkdynamic/code/AImpl.java

@@ -0,0 +1,12 @@
+package com.example.proxy.jdkdynamic.code;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class AImpl implements AInterface {
+    @Override
+    public String call() {
+        log.info("A 호출");
+        return "A";
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/jdkdynamic/code/AInterface.java

@@ -0,0 +1,5 @@
+package com.example.proxy.jdkdynamic.code;
+
+public interface AInterface {
+    String call();
+}

spring-core/proxy/src/test/java/com/example/proxy/jdkdynamic/code/BImpl.java

@@ -0,0 +1,12 @@
+package com.example.proxy.jdkdynamic.code;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class BImpl implements BInterface {
+    @Override
+    public String call() {
+        log.info("B 호출");
+        return "B";
+    }
+}

spring-core/proxy/src/test/java/com/example/proxy/jdkdynamic/code/BInterface.java

@@ -0,0 +1,5 @@
+package com.example.proxy.jdkdynamic.code;
+
+public interface BInterface {
+    String call();
+}

spring-core/proxy/src/test/java/com/example/proxy/jdkdynamic/code/TimeInvocationHandler.java

@@ -0,0 +1,30 @@
+package com.example.proxy.jdkdynamic.code;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+
+@Slf4j
+public class TimeInvocationHandler implements InvocationHandler {
+
+    private final Object target;
+
+    public TimeInvocationHandler(Object target) {
+        this.target = target;
+    }
+
+    @Override
+    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+        log.info("TimeProxy 실행");
+        long startTime = System.currentTimeMillis();
+
+        Object result = method.invoke(target, args);
+
+        long endTime = System.currentTimeMillis();
+
+        long resultTime = endTime - startTime;
+        log.info("TimeProxy 종료 resultTime={}", resultTime);
+        return result;
+    }
+}