빈 후처리기 - 적용

Author: zingwang

proxy/src/main/java/hello/proxy/ProxyApplication.java

@@ -8,8 +8,10 @@
 import hello.proxy.config.v2_dynamicproxy.DynamicProxyFilterConfig;
 import hello.proxy.config.v3_proxyfactory.ProxyFactoryConfigV1;
 import hello.proxy.config.v3_proxyfactory.ProxyFactoryConfigV2;
+import hello.proxy.config.v4_postprocessor.BeanPostProcessorConfig;
 import hello.proxy.trace.logtrace.LogTrace;
 import hello.proxy.trace.logtrace.ThreadLocalLogTrace;
+import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
@@ -19,7 +21,9 @@
 //@Import({InterfaceProxyConfig.class, ConcreteProxyConfig.class})
 //@Import(DynamicProxyFilterConfig.class)//dynamic proxy
 //@Import(ProxyFactoryConfigV1.class)//dynamic proxy
-@Import(ProxyFactoryConfigV2.class)//dynamic proxy
+//@Import(ProxyFactoryConfigV2.class)//dynamic proxy
+@Import(BeanPostProcessorConfig.class)//dynamic proxy
+
 @SpringBootApplication(scanBasePackages = "hello.proxy.app") //주의
 public class ProxyApplication {
 	public static void main(String[] args) {

proxy/src/main/java/hello/proxy/config/v4_postprocessor/BeanPostProcessorConfig.java

@@ -0,0 +1,34 @@
+package hello.proxy.config.v4_postprocessor;
+
+import hello.proxy.config.AppV1Config;
+import hello.proxy.config.AppV2Config;
+import hello.proxy.config.v3_proxyfactory.advice.LogTraceAdvice;
+import hello.proxy.config.v4_postprocessor.postprocessor.PackageLogTracePostProcessor;
+import hello.proxy.trace.logtrace.LogTrace;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.aop.Advisor;
+import org.springframework.aop.support.DefaultPointcutAdvisor;
+import org.springframework.aop.support.NameMatchMethodPointcut;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+
+@Slf4j
+@Configuration
+@Import({AppV1Config.class, AppV2Config.class})
+public class BeanPostProcessorConfig {
+
+    @Bean
+    public PackageLogTracePostProcessor logTracePostProcessor(LogTrace logTrace){
+        return new PackageLogTracePostProcessor("hello.proxy.app",getAdvisor(logTrace));
+    }
+
+    private Advisor getAdvisor(LogTrace logTrace) {
+        //pointcut
+        NameMatchMethodPointcut pointcut = new NameMatchMethodPointcut();
+        pointcut.setMappedNames("request*", "order*", "save*");
+        //advice
+        LogTraceAdvice advice = new LogTraceAdvice(logTrace);
+        return new DefaultPointcutAdvisor(advice);
+    }
+}

proxy/src/main/java/hello/proxy/config/v4_postprocessor/postprocessor/PackageLogTracePostProcessor.java

@@ -0,0 +1,39 @@
+package hello.proxy.config.v4_postprocessor.postprocessor;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.aop.Advisor;
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+
+@Slf4j
+public class PackageLogTracePostProcessor implements BeanPostProcessor {
+
+    private final String basePackage;
+    private final Advisor advisor;
+
+    public PackageLogTracePostProcessor(String basePackage, Advisor advisor) {
+        this.basePackage = basePackage;
+        this.advisor = advisor;
+    }
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+        log.info("param beanName={} name={}", beanName, bean.getClass());
+        //프록시 적용 대상 여부 체크
+        //프록시 적용 대상이 아니면 원본을 그대로 진행
+        String packageName = bean.getClass().getPackageName();
+        if(!packageName.startsWith(basePackage)){
+            return bean;
+        }
+
+        // 프록시 대상이면 프록시를 만들어서 반환
+        ProxyFactory proxyFactory = new ProxyFactory(bean);
+        proxyFactory.addAdvisor(advisor);
+
+        Object proxy = proxyFactory.getProxy();
+        log.info("create proxy: target={] proxy={}", bean.getClass(), proxy.getClass());
+        return proxy;
+        //return BeanPostProcessor.super.postProcessAfterInitialization(bean, beanName);
+    }
+}