Spring3.X, Spring3.X Framework, AOP강좌, @AspectJ 어노테이션을 이용한 AOP구현예제(Spring Framework3.X AOP구현하기,Advice, Pointcut, Aspect)

Spring3.X, Spring3.X Framework, AOP강좌, @AspectJ 어노테이션을 이용한 AOP구현예제(Spring Framework3.X AOP구현하기,Advice, Pointcut, Aspect)
- 다음과 같은 인터페이스와 타겟 클레스가 있다. 

package onj.aop.aspectjannotation;

interface OnjWorld {

public void onjHello();

public void onjHello2() throws Exception;

}

package onj.aop.aspectjannotation;

//Target Class

public class OnjWorldImpl implements OnjWorld {

public void onjHello() {

System.out.println("OnJ에오신것을 환영합니다.");

}

public void onjHello2() throws Exception {

System.out.println("OnJ2에오신것을 환영합니다.");

throw new Exception("OnJ Exception...");

}

}

위 OnjWorldImpl이 타겟 클래스이다. onjHello2 로 시작하는 메소드에 스프링 충고를 내릴려고 한다. 
충고(Advice)는 적당히 콘솔화면에 출력하는 정도로 만들고... 
before advice, around advice, throws advice, after,after returning advice를 구현하시오. 

- @AspectJ Annotation을 이용하여 구현해 보았다.

가장 핵심이 되는 클래스는 Aspect인 AonjLoggingAspect이다. 그안에 충고, 포인트컷에 대한 AspectJ 표현식등이 기술되어 Aspect(Advice + PointCut)를   만든다.

1. OnjWorld.java

package onj.aop.aspectjannotation;

interface OnjWorld {

public void onjHello();

public void onjHello2() throws Exception;

}

2. OnjWorldImpl.java

package onj.aop.aspectjannotation;

public class OnjWorldImpl implements OnjWorld {

public void onjHello() {

System.out.println("OnJ에오신것을 환영합니다.");

}

public void onjHello2() throws Exception {

System.out.println("OnJ2에오신것을 환영합니다.");

throw new Exception("OnJ Exception...");

}

}

3.  OnjLoggingAspect.java

package onj.aop.aspectjannotation;

import java.util.Arrays;

import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.AfterThrowing;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

@Aspect

public class OnjLoggingAspect {

 //사전충고(Before Advice)

 @Before("execution (* onj.aop.aspectjannotation.OnjWorld.onjHello(..))")

 public void logBefore(JoinPoint joinPoint){

  System.out.println("<<<<< Advice-->logBefore()...");

  joinPoint.getSignature().getName();

 }

 

 //사후중고(After Advice), 타겟메소드 실행 후 즉시 실행

 @After("execution (* onj.aop.aspectjannotation.OnjWorld.onjHello(..))")

 public void logAfter(JoinPoint joinPoint){

  System.out.println("<<<<< Advice --> logAfter()...");

  joinPoint.getSignature().getName();

 }

 

 //사후중고(After Returnning Advice), 타겟메소드 리턴 후 실행

 @AfterReturning(pointcut = "execution (* onj.aop.aspectjannotation.OnjWorld.onjHello(..))", returning="result")

 public void logAfterReturning(JoinPoint joinPoint, Object result){

  System.out.println("<<<<< Advice --> logAfterReturning()...");

  joinPoint.getSignature().getName();

  System.out.println("<<<<< return value is " + result);

 }

 

 //주변충고(Around Advice), 타겟메소드 실행전, 리턴 후 두번 충고 실행 

 @Around("execution (* onj.aop.aspectjannotation.OnjWorld.onjHello(..))")

 public String logAround(ProceedingJoinPoint joinPoint) throws Throwable{

  System.out.println("<<<<< Advice --> logAournd()...");

  joinPoint.getSignature().getName();

  Arrays.toString(joinPoint.getArgs());

  System.out.println("<<<<< Around before is renning!");

  joinPoint.proceed();

  System.out.println("<<<<< Around after is renning!)");

  return "이 문장으로 원래 타겟메소드 리턴이 대체됨!";

 }

 

 //예외충고(Throws Advice), 예외가 발생했을 때 예외전에 충고실행

 @AfterThrowing(pointcut = "execution (* onj.aop.aspectjannotation.OnjWorld.onjHello2(..))", throwing = "error")

 public void logAfterThrowing(JoinPoint joinPoint, Throwable error){

  System.out.println("<<<<< Advice --> logAfterThrowing()...");

  joinPoint.getSignature().getName();

  System.out.println("<<<<< Exception " +error);

 }

}

4. OnjClient.java

package onj.aop.aspectjannotation;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class OnjClient {

 public static void main(String[] args) throws Exception{

  ApplicationContext ctx =new ClassPathXmlApplicationContext("aspectjannotation.xml"); 

  

  OnjWorld o = (OnjWorld)ctx.getBean("onjWorld");

  

  o.onjHello();

  o.onjHello2();

 }

}

5. src/main/resource/aspectjannotation.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

 xmlns:aop="http://www.springframework.org/schema/aop"

 xsi:schemaLocation="http://www.springframework.org/schema/beans 

 http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

 http://www.springframework.org/schema/aop 

 http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">

 

 <aop:aspectj-autoproxy />

 

 <bean id="onjWorld" class="onj.aop.aspectjannotation.OnjWorldImpl" />

 <bean id="onjLogger" class="onj.aop.aspectjannotation.OnjLoggingAspect" />

 

</beans>

6.[결과]

SLF4J: Class path contains multiple SLF4J bindings.

SLF4J: Found binding in [jar:file:/C:/java/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: Found binding in [jar:file:/C:/Documents%20and%20Settings/Administrator/.m2/repository/org/slf4j/slf4j-log4j12/1.6.6/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]

INFO : org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6250d2: startup date [Tue Feb 04 07:20:40 KST 2014]; root of context hierarchy

INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [aspectjannotation.xml]

INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1518883: defining beans [org.springframework.aop.config.internalAutoProxyCreator,onjWorld,onjLogger]; root of factory hierarchy

<<<<< Advice --> logAournd()...

<<<<< Around before is renning!

<<<<< Advice-->logBefore()...

OnJ에오신것을 환영합니다.

<<<<< Around after is renning!)

<<<<< Advice --> logAfter()...

<<<<< Advice --> logAfterReturning()...

<<<<< return value is 이 문장으로 원래 타겟메소드 리턴이 대체됨!

OnJ2에오신것을 환영합니다.

<<<<< Advice --> logAfterThrowing()...

<<<<< Exception java.lang.Exception: OnJ Exception...

Exception in thread "main" java.lang.Exception: OnJ Exception...

at onj.aop.aspectjannotation.OnjWorldImpl.onjHello2(OnjWorldImpl.java:10)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)

at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)

at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:55)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)

at onj.aop.aspectjannotation.$Proxy9.onjHello2(Unknown Source)

at onj.aop.aspectjannotation.OnjClient.main(OnjClient.java:12)

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