AOP 구현(@Aspect 어노테이션 기반)

AOP 구현 방식 중 @Aspect 어노테이션을 기반으로 한 예제이다.

1. LogAop.java

package com.java.ex3;
 
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
 
@Aspect
public class LogAop {
    
    @Pointcut("bean(*ker)")        //~ker로 끝나는 빈에만 적용

    private void pointcutMethod() {
    }
    
    @Around("pointcutMethod()")
    public Object loggerAop(ProceedingJoinPoint joinpoint) throws Throwable {
        String signatureStr = joinpoint.getSignature().toShortString();
        System.out.println(signatureStr + "is start.");
        long st = System.currentTimeMillis();
        
        try {
            Object obj = joinpoint.proceed();
            return obj;
        } finally {
            long et = System.currentTimeMillis();
            System.out.println(signatureStr + " is finished.");
            System.out.println(signatureStr + " 경과시간 : " + (et - st));
        }
    }
    
    @Before("within(com.java.ex3.*)")
    public void beforeAdvice() {
        System.out.println("beforeAdvice()");
    }
}

2. MainClass.java

package com.java.ex3;
 
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
 
public class MainClass {
    public static void main(String[] args) {
        
        AbstractApplicationContext ctx
        = new GenericXmlApplicationContext("classpath:applicationCTX3.xml");
        
        Student student = ctx.getBean("student", Student.class);
        student.getStudentInfo();
        
        Worker worker = ctx.getBean("worker", Worker.class);
        worker.getWorkerInfo();
        
        ctx.close();
    }
}

3. Student.java

package com.java.ex3;
 
public class Student {
    private String name;
    private int age;
    private int gradeNum;
    private int classNum;
    
    public void getStudentInfo() {
        System.out.println("이름 : " + getName());
        System.out.println("나이 : " + getAge());
        System.out.println("학년 : " + getGradeNum());
        System.out.println("반 : " + getClassNum());
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public int getGradeNum() {
        return gradeNum;
    }
 
    public void setGradeNum(int gradeNum) {
        this.gradeNum = gradeNum;
    }
 
    public int getClassNum() {
        return classNum;
    }
 
    public void setClassNum(int classNum) {
        this.classNum = classNum;
    }
}

4. Worker.java

package com.java.ex3;
 
public class Worker {
    private String name;
    private int age;
    private String job;
    
    public void getWorkerInfo() {
        System.out.println("이름 : " + getName());
        System.out.println("나이 : " + getAge());
        System.out.println("직업 : " + getJob());
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public String getJob() {
        return job;
    }
 
    public void setJob(String job) {
        this.job = job;
    }
}

<?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.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">
 
    <aop:aspectj-autoproxy />
    <bean id="logAop" class="com.java.ex3.LogAop" />
    
    <bean id="student" class="com.java.ex3.Student">
        <property name="name" value="홍길동" />
        <property name="age" value="10" />
        <property name="gradeNum" value="3" />
        <property name="classNum" value="5" />
    </bean>
    
    <bean id="worker" class="com.java.ex3.Worker">
        <property name="name" value="홍길순" />
        <property name="age" value="35" />
        <property name="job" value="개발자" />
    </bean>
    
</beans>

*실행결과

=> 앞에 작성했던 XML 스키마 기반과 달리 @Aspect 어노테이션을 사용하여 AOP를 구현 하였다.

또 pointcut을 지정하기 위해 표현식으로 Aspectj 문법을 사용하였다.

 @Pointcut("bean(*ker)")        //~ker로 끝나는 빈에만 적용

    private void pointcutMethod() {

    }

ker로 끝나는 빈에만 적용을 지정하였기 떄문에 실행결과에서 Student 는 공통 기능(LogAop)이

적용되지 않았고 Worker 에만 적용이 된 모습을 확인할 수 있다.