Spring - AOP 코드 구현하기

AOP 코드 구현하기

package Spring.aop.entity;

public class NewlecExam implements Exam{
	private int kor;
    private int eng;
    private int math;
    private int com;
    
    public NewlecExam() {
    }
    
    public NewlecExam(int kor, int eng, int math, int com){
    	this.kor  = kor;
        this.eng  = eng;
        this.math = math;
        this.com  = com;
    }
    
    public void setKor(int kor){
    	this.kor = kor;
    }
    
    public void getKor(){
    	return kor;
    }
    
    public void setEng(int eng){
    	this.eng = eng;
    }
    
    public void getEng(){
    	return eng;
    }
    
    public void setMath(int math){
    	this.math = math;
    }
    
    public void getMath(){
    	return math;
    }
    
    public void setCom(int com){
    	this.com = com;
    }
    
    public void getCom(){
    	return com;
    }
    
    @Override
    public int total(){
    	int result = kor+eng+math+com;
        
        return result;
    }
    
    @Override
    public avg(){
    	float result = total() / 4.0f;
        
        return result;
    }
    
    @Override
    public String toString(){
    	return "NewlecExam [kor=" + kor + ", eng=" 
        + eng + ", math=" + math + ",com = com" + com];
    }
}

package spring.aop;

import Spring.aop.entity.Exam;
import spring.aop.entity.NewlecExam;

public class Program{
	public static void main (String[] args)
    {
    	Exam exam = new NewlecExam(1,1,1,1);
        
        /*
        Exam proxy = Proxy.newProxyInstance(
        loader
        , interfaces
        , h) 양식으로 기입한다.
        */
        
        Exam proxy = (Exam)Proxy.newProxyInstance(
        NewlecExam.class.getClassLoader() 
        , new Class[]{Exam.class}
        , new InvocationHandler(){
        		
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) 
            throws Throwable 
            {
                
                 long start = System.currentTimeMillis();
                 /*-----------------------*/
                 
                 Object result = method.invoke(exam, args);
                 
                 /*-----------------------*/
                 long end = System.currentTimeMillis();
                 String message = (end - start) + "ms 시간이 걸렸습니다.";
                 
                 System.out.println(message);
                 
                
        		 return result;
        	}
        };
        );
        
        System.out.printf("total is %d \n", proxy.total());
        System.out.printf("total is %d \n", exam.total());
    }
}

실행결과

201ms 시간이 걸렸습니다.
total is 4

total is 4