Spring : AOP with Java Config - @Pointcut annotation

0. 이 포스트는 Spring : AOP with Java Config 시리즈의 연속이다.

1. @Pointcut annotation의 목적은 하나의 point cut expression을 여러 advice 메소드에서 사용하기 위한 것이다.

  1-1 즉 여러 개의 advice 메소드를 동일한 조건에서 사용할 경우에 중복을 제거하기 위함이다.

  1-2 장점을 나열해 보면 쉬운 재사용, 한 곳에서 수정할 수 있음, 여러 포인트 컷의 공유와 조합이 편리함

 

2. @Pointcut 메소드를 정의한다.

  2-1 아래의 코드의 forDAOPackage메소드는 @Pointcut으로 수식되어 있다.

  2-2 단순히 point cut expression의 중복을 줄이기 위해서 사용하였다.

  2-3 아래 소스는 예전의 소스와 동일하다.

  2-4 결과는 이전과 동일하다.

@Aspect
@Component
public class LoggingAspect {

//  @Before(value = "execution(public void addAccount())")
//  @Before(value = "execution(public void add*())")
//  @Before(value="execution(boolean add*())")
//  @Before(value="execution(* add*())")
//  @Before(value="execution(* add*(pe.pilseong.spring_aop_review.Account))")
//  @Before(value="execution(* add*(pe.pilseong.spring_aop_review.Account, ..))")
//  @Before(value="execution(* add*(..))")
//  @Before("execution(* pe.pilseong.spring_aop_review.dao.*.*(..))")
//  public void beforeAddAccountAdvice() {
//    System.out.println("\nExecuting @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)");
//  }
  

  @Pointcut(value = "execution(* pe.pilseong.spring_aop_review.dao.*.*(..))")
  public void forDAOPackage() {}
  
  @Before(value = "forDAOPackage()")
  public void beforeAddAccountAdvice() {
    System.out.println("\nExecuting @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)");
  }
}

// 실행 클래스
public class App {
  public static void main(String[] args) {
    AnnotationConfigApplicationContext context = 
        new AnnotationConfigApplicationContext(JavaConfig.class);
    
    AccountDAO accountDAO = context.getBean("accountDAO", AccountDAO.class);
    accountDAO.addAccount();
    
    Account account = new Account();
    accountDAO.addAccount(account);
    
    accountDAO.addAccount(account, true);
    
    MembershipDAO membershipDAO = context.getBean("membershipDAO", MembershipDAO.class);
    
    membershipDAO.addAccount();
    membershipDAO.addGoodAccount();
    membershipDAO.membership();
    
    context.close();
  }
}

// 실행 결과

Executing @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
in beforeAddAccountAdvice
class pe.pilseong.spring_aop_review.dao.AccountDAO: with Account Parameter. Doing my DB work: Adding an account



Executing @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
in beforeAddAccountAdvice
class pe.pilseong.spring_aop_review.dao.AccountDAO: with Account, boolean Parameter. Doing my DB work: Adding an account


Executing @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
in beforeAddAccountAdvice
class pe.pilseong.spring_aop_review.dao.MembershipDAO: Doing my DB work: Adding an account



Executing @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
in beforeAddAccountAdvice
class pe.pilseong.spring_aop_review.dao.MembershipDAO: Doing my DB work: Adding a good account



Executing @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
in beforeAddAccountAdvice
class pe.pilseong.spring_aop_review.dao.MembershipDAO: Doing my DB work: membership method is doing something 

3. 동일한 @Pointcut을 사용하는 다른 메소드를 Advice에서 정의한다.

  3-1 패키지에 포함된 메소드가 호출될 때 두 advice메소드가 차례로 실행된다.

@Aspect
@Component
public class LoggingAspect {
  @Pointcut(value = "execution(* pe.pilseong.spring_aop_review.dao.*.*(..))")
  public void forDAOPackage() {}
  
  @Before(value = "forDAOPackage()")
  public void beforeAddAccountAdvice() {
    System.out.println("\nExecuting in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)");
  }
  
  @Before(value = "forDAOPackage()")
  public void performApiAnalytics() {
    System.out.println("\nExecuting in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)");
  }
}

// 실행 결과


Executing in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)

Executing in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
class pe.pilseong.spring_aop_review.dao.AccountDAO: with No Parameter Doing my DB work: Adding an account



Executing in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)

Executing in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
class pe.pilseong.spring_aop_review.dao.AccountDAO: with Account Parameter. Doing my DB work: Adding an account



Executing in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)

Executing in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
class pe.pilseong.spring_aop_review.dao.AccountDAO: with Account, boolean Parameter. Doing my DB work: Adding an account


Executing in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)

Executing in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
class pe.pilseong.spring_aop_review.dao.MembershipDAO: Doing my DB work: Adding an account



Executing in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)

Executing in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
class pe.pilseong.spring_aop_review.dao.MembershipDAO: Doing my DB work: Adding a good account



Executing in beforeAddAccountAdvice @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)

Executing in performApiAnalytics @Before advice on pe.pilseong.spring_aop_review.dao.*.*(..)
class pe.pilseong.spring_aop_review.dao.MembershipDAO: Doing my DB work: membership method is doing something