Spring : AOP with Java Config - @After

0. 이 포스트는 Spring : AOP with Java Config의 연속이다.

 

1. @After advice는 타겟 메소드에서 Exception의 발생여부과 관계없이 실행된다.

  1-1 실행시점은 @AfterReturning 이나 @AfterThrowing advice가 실행되기 직전에 실행된다.

  1-2 @After advice는 에러에 대한 접근이 불가능하다.

    1-2-1 예외 관련 처리가 필요하면 @AfterThrowing을 추가로 구현해야 한다.

 

2. 사용 용도는

  2-1 예외 로그를 남기거나 감사를 업무수행

  2-2 결과 관계없이 처리해야 하는 리소스 해제 같은 로직 수행

 

3. @After는 @AfterReturning, @AfterThrowing과 같이 실행해야 동작을 확인할 수 있어 추가된 부분만 붙여넣기 한다.

@Aspect
@Component
public class LoggingAspect {

  @AfterThrowing(pointcut = "execution(* pe.pilseong.aop_after_returning.dao.AccountDAO.findAccounts(..))", throwing = "ex")
  public void afterThrowingFindAccountsAdvice(JoinPoint joinPoint, Throwable ex) {
    System.out.println("Aspect(@AfterThrowing) :: afterThrowingFindAccountsAdvice is executed after "
        + joinPoint.getSignature().toShortString());
  }

  @AfterReturning(pointcut = "execution(* pe.pilseong.aop_after_returning.dao.AccountDAO.findAccounts(..))")
  public void afterReturningFindAccountsAdvice(JoinPoint joinPoint) {
    System.out.println("Aspect(@AfterReturning) :: afterReturningFindAccountsAdvice is executed after "
        + joinPoint.getSignature().toShortString());
  }
  
  @After(value = "execution(* pe.pilseong.aop_after_returning.dao.AccountDAO.findAccounts(..))")
  public void afterFindAccountsAdvice(JoinPoint joinPoint) {
    System.out.println("Aspect(@After) :: afterReturningFindAccountsAdvice is executed after "
        + joinPoint.getSignature().toShortString());
  }

4. 실행 결과

  4-1 결과를 보면 예외의 발생 여부와 상관없이 @After advice가 실행된 것을 확인 할 수 있다.

public class App {
  public static void main(String[] args) {
    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(JavaConfig.class);

    AccountDAO accountDAO = context.getBean("accountDAO", AccountDAO.class);

    List<Account> accounts = null;
    try {
      boolean triggerError = true;
      accounts = accountDAO.findAccounts(triggerError);
    } catch (Exception e) {
      System.out.println("Main App class :: " + e.getMessage());
    }

    System.out.println("\nMain App class :: ");
    System.out.println("Main App class Accounts List :: " + accounts);

    context.close();
  }
}

// triggerError가 true로 예외를 발생시킨 경우
findAccounts is executed
Aspect(@After) :: afterReturningFindAccountsAdvice is executed after AccountDAO.findAccounts(..)
Aspect(@AfterThrowing) :: afterThrowingFindAccountsAdvice is executed after AccountDAO.findAccounts(..)
Main App class :: Exception :: To trigger @AfterThrowing

Main App class :: 
Main App class Accounts List :: null

---------------------------------------------------------------------------

// triggerError가 false인 정상 경로 실행의 경우
findAccounts is executed
Aspect(@After) :: afterReturningFindAccountsAdvice is executed after AccountDAO.findAccounts(..)
Aspect(@AfterReturning) :: afterReturningFindAccountsAdvice is executed after AccountDAO.findAccounts(..)

Main App class :: 
Main App class Accounts List :: [Account [name=Pilseong, level=Admin], Account [name=Suel, level=Admin], Account [name=Noel, level=Staff]]