[오라클자바개발자실무교육,오엔제이프로그래밍실무교육센터,spring framework3.X강좌]Spring AOP DynamicMethodMatcherPointcut

Spring AOP DynamicMethodMatcherPointcut

DynamicMethodMatcherPointcut에서 충고가 적용되는 메소드는 모든 메소드를 검사하는 초기화 단계, 메소드가 처음 호출되는 시점에 걸쳐 두 번의 정적 검사를 받게 된다.  이 처럼 동적 포인트 컷은 정적 포인트 컷 보다 유연하게 적용될 수 있지만 성능 부담을 고려해 필요한 경우만 사용해야 한다.

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아래예제는 First.java의 one 메소드에만 충고(Advice)가 적용되는 예제 입니다.

[First.java]package onj.edu.aop2;

public class First {

       public void one(int i) {

             System.out.println("First One... i = " + i);

       }

       public void two() {

             System.out.println("First Two...");

       }

} 

}

[SimpleAdvice.java]
package onj.edu.aop2;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

public class SimpleAdvice implements MethodInterceptor {

           public Object invoke(MethodInvocation invocation) throws Throwable {

                     System.out.println(invocation.getMethod().getName());

                    

                     Object o = invocation.proceed();

                     System.out.println("... SimpleAdvice의 충고가 적용됨 ...");

                    

                     return o;

           }

}

[SimpleDynamicPointcut.java]package onj.edu.aop2;

import java.lang.reflect.Method;

import org.springframework.aop.ClassFilter;

import org.springframework.aop.support.DynamicMethodMatcherPointcut;

/* DynamicMethodMatcherPointcut은

 * matches(Method method, Class<?> cls, Object[] args) 반드시 구현해야함

 * 정적체크를 위해서는 matches(Method method, Class<?> cls)도 같이 구현해야 한다.

 */

public class SimpleDynamicPointcut extends DynamicMethodMatcherPointcut {

      

       //메소드 이름이 one 인 경우 true 즉 충고가 주입된다.아래는 정적체크   

       //스프린은 two  메소드에 대해서는 동적 검사를 진행안함

       public boolean matches(Method method, Class<?> cls) {

             System.out.println("static check :: method.getName() :: " + method.getName());

             return "one".equals(method.getName());

       }

      

       //아래 메소드는 동적검사

       public boolean matches(Method method, Class<?> cls, Object[] args) {

             System.out.println("dynamic Check :: " + ((Integer)args[0]).intValue());

            

             int i = ((Integer)args[0]).intValue();

             return i > 100;

       }

      

       // First.class만 충고가 주입된다.

       public ClassFilter getClassFilter() {

             return new ClassFilter() {

                    public boolean matches(Class <?> cls) {

                           return (cls == First.class);

                    }

             };

       }

}

[DynamicPointcutExam.java]

package onj.edu.aop2;

import org.springframework.aop.Advisor;

import org.springframework.aop.framework.ProxyFactory;

import org.springframework.aop.support.DefaultPointcutAdvisor;

public class DynamicPointcutExam {

       public static void main(String[] args) {

             First target = new First();

            

             //어드바이저 생성

             Advisor advisor = new DefaultPointcutAdvisor(new SimpleDynamicPointcut(), new SimpleAdvice());

            

             ProxyFactory pf = new ProxyFactory();

             pf.setTarget(target);

             pf.addAdvisor(advisor);

             First proxy = (First)pf.getProxy();

            

             proxy.one(99);

             proxy.one(101);

             proxy.two();

            

       }

}

[결과]static check :: method.getName() :: one

static check :: method.getName() :: two

static check :: method.getName() :: clone

static check :: method.getName() :: toString

static check :: method.getName() :: one

dynamic Check :: 99

First One... i = 99

dynamic Check :: 101

one

First One... i = 101

... SimpleAdvice의 충고가 적용됨 ...

static check :: method.getName() :: two

First Two...

[출처] 오라클자바커뮤니티 - http://www.onjprogramming.co.kr/oraclejavanew/oraclejava/bbs/board.php?bo_table=LecSpring&wr_id=215