Monday, November 02, 2015

Implementasi AOP dengan Spring

Dengan membuat kelas untuk Aspect yang sangat sederhana, misalnya :

package id.web.mige.wlsp.bbs;


import org.aspectj.lang.ProceedingJoinPoint;


public class SecurityAspect {
 
 
    public Object aroundFunction(ProceedingJoinPoint pjp) throws Throwable {
     System.out.println("Before " + pjp.getSignature().getName());
        Object retVal = pjp.proceed();
        System.out.println("After " + pjp.getSignature().getName());
        return retVal;
    }

}

Setting untuk AOP bisa di masukkan ke dalam berkas XML untuk servlet context, misalnya :


<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:aop="http://www.springframework.org/schema/aop"
 xmlns:beans="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
  http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/aop 
      http://www.springframework.org/schema/aop/spring-aop.xsd">

 <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
 
 <!-- Enables the Spring MVC @Controller programming model -->
 <annotation-driven />

 <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
 <resources mapping="/resources/**" location="/resources/" />

 <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
 <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <beans:property name="prefix" value="/WEB-INF/views/" />
  <beans:property name="suffix" value=".jsp" />
 </beans:bean>
 
  <context:component-scan base-package="id.web.mige.wlsp.bbs" />
 
    <beans:bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
      <beans:property name="jndiName" value="jdbc/localtestdb"/>
    </beans:bean>
 
    <beans:bean id="articleJDBCTemplate" 
       class="id.web.mige.wlsp.bbs.ArticleJDBCTemplate">
       <beans:property name="dataSource"  ref="dataSource" />    
    </beans:bean>
           <aop:aspectj-autoproxy/>
    
    <beans:bean id="articleController" class="id.web.mige.wlsp.bbs.ArticleController"/>
    
    <beans:bean id="myAspect" class="id.web.mige.wlsp.bbs.SecurityAspect">
     <!-- configure properties of aspect here as normal -->
  </beans:bean>
  
  <aop:config proxy-target-class="true">
        <aop:aspect ref="myAspect">

            <aop:pointcut id="mypointcut"
                expression="execution(* id.web.mige.wlsp.bbs.ArticleController.*(..))"/>

            <aop:around pointcut-ref="mypointcut"
                method="aroundFunction"/>  
   
   
   

        </aop:aspect>
     </aop:config>
  
</beans:beans> 

Atau jika lebih menyukai bentuk annotation, kelas Aspect dapat diubah menjadi seperti ini :

@Aspect
public class SecurityAspect {
 
 @Around("execution(* id.web.mige.wlsp.bbs.ArticleController.*(..))")
    public Object aroundFunction(ProceedingJoinPoint pjp) throws Throwable {
     System.out.println("Before " + pjp.getSignature().getName());
        Object retVal = pjp.proceed();
        System.out.println("After " + pjp.getSignature().getName());
        return retVal;
    }

}

dan setting/config XML untuk tag <aop:aspect ... > ...  </aop:aspect> dapat dihilangkan.
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