[記事] Spring AOP

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呃...吃太多, 有點消化不良, 先吐一點出來, 晚點在反芻... orz

1. Create a interface
package com.cht.domain;

public interface IWorker {

  public void work(String thing);
  public void sayHello(String who);

}


2. implement it
package com.cht.domain;

public class Employee implements IWorker{
  @Override
  public void work(String thing) {
    System.out.println("\tDo " + thing);
  }

  @Override
  public void sayHello(String who) {
    System.out.println("\tHi, " + who);
  }
}


3. write the aspect config bean
package com.cht.domain;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class AspectConfigBean {

  @Pointcut("execution(* com.cht.domain.Employee.*(..))")
  public void doIt() {
    System.out.println("wwwwwwwwwhat!");
  }

  @Before("doIt()")
  public void beforeExec(){
    System.out.println("Before All function call...");
  }

  @Before("execution(* com.cht.domain.Employee.sayHello(..))")
  public void beforeAgain(JoinPoint point){
    System.out.println("Before Employee.sayHello");
  }

  @After("doIt()")
  public void afterAll(JoinPoint point) {
    System.out.println("All after "+ point.getSignature().getName());
  }

  @After("execution(* com.cht.domain.Employee.work(..))")
  public void afterExecWork(JoinPoint point){
    System.out.println("after "+ point.getSignature().getName());
  }

  @After("execution(* com.cht.domain.Employee.sayHello(..))")
  public void afterExecSayHello(JoinPoint point ){
    System.out.println("after "+ point.getSignature().getName());
  }

  @Around("execution(* com.cht.domain.Employee.*(..))")
  public void aroundAdvice(ProceedingJoinPoint point){
    System.out.println(point.getSignature().getName() + " proceeding...");
    try {
      point.proceed();
    } catch (Throwable e) {
      e.printStackTrace();
    }
  }
}


4. define them in the application context xml

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<aop:aspectj -autoproxy="-autoproxy" />

<bean class="com.cht.domain.Employee" id="employee" />
<bean class="com.cht.domain.AspectConfigBean" id="aspectBean" />
</beans>

5. test
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.cht.domain.IWorker;

public class TESTAOP {

  public static void main(String[] args) {
    ApplicationContext context =
      new ClassPathXmlApplicationContext("spring-aop.xml");

    IWorker worker = (IWorker) context.getBean("employee");

    worker.sayHello("Samuel");

    worker.work("programming");
  }
}