SPRING IN ACTION 第4版笔记-第四章ASPECT-ORIENTED SPRING-009-带参数的ADVICE2

一、

情景：有个魔术师会读心术，常人一想一事物他就能读到。以魔术师为切面织入常人的内心。

二、

1.

// <start id="mindreader_java" />
package com.springinaction.springidol;

public interface MindReader {
  void interceptThoughts(String thoughts);

  String getThoughts();
}
// <end id="mindreader_java" />

2.

// <start id="magician_java" />
package com.springinaction.springidol;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class Magician implements MindReader {
  private String thoughts;

  @Pointcut("execution(* com.springinaction.springidol." //<co id="co_parameterizedPointcut"/>
      + "Thinker.thinkOfSomething(String)) && args(thoughts)")
  public void thinking(String thoughts) {
  }

  @Before("thinking(thoughts)") //<co id="co_passInParameters"/>
  public void interceptThoughts(String thoughts) {
    System.out.println("Intercepting volunteer's thoughts : " + thoughts);
    this.thoughts = thoughts;
  }

  public String getThoughts() {
    return thoughts;
  }
}
// <end id="magician_java" />

3.

// <start id="thinker_java" />
package com.springinaction.springidol;

public interface Thinker {
  void thinkOfSomething(String thoughts);
}
// <end id="thinker_java" />

4.

 // <start id="volunteer_java" />
 package com.springinaction.springidol;

 public class Volunteer implements Thinker {
   private String thoughts;

   public void thinkOfSomething(String thoughts) {
     this.thoughts = thoughts;
   }

   public String getThoughts() {
     return thoughts;
   }
 }
 // <end id="volunteer_java" />

5.sneaky-magician.xml

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

   <bean id="volunteer"
       class="com.springinaction.springidol.Volunteer" />
   <bean id="magician"
       class="com.springinaction.springidol.Magician" />

   <!-- <start id="aspectj_autoproxy" /> -->
     <aop:aspectj-autoproxy />
   <!-- <end id="aspectj_autoproxy" /> -->

 </beans>

6.

 package com.springinaction.springidol;

 import static org.junit.Assert.*;

 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration( { "sneaky-magician.xml" })
 public class MindReaderTest {
   @Autowired
   MindReader magician;

   @Autowired
   Thinker volunteer;

   // <start id="testMindReader" />
   @Test
   public void magicianShouldReadVolunteersMind() {
     volunteer.thinkOfSomething("Queen of Hearts");

     assertEquals("Queen of Hearts", magician.getThoughts());
   }
   // <end id="testMindReader" />
 }