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" />
}