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、

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

public interface MindReader {
  void interceptThoughts(String thoughts);

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

// <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" />

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

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

 1 // <start id="volunteer_java" />
 2 package com.springinaction.springidol;
 3 
 4 public class Volunteer implements Thinker {
 5   private String thoughts;
 6 
 7   public void thinkOfSomething(String thoughts) {
 8     this.thoughts = thoughts;
 9   }
10 
11   public String getThoughts() {
12     return thoughts;
13   }
14 }
15 // <end id="volunteer_java" />

5.sneaky-magician.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4  xmlns:aop="http://www.springframework.org/schema/aop"
 5  xsi:schemaLocation="http://www.springframework.org/schema/beans 
 6      http://www.springframework.org/schema/beans/spring-beans.xsd
 7      http://www.springframework.org/schema/aop
 8      http://www.springframework.org/schema/aop/spring-aop.xsd">
 9 
10   <bean id="volunteer" 
11       class="com.springinaction.springidol.Volunteer" />
12   <bean id="magician" 
13       class="com.springinaction.springidol.Magician" />
14   
15   <!-- <start id="aspectj_autoproxy" /> -->
16     <aop:aspectj-autoproxy />
17   <!-- <end id="aspectj_autoproxy" /> -->
18 
19 </beans>

 1 package com.springinaction.springidol;
 2 
 3 import static org.junit.Assert.*;
 4 
 5 import org.junit.Test;
 6 import org.junit.runner.RunWith;
 7 import org.springframework.beans.factory.annotation.Autowired;
 8 import org.springframework.test.context.ContextConfiguration;
 9 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
10 
11 @RunWith(SpringJUnit4ClassRunner.class)
12 @ContextConfiguration( { "sneaky-magician.xml" })
13 public class MindReaderTest {
14   @Autowired
15   MindReader magician;
16 
17   @Autowired
18   Thinker volunteer;
19 
20   // <start id="testMindReader" />
21   @Test
22   public void magicianShouldReadVolunteersMind() {
23     volunteer.thinkOfSomething("Queen of Hearts");
24 
25     assertEquals("Queen of Hearts", magician.getThoughts());
26   }
27   // <end id="testMindReader" />
28 }