코드를 통해 Spring ApplicationListener 구현을 등록하는 방법은 무엇입니까?

Question

스프링 ApplicationListener의 구현이 있습니다. 그것은 잘 작동하고 그것이 컨텍스트 XML 파일에서 콩으로 선언되거나 내가 @Component 주석을 사용하는 경우 이벤트를받습니다.

그러나 ConfigurableListableBeanFactory의 registerSingleton() 메서드를 사용하여 코드를 통해 수동으로 등록하면 이벤트가 수신되지 않습니다.

작동하는 경우와 작동하지 않는 경우를 설명하는 샘플 코드를 아래에 추가했습니다.

CustomEvent.java

package com.test.event; 

import org.springframework.context.ApplicationEvent; 

public class CustomEvent extends ApplicationEvent { 

    public CustomEvent(Object source) { 
     super(source); 
    } 

    public String toString() { 
     return "My Custom Event"; 
    } 
} 

CustomEventPublisher.java

package com.test.event; 

import org.springframework.context.ApplicationEventPublisher; 
import org.springframework.context.ApplicationEventPublisherAware; 

public class CustomEventPublisher implements ApplicationEventPublisherAware { 

    private ApplicationEventPublisher publisher; 

    public void setApplicationEventPublisher(ApplicationEventPublisher publisher) { 
     this.publisher = publisher; 
    } 

    public void publish() { 
     CustomEvent ce = new CustomEvent(this); 
     publisher.publishEvent(ce); 
    } 
} 

CustomEventHandler.java

package com.test.event; 

import org.springframework.context.ApplicationListener; 

public class CustomEventHandler 
    implements ApplicationListener<CustomEvent>{ 

    public void onApplicationEvent(CustomEvent event) { 
     System.out.println(event.toString()); 
    } 

} 

applicationContextWithListenerBean.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" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> 

    <bean id="customEventHandler" 
     class="com.test.event.CustomEventHandler"/> 

    <bean id="customEventPublisher" 
     class="com.test.event.CustomEventPublisher"/> 

</beans> 

applicationContextWithoutListenerBean.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" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> 

    <bean id="customEventPublisher" 
     class="com.test.event.CustomEventPublisher"/> 

</beans> 

MainApp.java

package com.test.event; 

import org.springframework.context.ConfigurableApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 

public class MainApp { 
    public static void main(String[] args){ 

     /* The below code works fine when listener bean customEventHandler is defined in xml */ 

     ConfigurableApplicationContext context = new ClassPathXmlApplicationContext(
       "applicationContextWithListenerBean.xml"); 
     CustomEventPublisher cvp = (CustomEventPublisher) context 
       .getBean("customEventPublisher"); 
     cvp.publish(); 
     context.close(); 

     /* The below code doesn't work when listener bean is registered through code. Is it possible to make this work? */ 

     ConfigurableApplicationContext context = new ClassPathXmlApplicationContext(
       "applicationContextWithoutListenerBean.xml"); 
     context.getBeanFactory().registerSingleton("customEventHandler", 
       new CustomEventHandler()); 
     CustomEventPublisher cvp = (CustomEventPublisher) context 
       .getBean("customEventPublisher"); 

     cvp.publish(); 
     context.close(); 
    } 
} 

은 코드를 통해 ApplicationListener를 등록 할 수 없습니다?

Answer 1

Bean을 싱글 톤으로 등록해도 ApplicationEvents에서 다시 호출 할 수 없습니다.

context.getBeanFactory().registerSingleton("customEventHandler", 
      new CustomEventHandler()); 

내가 ApplicationContext에 대한 참조를했습니다 ApplicationListeners