Implements ApplicationListener : ApplicationContext « Spring « Java Tutorial

1. Java Tutorial
2. Spring
3. ApplicationContext

File: context.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
    "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

  <bean id="heartbeatTask" class="HeartbeatTask"/>
  
  <bean id="scheduledTask" class="org.springframework.scheduling.timer.ScheduledTimerTask">
    <property name="timerTask"><ref local="heartbeatTask"/></property>
    <property name="period"><value>1000</value></property>
  </bean>

  <bean id="timerFactory" class="org.springframework.scheduling.timer.TimerFactoryBean">
    <property name="scheduledTimerTasks">
      <list>
        <ref local="scheduledTask"/>
      </list>
    </property>
  </bean>
  
  <bean id="heartbeatForwarder" class="HeartbeatForwarder"/>

</beans>

File: Main.java

import java.util.TimerTask;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
  public static void main(String args[]) throws Exception {

    ApplicationContext ctx = new ClassPathXmlApplicationContext("context.xml");
    Thread.sleep(30 * 1000);

  }
}

class HeartbeatTask extends TimerTask implements ApplicationEventPublisherAware {

  private ApplicationEventPublisher eventPublisher;

  public void run() {
    HeartbeatEvent event = new HeartbeatEvent(this);
    eventPublisher.publishEvent(event);
  }

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

class HeartbeatForwarder implements ApplicationListener {
  public void onApplicationEvent(ApplicationEvent event) {
    if (event instanceof HeartbeatEvent) {
      System.out.println("Received heartbeat event: " + event.getTimestamp());
    }
  }
}

class HeartbeatEvent extends ApplicationEvent {
  public HeartbeatEvent(Object source) {
    super(source);
  }
}

28.2.ApplicationContext
	28.2.1.	ApplicationContext component scan
	28.2.2.	Component Filter Assignable
	28.2.3.	Search By Base Package
	28.2.4.	Implements ApplicationListener
	28.2.5.	Implements ApplicationEvent Publisher Aware
	28.2.6.	Filter By Annotation
	28.2.7.	ApplicationContext Aware
	28.2.8.	ApplicationContext And BeanFactory PostProcessor