Source Code : Message Event

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Message Event

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/



///////////////////////////////////////////////////////////////////////////////////////
//File: events.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="publisher" class="Publisher"/>
        <bean id="messageEventListener" class="MessageEventListener"/>
</beans>



///////////////////////////////////////////////////////////////////////////////////////

import org.springframework.context.ApplicationEvent;


public class MessageEvent extends ApplicationEvent {

    private String msg;
    public MessageEvent(Object source, String msg) {
        super(source);
        this.msg = msg;
    }
    
    public String getMessage() {
        return msg;
    }
    
}

///////////////////////////////////////////////////////////////////////////////////////

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;

public class MessageEventListener implements ApplicationListener {

   
    public void onApplicationEvent(ApplicationEvent event) {
       if(event instanceof MessageEvent) {
           MessageEvent msgEvt = (MessageEvent)event;
           System.out.println("Received: " + msgEvt.getMessage());
       }
    }

}

///////////////////////////////////////////////////////////////////////////////////////


import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class Publisher implements ApplicationContextAware {

    private ApplicationContext ctx;

    public static void main(String[] args) {
        ApplicationContext ctx = new FileSystemXmlApplicationContext(
                "build/events.xml");

        Publisher pub = (Publisher) ctx.getBean("publisher");
        pub.publish("Hello World!");
        pub.publish("The quick brown fox jumped over the lazy dog");
    }

    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        this.ctx = applicationContext;

    }

    public void publish(String message) {
        ctx.publishEvent(new MessageEvent(this, message));
    }
}

           
       

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