Custom Events in Spring | Spring Custom Events | Spring event handling

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Custom Events in Spring | Spring Custom Events | Spring event handling

Custom Events in Spring | Spring Custom Events | Spring event handling

Custom Events in Spring | Spring Custom Events | Spring event handling

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0%20http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.2.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Spring 5 dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>
</project>

CustomEvent.java

package com.ram.events;

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.ram.eventpublisher;

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

import com.ram.events.CustomEvent;

public class CustomEventPublisher implements ApplicationEventPublisherAware
{
    private ApplicationEventPublisher publisher;

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

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

CustomEventHandler.java

package com.ram.eventhand
ler;

import org.springframework.context.ApplicationListener;

import com.ram.events.CustomEvent;

public class CustomEventHandler implements ApplicationListener<CustomEvent>
{
    public void onApplicationEvent(CustomEvent event)
    {
        System.out.println("Received custom event = "+event.toString());
    }
}

applicationContext.xml

<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-4.3.xsd">

    <bean id="customEventHandler" class=" com.ram.eventhandler.CustomEventHandler" />
    <bean id="customEventPublisher" class="com.ram.eventpublisher.CustomEventPublisher" />

</beans>

App.java

package com.ram.core;

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

import com.ram.eventpublisher.CustomEventPublisher;

public class App
{
    public static void main(String[] args)
    {
        ConfigurableApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        CustomEventPublisher customEventPublisher = (CustomEventPublisher) context
                .getBean("customEventPublisher");

        customEventPublisher.publish();
        customEventPublisher.publish();
    }

}

Output

Aug 28, 2018 10:28:25 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@610694f1: startup date [Tue Aug 28 10:28:25 IST 2018]; root of context hierarchy
Aug 28, 2018 10:28:25 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
Received custom event = My Custom Event
Received custom event = My Custom Event

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_Custom_Events.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_Custom_Events

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/02e04aa1b68a77d4f5a01ebf111e80370bd99ca8/Spring_2018/SpringDemo_Custom_Events/?at=master

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