Use events in SAP Hybris

1. Overview

Events are used in Hybris to play tasks that are :

• Low priority task.
• Task takes long time to run.
• Task to be run in a separated thread from the main thread.

For example : send emails, persist logging data, save audit data…

This is a amplified overview of how the events mechanism work in Hybris.

• EventService : Publish event using publishEvent(event) method.
• EventListener : Receive event and run logic defined inside onEvent(event) method.
• Event : Hold the necessary data to be passed to the EventListener.

In this article, I will show you how to use events in Hybris (create, publish and consume).

2. Implementation

2.1. Create Event

First create a class extends AbstractEvent, that will hold all the data to be passed to the EventListener.

package com.stackextend.training.core.event;

import de.hybris.platform.servicelayer.event.events.AbstractEvent;

public class HelloWorldEvent extends AbstractEvent {
    
    private String fullName;
    
    public HelloWorldEvent(String fullName) {
        this.fullName = fullName;
    }

    public String getFullName() {
        return fullName;
    }
}

2.2. Create EventListener

Create a HelloWorldEventListener extends AbstractEventListener, and add business logic inside the onEvent(event) method.

package com.stackextend.training.core.event.listener;

import com.stackextend.training.core.event.HelloWorldEvent;
import de.hybris.platform.servicelayer.event.impl.AbstractEventListener;

public class HelloWorldEventListener extends AbstractEventListener<HelloWorldEvent> {
    
    @Override
    protected void onEvent(HelloWorldEvent helloWorldEvent) {
        
        String fullName = helloWorldEvent.getFullName();
        
        System.out.println("Hello " + fullName);
    }
    
}

Register the HelloWorldEventListener as a Spring bean.

<!-- ...\hybris\bin\custom\training\trainingcore\resources\trainingcore-spring.xml -->

<bean id="helloWorldEventListener"
	  class="com.stackextend.training.core.event.listener.HelloWorldEventListener"
	  parent="abstractSiteEventListener">

	<!-- inject beans here if it's needed -->

</bean>

2.3. Publish Event

Publishing the event is simple, you need just to call the eventService.publishEvent(event) with an instance of HelloWorldEvent.

@Autowired
private EventService eventService;

// create HelloWorldEvent instance
HelloWorldEvent event = new HelloWorldEvent("Mouad EL Fakir");

// Publish the event
eventService.publishEvent(event);

Refer to this article for an example on how to publish this event using Groovy script.

If everything goes well the HelloWorldEventListener will receive the event and display the Hello Mouad EL Fakir.

Mouad EL Fakir

Software Craftsmanship, Stackextend author and Full Stack developer with 6+ years of experience in Java/Kotlin, Java EE, Angular and Hybris…
I’m Passionate about Microservice architectures, Hexagonal architecture, Event Driven architecture, Event Sourcing and Domain Driven design (DDD)…
Huge fan of Clean Code school, SOLID, GRASP principles, Design Patterns, TDD and BDD.