events-sourcing

• Events-sourcing is a library used to generate and send events for a Spring application.
• Hibernate Domain events are automatically sent when an entity is persisted (or deleted).

Howto

Maven

mvn clean install

then in the project

<dependency>
  <groupId>com.github.willome</groupId>
  <artifactId>events-sourcing</artifactId>
  <version>1.0.0-SNAPSHOT</version>
</dependency>

Spring (boot) configuration

@ComponentScan({"com.axione.events.sourcing"})

EventPublisher

Define a new EventPublisher :

@Service
public MyEventPublisher implements EventPublisher {}

liquibase

<?xml version="1.1" encoding="UTF-8" standalone="no"?>
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog" xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.5.xsd">

   	<include file="liquibase-events-sourcing-changelog-1.0.xml" />

</databaseChangeLog>

Sending a custom Event

• crate a new Event implements AggregateEvent with In, an Object
• create a new factory implements AggregateEventFactory<In, Out> with In, an object & Out, the reponse. Annotate with @Service.
• Inject ApplicationEventPublisher applicationEventPublisher
• call applicationEventPublisher.publish(factory.newEvent(In));

Domain models events

• crate a new Event implements AggregateEvent with In, an Entity
• create a new factory implements AggregateEventFactory<In, Out> with In, an Entity & Out, the reponse. Annotate with @SaveDomainEvent
• each save/update on db will automatically publish the event.