Deep dive into event-driven microservices

We are pleased to invite you to a three-part event.

During the meetup, we will focus on how concepts such as DDD, CQRS, and event sourcing help us to manage complex systems.

This will be led by Allard Buijze, CTO from AxonIQ. These sessions will give you the opportunity to learn about the latest concepts and techniques for building complicated, scalable software systems and test them out yourself.

Designing Microservices with Axon - Modeling and Coding Workshop
With Allard Buijze

This workshop contains three parts:

Part 1: Introduction to architectural concepts

Domain-driven design (DDD) is a software design approach focusing on modeling systems based on input from business domain experts.

In this part, we will discuss what a domain and the model(s) within that domain are. We will cover the concept of bounded contexts and the importance of ubiquitous language for better communication. We will also look at building blocks within a domain model, including aggregates, events, value objects, and repositories.

We will also talk about Command-Query Responsibility Separation (CQRS) and the advantages of separating the business logic (command side) from the projections (query side) in an application. We will then explain how these two parts become parts of the same conceptual application through a client or UI. And lastly, how the events (notification of something that has happened in the past) can update both the command and query sides. We will discuss how event sourcing is the way to elevate events from side effects to a core element.

Part 2: Discovery phase through event modeling

Event modeling is a method of describing a system by looking at how the information changes over time. This practice omits the transient changes and looks at what is being stored and what the user sees at any time. We will look at the four patterns and seven steps of event modeling and model a sample application together.

Part 3: Hands-on coding

In this final portion, we will translate our event model into code (using your IDE of choice); the download information for a basic application will be provided. After a simple setup, we will continue using DDD's building blocks to expand our application further by applying the concepts of CQRS and event sourcing. Once completed, we will run the application locally with Axon Server as the event store and messaging platform, and if time permits, we can even look at scaling options.

What should you bring to the workshop?

- A laptop

- An IDE that supports Maven, Java and Kotlin

- Basic knowledge of Java

The event is free of charge.

There will be food and drinks.

PS: For everybody that can't make it to the workshop but would still like to butt some heads in a more informal way, join us at the hangout shortly after! -> DDD-Hangout