The Pocket Guide to building CQRS/Event Sourcing based applications using Axon

Vijay Nair and

Allard Buijze

Vijay Nair and

Allard Buijze

CQRS/Event Sourcings patterns are powerful patterns to help build enterprise applications.This pocket guide aims to help build applications based on the CQRS/ES pattern using the Axon Framework. It also demonstrates the usage of supporting patterns such as Event Modeling / DDD and Reactive Microservices

Vijay Nair and

Allard Buijze

PDF

EPUB

About

About the Book

The Command Query Responsibility Segregation Pattern is an architectural pattern to help build loosely coupled, modular, scalable, and event-based applications. It advocates the usage of two separate models within an application - one model for processing operations that validate and change state i.e. Commands, the other model for processing operations that query state i.e. Queries. The Event Sourcing pattern advocates the building of applications as a System of Events rather than as a System of State.

Both are extremely powerful patterns but at the same time very complex to implement due to the inherently distributed nature. Applications wanting to adopt these patterns would need to implement various infrastructural aspects which this pattern requires thereby introducing a lot of accidental complexity. It is better off to utilize tools that provide a robust implementation of the CQRS pattern freeing developers to do what they know best - implement business logic.

This book does exactly that. Taking a real-life application (Hotel Booking), we will build a complete CQRS and Event Sourcing based implementation utilizing the Axon Framework. Along the way, we will also see how to utilize supporting patterns such as Event Modeling / Domain Driven Design / Reactive Microservices. This book will also compare the approaches with other tools such as vLingo / Akka / Spring Boot and Event Store.

At the end of the book, you will have a complete working knowledge of the fundamentals of the CQRS pattern and its applicability to real-life projects

Share this book

Feedback

Email the Authors

Author

About the Authors

Vijay Nair

I am an event driven architectureal connoisseur and focus only on architectures centered around DDD / CQRS / Event Sourcing. I specialize in implementations around Axon / Eventuate and EventStore (Hey if you got a new event sourcing framework that I do not know please send it out to me - vijay.nair@practicalddd.com). I act as a platform architect for my day job, an independent evangelist for DDD/CQRS/ES and also am an InfoQ editor for the architectural and design streams. I am also the author of the book - Practical Domain Driven Design with Enterprise Java (Apress)

Allard Buijze

Allard Buijze is software architect at Trifork, which delivers software development, consultancy and training services to both national and international organizations. As an architect, he is responsible for the technical choices in his projects and investigates technologies for their potential in the diversity of projects Trifork does. For the last decade, he has been developing and designing enterprise applications for both large-scale and smaller projects. His focus has always been on clean application design, maintainability and testing. The training of co-developers is a very important part thereof.

Allard has given several trainings in the areas of scalable architectures, test driven development, application design and clean coding. He strongly believes that good craftsmanship can only be achieved through continuous and intensive exchange of experience with others.

The last years, he has been investigating and applying CQRS to a number of projects. As a result, he created the Axon Framework, an open source Java framework that helps developers create scalable and extensible applications by providing the building blocks that CQRS based infrastructures typically require. Axon has a growing community and has already been successfully introduced in several projects around the world.

The Leanpub 60 Day 100% Happiness Guarantee

Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.

Now, this is technically risky for us, since you'll have the book or course files either way. But we're so confident in our products and services, and in our authors and readers, that we're happy to offer a full money back guarantee for everything we sell.

You can only find out how good something is by trying it, and because of our 100% money back guarantee there's literally no risk to do so!

So, there's no reason not to click the Add to Cart button, is there?

See full terms...

Earn $8 on a $10 Purchase, and $16 on a $20 Purchase

We pay 80% royalties on purchases of $7.99 or more, and 80% royalties minus a 50 cent flat fee on purchases between $0.99 and $7.98. You earn $8 on a $10 sale, and $16 on a $20 sale. So, if we sell 5000 non-refunded copies of your book for $20, you'll earn $80,000.

(Yes, some authors have already earned much more than that on Leanpub.)

In fact, authors have earned over $14 million writing, publishing and selling on Leanpub.

Learn more about writing on Leanpub

Free Updates. DRM Free.

If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).

Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.

Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.

Learn more about Leanpub's ebook formats and where to read them

Write and Publish on Leanpub

You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!

Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.

Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.

Learn more about writing on Leanpub