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Architecture & Design Follow 2411 Followers

Axon Conference Panel: Why Should We Use Microservices?

by Jan Stenberg Follow 37 Followers on  Sep 28, 2018

In the panel discussion at the recent Event-Driven Microservices Conference in Amsterdam, Frans van Buul from AxonIQ, the conference organizer, started by noting that microservices are quite mainstream today. He wanted to look back at what we have learned, but also think about where we will be heading in the next couple of years.

Architecture & Design Follow 2411 Followers

Basic Concepts and the Future of Axon, a CQRS and Event Sourcing Framework

by Jan Stenberg Follow 37 Followers on  Sep 27, 2018

At the recent Event-Driven Microservices Conference in Amsterdam, Allard Buijze described in a presentation the basic concepts, the history and future of Axon, a framework for systems based on DDD, event sourcing and CQRS. The adoption of Axon Framework is growing rapidly and recently hit one million downloads.

Architecture & Design Follow 2411 Followers

Axon Framework 3.3 with a Subscription Query API and Kafka Support

by Jan Stenberg Follow 37 Followers on  Jul 19, 2018

Version 3.3 of the Axon framework was recently released with a subscription query API for subscribing to query model updates, a manager for scheduling the publishing of deadline messages, and an Axon-Kafka module allowing for the use of Kafka to send and receive events. An updated version, 3.3.2, has also been released, and for those on version 3.3 an upgrade is strongly recommended.

Architecture & Design Follow 2411 Followers

Sharing Experiences from a Microservices Journey

by Mark Little Follow 14 Followers on  Dec 04, 2016

In our continued effort to showcase lessons learned by microservices practitioners, we look at an article Piotr Gankiewicz has recently written with his own tips and tricks. These include references to CQRS, asynchronous architectures, service discovery and how choosing the right database for each service is important.

Architecture & Design Follow 2411 Followers

Comparison of Event Sourcing with Stream Processing

by Jan Stenberg Follow 37 Followers on  May 25, 2016

Event sourcing and CQRS are two patterns that has emerged in the Domain-Driven Design (DDD) community. Stream processing builds on similar ideas but has emerged in a different community, Martin Kleppmann noted in his presentation at the Domain-Driven Design Europe conference earlier this year comparing event sourcing with stream processing.

Architecture & Design Follow 2411 Followers

A Whole System Based on Event Sourcing is an Anti-Pattern

by Jan Stenberg Follow 37 Followers on  Apr 26, 2016 5

Command Query Responsibility Segregation (CQRS) was never meant to be the end goal of what we are trying to achieve, it is a stepping stone towards the ideas of Event sourcing, Greg Young stated in his presentation at the Domain-Driven Design Europe conference earlier this year. He noted though that just applying CQRS is still a valuable pattern.

Architecture & Design Follow 2411 Followers

CQRS Example Using Axon Framework

by Jan Stenberg Follow 37 Followers on  Jan 31, 2016

Command Query Responsibility Segregation (CQRS) separates the part that changes the state from the part that queries the state in an application. Axon is a Java framework implementing the building blocks of CQRS to help in when building CQRS applications, Dadepo Aderemi, writes in a series of blog post explaining CQRS by building a small demo application based on the Axon Framework.

Architecture & Design Follow 2411 Followers

CQRS, Read Models and Persistence

by Jan Stenberg Follow 37 Followers on  Oct 20, 2015 4

Storing events in a relational database and creating the event identity as a globally unique and sequentially increasing number is an important and maybe uncommon decision when working with an event-sourced Command Query Responsibility Segregation (CQRS) system Konrad Garus writes in three blog posts describing his experiences from a recent project building a system of relatively low scale.

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A Critical Look at CQRS

by Jan Stenberg Follow 37 Followers on  Jul 20, 2015 7

Looking at Command Query Responsibility Segregation (CQRS) in a larger architectural context there are other architectural styles available. There are database technologies solving the same problems but in a simpler way, Udi Dahan states looking into ways of approaching CQRS. There is also a way that fulfils a lot of the CQRS goals but with fewer moving parts when CQRS is really needed.

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Introducing CQRS and Event Sourcing with a Demo Application

by Jan Stenberg Follow 37 Followers on  Jun 08, 2015

Improving on his understanding of the architecture and patterns involved in Command Query Responsibility Segregation (CQRS), Sacha Barber has created a complete CQRS demo application including event sourcing and an article with a cross examination of the inner workings.

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Advantages of CQRS

by Jan Stenberg Follow 37 Followers on  May 06, 2015

Today’s applications are commonly unnecessarily complex or slow because of not using Command Query Responsibility Segregation (CQRS), Gabriel Schenker claims while stating he believes CQRS to be one of the most useful architectural patterns when used in the context of complex Line of Business (LOB) applications.

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CQRS as a Style of Thinking

by Jan Stenberg Follow 37 Followers on  Nov 20, 2014 3

A common context for Command-Query Responsibility Segregation (CQRS) is a collaborative domain with multiple users working on the same set of data, it is less suitable in domains with only a single user working on a piece of data, Udi Dahan explained when discussing CQRS in an interview.

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The Basics of Event Sourcing and Some CQRS

by Jan Stenberg Follow 37 Followers on  Sep 30, 2014 1

State transitions are an important part of our problem space and should be modelled within our domain, Greg Young states in a recent presentation focusing on basic event sourcing and how CQRS fits in.

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Experiences Building a Reactive Event-Driven CQRS Application

by Jan Stenberg Follow 37 Followers on  Aug 01, 2014

CQRS and Event Sourcing provide a clear and concise way to build distributed applications that adhere to the reactive manifesto, Duncan DeVore claimed in a recent presentation sharing his experiences building a distributed application using Akka and Scala.

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Building a Reactive DDD and CQRS Based Application Using Akka

by Jan Stenberg Follow 37 Followers on  Jun 28, 2014

DDD and CQRS are great for building scalable software considering concepts like bounded contexts, transaction boundaries and event based communication and is together with Akka a complete platform for building enterprise applications, Pawel Kaczor starts a three-part series building an reactive application based on these concepts.

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