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InfoQ Homepage CQRS Content on InfoQ

  • Interview with Event Modeling Founder - Adam Dymitruk

    Q&A with Adam Dymitruk about the Event Modeling Project: its genesis, reason for existence, feature set and future plans.

  • Axon 4.4 Improves Server Performance, Simplifies Framework Usage, and Enhances Developer Experience

    AxonIQ has formally released Axon 4.4, a major release of the framework and server infrastructure that helps build event-driven microservices applications utilizing CQRS/event sourcing and domain-driven design.

  • Day Two Problems When Using CQRS and Event Sourcing

    There are a lot of good reasons for building a CQRS and event-sourcing based system, but there are also problems that appear only after an application is in production. In a presentation at the recent Event-driven Microservices Conference held by AxonIQ, Joris Kuipers shared his experience running and evolving CQRS and event sourced applications in production.

  • Are Frameworks Good or Bad, or Both?

    Preferring frameworks or libraries is somewhat controversial, Frans van Buul, Evangelist at AxonIQ, the company behind Axon Framework, writes in a recent blog post. Many argue in the favour of libraries but Van Buul thinks that a framework can be very valuable when building business applications. He believes this to be especially true for applications based on CQRS, DDD and event sourcing.

  • Axon Conference Panel: Why Should We Use Microservices?

    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.

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

    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.

  • Axon Framework 3.3 with a Subscription Query API and Kafka Support

    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.

  • Sharing Experiences from a Microservices Journey

    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.

  • Comparison of Event Sourcing with Stream Processing

    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.

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

    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.

  • CQRS Example Using Axon Framework

    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.

  • CQRS, Read Models and Persistence

    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.

  • A Critical Look at CQRS

    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.

  • Introducing CQRS and Event Sourcing with a Demo Application

    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.

  • Advantages of CQRS

    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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