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CQRS, Read Models and Persistence

by Jan Stenberg 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.

Dino Esposito on CQRS, Messages and Events

by Jan Stenberg on  Aug 31, 2015 1

Command Query Responsibility Segregation (CQRS) is the starting point of a change that will have a profound impact on system architecture, Dino Esposito claims in three articles in MSDN Magazine. It’s the first step in an evolution transitioning software architects from the idea of “models-to-persist” to the idea of “events-to-log” and about event-based data instead of data snapshots.

DDD, Events and Microservices

by Jan Stenberg on  Jun 29, 2015 1

To make microservices awesome Domain-Driven Design (DDD) is needed, the same mistakes made 5-10 years ago and solved by DDD are made again in the context of microservices, David Dawson claimed in his presentation at this year’s DDD Exchange conference in London.

Introducing CQRS and Event Sourcing with a Demo Application

by Jan Stenberg 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.

Advantages of CQRS

by Jan Stenberg 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.

The Future of Microservices

by Jan Stenberg on  Dec 01, 2014 2

Microservices are not new ideas and we will over the course of 3-5 years end up rebuilding WS-* the same way Web Services did rebuild all from CORBA unless we learn from our mistakes and improve to prevent them from being made again, Greg Young stated in a presentation at the Microservices Conference in London.

CQRS as a Style of Thinking

by Jan Stenberg 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.

The Basics of Event Sourcing and Some CQRS

by Jan Stenberg 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.

Experiences Building a Reactive Event-Driven CQRS Application

by Jan Stenberg 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.

Building a Reactive DDD and CQRS Based Application Using Akka

by Jan Stenberg 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.

Greg Young: Scheduling for Things to Happen in the Future

by Jan Stenberg on  Jun 23, 2014

Delay of message sending into the future is a very powerful pattern and is often the preferable way of dealing with temporal problems compared to batch job that will run a query on the domain model and update some aggregates, Greg Young explained at the recent DDD Exchange conference in London.

CQRS Framework Axon 2.1 with Increased Event Handler Support and Performance Improvements

by Jan Stenberg on  Feb 22, 2014

Version 2.1 of CQRS framework Axon supports annotations and ordering of event handlers, a new conflict resolution together with performance improvements. The recently released version also adds compatibility with OSGi.

Greg Young on Using Complex Event Processing

by Jan Stenberg on  Jan 29, 2014 4

Complex Event Processing, CEP, can be very useful for problems that have to do with time e.g. querying over historical data when you want to correlate things that have happened at different times, Greg Young explained in a recent presentation.

Event Store 2.0 Released with Security Support and the Projections Library in Beta

by Jan Stenberg on  Jul 27, 2013

Version 2.0 of the Event Store, (an Event Source based persistence engine), was released last week with support for security, allowing for lock down of the Event Store and setting up Access Control Lists on event streams. The Projections library is now in beta and more documentation has been added.

Greg Young on Documents and Processes as an Alternative to Events

by Jan Stenberg on  Jun 18, 2013

Not all systems are based on events or facts. In some problem spaces events make complete sense; they are about facts that are happening over periods of time. But a lot of systems are instead focused on information that flow through a process, Greg Young explained at DDD Exchange Day in London last week, using handling of a mortgage application inside a bank as an example.

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