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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.

Introducing Reactive Streams

by Jan Stenberg on  Sep 30, 2015

Modern software increasingly operates on data in near real-time. There is business value in sub-second responses to changing information and stream processing is one way to help turn data into knowledge as fast as possible, Kevin Webber explains in an introduction to Reactive Streams.

Domain Events and Eventual Consistency

by Jan Stenberg on  Sep 27, 2015 1

Eventual consistency is a design approach for improving scalability and performance. Domain events, a tactical element in Domain-Driven Design (DDD), can help in facilitating eventual consistency, Florin Preda and Mike Mogosanu writes in separate blog posts, each describing the advantages achievable.

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.

A Critical Look at CQRS

by Jan Stenberg 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.

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.

A Service is a Logical Construct Built by Microservices

by Jan Stenberg on  Mar 31, 2015

A service is a logical construct owning a business capability and made up of internal autonomous components or microservices that together fulfil the responsibilities of the service, Jeppe Cramon suggests continuing a previous series of blog posts clarifying his view on building services around business capabilities and bounded contexts.

Making Sense of Event Stream Processing

by Jan Stenberg on  Mar 22, 2015 1

Structuring data as a stream of events is an idea appearing in many areas and is the ideal way of storing data. Aggregating a read model from these events is an ideal way to present data to a user, Martin Kleppmann claims explains when describing the fundamental ideas behind Stream Processing, Event Sourcing and Complex Event Processing (CEP).

Pointer Events Reaches W3C Final Stage, “Recommendation”

by Abel Avram on  Feb 25, 2015

The World Wide Web Consortium (W3C) has published the Pointer Events standard as a recommendation for wide adoption, but its future is in doubt as Apple and Google are refusing to implement it.

jQuery Takes Over the Pointer Events Polyfill from Google

by Abel Avram on  Dec 30, 2014 1

The Chromium team announced back in August that Google is no longer working on implementing Pointer Events in Chrome in order to focus on Touch Events. Now they have given control to the Pointer Events polyfill library to jQuery which is hoping to “drive developer adoption of this unified event system” and eventually see “all browsers implement this standard natively.”

Experiences and Good Practices from Hackathons

by Ben Linders on  Dec 27, 2014

Hackathons are events where developers work together during a fixed period to collaboratively develop software. They provide learning opportunities and space for developers and organizations sponsoring the hackathons to network and have some fun.

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.

Sharing Data Between Bounded Contexts in Domain-Driven Design

by Jan Stenberg on  Nov 25, 2014 1

When using Domain-Driven Design (DDD) separating the concerns of a large system into bounded contexts with each context using its own data store there is often a need to share some common data. One way of doing that is to let each context publish events about changes, events that others can listen to, Julie Lerman recently explained in MSDN Magazine.

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