This article explains how the concept of upcasting can be applied to an event-sourced model. Focusing on demultiplexing of events, a new feature in Axon 2.
Axon Framework – the CQRS framework for Java – version 0.4 released
Last week, I published the 0.4 release of the Axon Framework. Axon helps developers build high performance, scalable and extensible applications using the CQRS pattern. The 0.4 release is a major step towards 1.0, and includes transactional event handling, high-performance caching repositories and easy configuration of event sourcing support. Furthermore, we have also built a […]
Rethinking architecture with CQRS
Many applications use some form of persistent storage to store its state. However, important information about this state is lost: why is the state as it currently is. Furthermore, a single model is used to store information that is retrieved for many different purposes, often resulting in extremely complex and bog-slow SQL queries. Command Query […]
DDD and modern software development
One of the main things we do @ jteam is creating rock solid custom development. Of course we use proven frameworks, we keep innovating and we use a lot of the best practices for custom software development. Best practices I am talking about are: Continuous Integration, Test Driven Development, Peer reviews and of course Scrum. […]
JTeam Technology Matrix: The Stars
In Alef’s previous blog entry about the JTeam Technology Matrix, he explained the basic idea of using a BCG-matrix to classify technologies. In this blog entry I’ll focus on the ‘Star’ section of our current matrix and highlight some of the technologies that are currently in there. Star technologies are the technologies that bring us […]
Domain Driven Design applied
In a recent project for Osix, we developed an application allowing visitors of a library to use the wireless Internet connection available there. Visitors can pay for the Internet access in two ways: an online payment, for example using a credit card or by deducting the amount from their library account. All user accounts, as […]
The misunderstanding of Domain Driven Design
There seem to be two mainstream approaches in Java application development: the domain driven approach, and the “fat service layer” or Transaction Script approach. As an architect, I’ve been investigating both methodologies by reading about both of them and applying them in real life enterprise projects. It is at the least amusing to see how […]