Gridshore » Allard

Axon Framework 0.5 released

Allard — Sat, 24 Apr 2010 15:27:59 +0000

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Today, I finalized the 0.5 release of the Axon Framework. There is quite a number of changes since the 0.4 version. The 0.5 version is a major step towards production readiness of the framework.

Besides some changes to existing building blocks, such as [...]

What I have been doing lately – CQRS, CQRS and Axon

Allard — Tue, 13 Apr 2010 19:03:27 +0000

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Some people have asked be what I was working on lately, since they didn’t see any blogs from me the last months. Well, my life has been heavily focused on the investigation of all the capabilities of a very simple pattern: CQRS. As I [...]

Axon Framework – the CQRS framework for Java – version 0.4 released

Allard — Sun, 21 Feb 2010 15:57:56 +0000

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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 [...]

CQRS – Designing domain events

Allard — Wed, 27 Jan 2010 11:33:31 +0000

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Command-Query Responsibility Segregation (CQRS) is slowly but steadily gaining ground as an architecture that helps developers to develop scalable, extensible and maintainable applications. Events play a major role in this architecture, and the way you design these events greatly influence the extensibility of [...]

CQRS made easy with cqrs4j

Allard — Mon, 21 Dec 2009 08:37:00 +0000

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Command Query Responsibility Segregation (CQRS) is an architectural style that makes a clear distinction between commands, which tell an application to do something, and queries, which are requests for information from an application. This distinction comes from the fact that the requirements (and [...]

Domain Driven Design and the equals method

Allard — Wed, 29 Jul 2009 08:46:52 +0000

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Implementing an equals method in Java can be quite complicated. Fortunately there are numerous document around the web with useful tips, hints and frameworks to assist you in this process. However, an implementation of the equals method that is technically correct doesn’t have to [...]

Designing the Repository interface

Allard — Wed, 01 Jul 2009 19:58:49 +0000

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In one of my most recent projects, I decided to design and build the application according to the principles of Domain Driven Design. One of the guidelines promoted by Domain Driven Design is the way the interface of the Repository is designed. This changed [...]

The power of immutability in a Rich Domain Model

Allard — Mon, 06 Apr 2009 19:00:00 +0000

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As many other developers, I’ve been used to the fat service layer and the anemic domain model of the transaction script pattern. In that programming model, immutability is pretty much as rare as a Dodo. However, I have been investigating the rich domain model [...]

Injecting Domain objects with Spring

Allard — Tue, 27 Jan 2009 12:52:20 +0000

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Using Spring, it is easy to inject any instance with its dependencies, as long as the instance is managed by the Spring container. This typically means that the to-be injected beans are configured in the XML configuration. However, sometimes, it is impossible or ugly [...]

Building Spring DM server compliant OSGi bundles with Maven

Allard — Sat, 03 Jan 2009 11:54:36 +0000

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Recently, SpringSource released the first version of their DM server. The SpringSource DM Server provides the ability to build enterprise web applications. In the basis, S2DM is a fine mixture of Equinox and Tomcat.

Building OSGi-based web applications was already possible, but it [...]