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Derek Comartin

Event Stream as a Message Queue

I was recently having a discussion around a system being built using Microsoft Azure.  Some concepts being discussed for this system where CQRS, Event Sourcing and Message Queue. The diagram below is fairly typical when discussing CQRS and Event Sourcing. One of the first things that stood out to me was the use of the Message Queue and Azure Service Bus. For this blog post, I want to focus on the Service bus, which is used for publish-subscribe pattern.  The domain will emit events that are stored to the event stream and then will be published to the Service Bus.  Subscribers, such as… Read More »Event Stream as a Message Queue

ConfigR: Look Mom, No XML

I stumbled upon ConfigR a several months ago  on twitter from Glenn Block.  It uses ScriptCS (and Roslyn) and was developed by Adam Ralph. I finally got around to take it for a test drive on a side project.  It’s really a simple tool that I’ve been waiting for. Why ConfigR? The purpose of ConfigR is pretty straight forward.  It allows you to write C# code to define configuration settings which you would normally place in a the appSettings section of a web.config/app.config. If you have used the appSettings at all, you probably wished they could be typed instead of always having to… Read More »ConfigR: Look Mom, No XML

How to get started with CQRS & Event Sourcing

When I first heard about CQRS & Event Sourcing concepts through various blogs and videos, primarily from Greg Young and Udi Dahan, I wanted to apply it everywhere. It seems really natural to want to take the limited knowledge we have about a new concept or technology and try and apply it to any problem. Most of us know this is a terrible idea, but we are so tempted to push the concepts on a problem that it just doesn’t fit. I realize I’m grouping CQRS and Event Sourcing together in this post.  Generally, if you are applying Event Sourcing then… Read More »How to get started with CQRS & Event Sourcing