Command-Query Responsibility Segregation (CQRS) represents a fundamental shift in how we look at architecting complex software solutions.  It suggests that decomposition of complex systems into (relatively) narrowly-focused isolated subsystems with carefully-considered discrete responsibilities is the best way to manage complexity and achieve scalability.  But CQRS has come under fire from its critics as introducing needless complexity to solve what are otherwise simple problems.  Which is it?

Perhaps both :)  In this talk by Stephen Bohlen we’ll take a look at understanding CQRS as a set of fundamental design principles and explore common implementation patterns that many are today using to translate these principles into practice.  Along the way, we’ll demystify terms like Event Sourcing, Read-Models, Command-Handlers, Write-only Domain Models, Message Buses, and more.  We’ll explore all of these in the context of a working CQRS-based system that demonstrates these concepts in action.

About the Speaker:

Currently a Senior Software Engineer for the SpringSource division of VMware where he is the Technical Lead and Community Evangelist for the Spring.NET Framework, Stephen brings his varied 18-year-plus experience in software and technology to the design and delivery of Software Engineering Solutions and Frameworks for other Software Engineers.  In addition to his work on Spring.NET, Stephen is also an active contributor to several other .NET Open-Source Software projects including NHibernate, NDbUnit, and others.  Stephen is also a current and past Microsoft MVP award recipient, a member of the ASP Insiders and Visual C# Insiders, and presently holds the office of the Vice President for INETA, North America.

This meeting will be held at the Microsoft offices as usual. Check the Meetup site for details!