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Progressive .NET Tutorials: Ian Cooper & Neil Robbins on CQRS: Why, What and How
CQRS: Why, What and How
Why: CQRS is the new 'hotness' but beyond a desire to use the latest 'fad' what might actually lead you to adopt this approach over a conventional layered architecture. Looking back we will explore how some of the debates in the DDD community about how to implement Eric Evans highlighting ideas led people to the CQRS solution. We will look at some of the problems with aggregates and repositories that CQRS helps with and how the vision of seperating core from other domains is simplified. We will also look at simple steps to begin moving your layered application in the CQRS direction and give you a taste of what is to come. By the end of this session you should understand the problems that transitioning to CQRS will help you to resolve.
Querying. The easiest part of CQRS to start with is probably querying. From building your view model directly instead of via your domain, through views or viewmodel stores up to dealing with eventual consistency we look at what it takes to put the Q into CQRS. We will talk about the difference between grid and task based approaches to the UI and how working on interaction style eases the burden to seperated queries. We will also look at composite UIs and how they become important when you begin working with scalable architectures. By the end of the session you should have an understanding of different approaches to seperating your queries from your commands and when to use them.
Commands: With queries under our belt it's time to look at commands. We'll look at how to work with a command bus to decouple your service layer. We will look at using domain events and why they are the missing concept in DDD. We will then talk about event sourcing capture events to allow you to rebuild the state of the system. We will show you how CQRS helps you to scale to meet increasing demand. By the end of this session you should know how to use commands to build a system instead of a more traditional layered architecture.
Help spread the word!
Just a thought...
If you are interested in DDD and CQRS, you may also be interested to attend the forthcoming DDD eXchange at Skills Matter in June or Eric Evans' DDD Immersion Workshop in the same week as that conference. Udi Dahan and Greg Young also regularly give courses related to DDD, Distributed Design and CQRS at Skills Matter.
ABOUT NEIL ROBBINS
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Neil is currently working as an applications architect at a multinational insurance company based in the City. He has previously worked variously as a developer, architect, and consultant.
More about Neil Robbins
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PODCAST CQRS: WHY, WHAT AND HOW
This session took part at the Progressive .NET Tutorials. You can view the other 13 podcasts here.
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