BookARoom is a simple project to explain CQRS during a live coding session at MS experiences'16
The project is a dotnet core ASP.NET web site (in order to be containerized in the next session), allowing users:
- To consult and search for available rooms (READ model)
- To book a room (WRITE model)
Of course, booking a room (write model) will impact the read model accordingly.
This project is not a real one nor a prod-ready code. The intent here is to illustrate the CQRS pattern during a 40 minutes session. Thus, some trade-offs have been taken in that direction (e.g. the usage of Command and Queries terminology instead of domain specific names that I would have used otherwise).
Yes, since the timing will be short for this MS experiences'16 session in Paris (no more than 30 minutes of live-coding), I've decided to focus only on CQRS pattern, WITHOUT Event Sourcing (ES). Indeed, ES is often a mental dam for people's understanding.
I also find important that people understand that CQRS 
Event sourcing, but CQRS != Event sourcing.
- Plug the ASP.NET web app
- Fight against the current anemic model (mainly because I never worked on that topic and that I don't have any expert available to help me ;-( and embrace more the ubiquitous language of this domain.
- Identify which use case(s) will be usefull to live-code at MS event (to zoom on CQRS) and to find the best pedagogical workflow for it.
- CQRS (WITHOUT Event Sourcing):
- why CQRS?
- Pattern origin
- How read and write models articulate
- Eventual consistency
- Short clarification between CQRS & Event sourcing
- How Outside-in TDD works
- How Hexagonal Architecture can help us to focus on Domain first, before tackling the infra code (ASP.NET) in a second time
- What is dotnet core and how it articulates with the new version of ASP.NET
-
BookARoom.Domain: containing all the domain logic of the solution (for both read and write models). (has no dependency) -
BookARoom.Infra: ASP.NET core project hosting the infrastructure code (i.e. non-domain one like adapters) for both read and write models. (depends on both Domain and IntegrationModel projects and is also an ASP.NET dotnet core project)
-
BookARoom.Tests: containing tests for all projects. (depends on all the other BookARoom projects)
-
BookARoom.IntegrationModel: command-line project to generate integration json files for hotel (from code). (has no dependency)
Note: resharper and ncrunch don't support yet dotnet core; you can only run them via Visual Studio test runner (e.g. Ctrl-R, A) or by executing:
dotnet test
within the BookARoom.Tests project directory.
There are many forms of CQRS implementation. The implementation of the BookARoom project follows this version:
source: https://msdn.microsoft.com/en-us/library/jj591573.aspx
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