We want to make a booking solution for one hotel. The first 2 user stories are:
- As a user I want to see all free rooms.
- As a user I want to book a room.
The Booking struct contains
- client id
- room name
- arrival date
- departure date
And the Room struct contain only
- room name
In order to face a scalable solution I used tactical DDD with CQRS on top of Hexagonal Architecture. For that there're 3 main folders 👇
src/application👉 Contains all the top level services divided into commands, queries and events.src/domainmodel👉 Contains all the business logic. For business logic I considered all the elements that change application state. In this case, the bookings. So this leaves all the reads out of the domainlayer and this also implies queries & query handlers.src/infrastructure👉 Implementation details such as persistence.
As for the delivery mechanism, I used NestJs as framework of choice given it's maturity and all the built-in features it comes with. Features used 👇
- Delivery Mechanism 👉 NestJs
- Persistence layer 👉 TypeORM
- CQRS framework 👉 NestJs CQRS
For this you will need to have Docker installed. Then run
docker compose up -d
Once everything is running, just point your browser to