CQRS Booking
You should implement a simple booking solution in CQRS architecture.
About CQRS
CQRS for Command Query Responsibility Segregation Pattern.
A query returns data and does not alter the state of the object. A command changes the state of an object but does not return any data.
We will split our code in read and write code to really live this pattern
Booking subject
We want to make a booking solution for one hotel.
The first 2 users stories are :
- As a user i want to see all free rooms.
- As a user i want to book a room. They want to use the CQRS pattern, To do that we will have :
One command service with a function bookARoom(Booking) they call the WriteRegistry they notify the ReadRegistry called by query service with function Room[] freeRooms(arrival: Date, departure: Date)
The Booking struct contains
- client id
- room name
- arrival date
- departure date
And the Room struct contain only
- room name
- source
Expectations
Your work will be evaluated primarily on:
- Cleanliness of the code
- Use modern ES6+ syntax, async/await, elegant & readable code
README.mdfile explaining your high level solution and any decisions you made and the reasons behind them
References
Inspiration source of this kata
Explanation of CQRS by Microsoft