SM360 Backend Tech Assignment

Implement a REST service for managing listings for online advertising service.

Terminology

• Listing - a vehicle ad, usually consists of information about a vehicle and some other information, like who is selling a car, price, posting date, etc. Listing can be in one of two possible states:
  • published - available online or
  • draft - not available online.
• Car Dealer - a business that sells new or used cars.
• Tier Limit - a number of published listings a dealer can have online.

Requirements

Service should implement following functionality:

• Create a listing. All the created listings should have state draft by default;
• Update a listing;
• Get all listings of a dealer with a given state;
• Publish a listing;
• Unpublish a listing.

Please note that the number of published listings for a dealer should be less or equal to the dealer's tier limit. When publishing a listing, client should be able to choose how to deal with situation when tier limit is reached - either

• return an error to the client, or
• publish a listing, but unpublish the oldest listing of a dealer to conform to the tier limit.

Come up with an additional functionality of your choice that could give value to the service.

Notes

• Our tech stack is mostly Java with Spring framework.
• Please create a 'production-ready' service as you see it (documentation / tests / logs / exception handling).
• Please provide an instruction on how to run the app.
• Submit your solution either as a public repository (github, gitlab etc.) or as a zip archive.