this is a solution based on micro-service architecture to easily add / remove services providers without effecting other providers and without effecting the main services consumer.

in this solution i used spring boot and spring cloud to implement microservice archtiture here are some of the modules used in the solution:

• Service Discovery (Eureka Naming Server)
• Feign Rest Client
• Hystrix for fault tolerance
• Rest Controllers
• Swagger for api documentation

In this paragraph i will explain the archticture ,our solution contains five component , four core microservices, bestHotel, crazyHotel ,available hotel which act as a consumer for other services and aggregateHotels, the aggregate hotel micro service act as bridge or as some other people call front door to other underlying micro service ,finally eruka naming server which will register and ease the communication between services.

The purpose of the aggregate service is to be the main portal to microservices leaving each microservice sperate independent from other services,so adding or removing microservice will be maintained only in the aggregate service code, the aggregate service is the key for this structure to because it will calls each relevant microservice collects the data, apply business logic to it, and further publish it is as a REST Endpoint.

Implementating hystrix applied defensive programming strategy is essential, if besthotel service provider went down , our main service consumer won't go down and will not recive an error but instead hystrix will call a FallBack Command which will handle besthotel microservice fauiler.

To run and test the project please run the following respectively

• Eruka Naming Server (must be first)
• Best Hotel Serivce
• Crazy Hotel Service
• Aggregate Hotel Serivce
• Available Hotel Service (Consumer Service)

After luanching the projects ,testing the main consumer service available hotel can be done through swagger at: http://localhost:8082/swagger-ui.html#/

Please note that Shutting down any of the provider service won't effect the overwhole process ,as if crazy hotel service provider shut down ,the following will happen:

• hystrix fall back will be triggered
• aggregate service will collect data from alive providers in our case besthotels service
• our consumer will still gets the data of best hotels after all.

✔️ cover the solution with unit testing using JUnit added junit for both best hotel and crazy hotel micro service

• add Load Balancing Ribbons to microservice .

please feel free to ⭐ happy programming ✌️