Phone App

Phone catalog and order application based on microservices and docker.

Microservices

• catalog-service (to store and list phone data and check available phones)
• order-service (to add new orders and list completed orders)

Each service handles it's own database (containerized MongoDB).

Relationship

order-service calls catalog-service to verify if phones are available (stock control not yet implemented) and to retrieve phone list metadata (name, price)

App requirements

• Spring Boot
• Spring Framework
• JDK 10
• Docker

Run application (docker)

$ docker-compose up

Questions

How would you improve the system?

• Add a cache mechanism to the database queries.
• Add a gateway and a service discovery like Eureka.
• Add a circuit breaker to control cascading service failure.

How would you avoid your order API to be overflow?

• Add a back pressure mechanism provided by WebFlux (Spring Boot 2 + Spring Framework 5).