CountryNeighborsTour

Maven based Spring boot 2 API which has been built using:

1. Reactive Feign Client
2. Ehcache
3. Lombok
4. Resilience4j-Retry: Used it to retry country API calls.
5. Reactor
6. Reactor Extra utils: Spring built-in caching @Cacheable & ... other annotations does not support caching of Mono & Flux so used this functional lib to cache Feign call results
7. Spring Security & OAuth: to implement the 2 bonuses
8. Swagger using springdoc-openapi-ui

To run the program:

1. value of google.client-id in application.properties has to be changed based on the value you get from Google APIs Console
2. google.client.secret env variable has to be passed to the java application
3. rapid.api.key env variable has to be passed too, this is the key you get after registering in rapidAPI

Secrets google.client.secret & rapid.api.key should be stored in secure place and for simple application an env variable could be a good fit, but for production applications it would be better to store them in secrets manager like Hashicorp Vault