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spring-cloudnetflix-feign

Feign client packaging

I'm quite new to Feign. Just discover it today ... My first question when i read about Spring Cloud Feign is : "how do you package your feign client ?"

I'm taking an example. Suppose we have 2 microservices M1 and M2. M2 consume a endpoint from M1.

We can for example, build 2 jars for M1 :

  1. the first one will be the microservice itself.
  2. the second one can be the Feign client of M1, exposing the services.

In this solution, I saw an analogy with EJB2 stub and skeleton parts. And I saw another possible advantage : the Feign client is always in sync (v1) with the implementation (v1).

or do you only declare the Feign client inside the M2 microservices. That is if a third microservice need M1, it will also declare a Feign client (that can be a little different because its needs are different).

Perhaps I'm totally wrong, please correct me.

Thanks a lot ! Bye

Solution

  • The main idea behind Feign is only getting a rest client for your Microservice, and of course, it should be in sync with the exposed service

    With this info in mind:

    do you only declare the Feign client inside the M2 microservices. - Yes, your M2 should declare a dependency on it to consume the exposed service by M1

    That is if a third microservice need M1, it will also declare a Feign client (that can be a little different because its needs are different). - I don't think so, the client should be the same all the time, it could be different only if your API rest has changed, otherwise, all feign clients should be the same