Which could be the best way for communication of Micro-services without any HARD-CODE

Question

I having a bunch of microservices which communicates with each other using RestTemplate. All the communication of microservices is from API gateway.

I am doing as following,

    public List<ServiceInstance> serviceInstancesByApplicationName(String applicationName) {
            return this.discoveryClient.getInstances(applicationName);
        }

    //some Other logic 

    List<ServiceInstance> apigatewaymsInstanceList = discoveryClient.getInstances(apigatewaymsName);
            ServiceInstance apigatewaymsInstance = apigatewaymsInstanceList.get(0);

    //and

    restTemplate.exchange(apigatewaymsInstance.getUri().toString() + plmpayloadprocessmsResource, HttpMethod.POST,
                                entity, String.class);

But here it appears like a hard code. Is there some another approach I am missing? What could be the best way ?

Likewise, I am asking is there any method available so that I can pass the name of application and eureka return me its full URI no need to do applicationgetInstaceId(0);

Answer 1

You can make use of the EurekaClient#getNextServerFromEureka. You might have to create the URI yourself but that should be trivial.

@Autowired
EurekaClient eurekaClient;


public void executeMethod()     {
    InstanceInfo loadBalancedInstance = eurekaClient.getNextServerFromEureka("myService", false);
    //do work
}