Java Spring - intercepting execution of a REST Client (Hystrix Feign)

Question

I have a REST client interface like this:

public interface NameSearchClient {
    @RequestLine("POST")
    @Headers("Content-Type: application/json")
    SearchResponse searchByName(NameSearchRequest request);

}

It gets implemented and set-up in a factory class like this:

@Component
public class NameClientFactory {
    public <T> T createFeignClient(Class<T> clientClass, String apiUrl) {
        return Feign.builder()
                .encoder(new GsonEncoder())
                .decoder(new GsonDecoder())
                .target(clientClass, apiUrl);
    }
}

I was wondering if it's possible to write an Aspect annotation that upon every call made by that client, executes some action (another HTTP call in my case) and adds a new header to the request? Is AspectJ the right tool for that?

score 1 · Accepted Answer · answered Apr 16 '19 at 08:24

Create a bean that implements feign.RequestInterceptor and do your work in there:

@Component
public class FeignRequestInterceptor implements RequestInterceptor {
  @Override
  public void apply(RequestTemplate template) {
    // your code here
  }
}

Java Spring - intercepting execution of a REST Client (Hystrix Feign)

1 Answers1