Configure Project to use resilience4j Circuit Breaker - Feign

[hazartilirot]

Hi there.

Actually, you almost don't need resilience4j. I have seen the latest Sergey's implementation, but I decided to stick to what I had seen in the video with Hystrix

pom.xml

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>4.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-circuitbreaker-resilience4j</artifactId>
        </dependency>

Then, you need to enable fallback as it is suggested in the video though it has slightly different parameters:

In the application.properties / application.yml of the PhotoAppApiUsers set the following:

spring:  
  cloud:
    openfeign:
      circuitbreaker:
        enabled: true

I would also suggest switching to the ERROR mode.

logging:
  level:
    com:
      appsdeveloperblog:
        photoapp:
          api:
            users:
              client:
                AlbumsServiceClient: ERROR

I couldn't have figured out as to why I see an exception. The result was completely different from what Sergey gets in the video.

Finally, when I change the DEBUG to ERROR mode my console is clean now.

The last step is quite the same as you see in the video.

@FeignClient(name = "albums-ws", fallback = AlbumsFallback.class)
public interface AlbumsServiceClient {

    @GetMapping("/users/{id}/albums")
    List<AlbumResponseModel> getAlbums(@PathVariable String id);
}

@Component
class AlbumsFallback implements AlbumsServiceClient {

    @Override
    public List<AlbumResponseModel> getAlbums(String id) {
        return new ArrayList<>();
    }
}