SleuthBug

sample.java

package com.example;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.sleuth.sampler.AlwaysSampler;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.cloud.netflix.feign.FeignClient;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

@SpringBootApplication
@RestController
@EnableFeignClients
@EnableCircuitBreaker
public class SleuthSampleApplication {

    private static final Logger LOG = Logger.getLogger(SleuthSampleApplication.class.getName());

    @Autowired
    private RestTemplate restTemplate;

	@Autowired
	private ParticipantsBean participantsBean;

	public static void main(String[] args) {
		SpringApplication.run(SleuthSampleApplication.class, args);
	}

    @Bean
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }

	@Bean
	public AlwaysSampler defaultSampler() {
		return new AlwaysSampler();
	}

	@RequestMapping("/")
	public String home() {
		LOG.log(Level.INFO, "you called home");
        return "Hello World";
	}
	
	@RequestMapping("/callhome")
	public String callHome() {
		LOG.log(Level.INFO, "calling home");
        return restTemplate.getForObject("http://localhost:8080", String.class);
	}
}

@Component
class ParticipantsBean {
	@Autowired
	private ParticipantsClient participantsClient;

	@HystrixCommand(fallbackMethod = "defaultParticipants")
	public List<Object> getParticipants(String raceId) {
		return participantsClient.getParticipants(raceId);
	}

	public List<Object> defaultParticipants(String raceId) {
		return new ArrayList<Object>();
	}
}


@FeignClient("participants")
interface ParticipantsClient {

	@RequestMapping(method = RequestMethod.GET, value="/races/{raceId}")
	List<Object> getParticipants(@PathVariable("raceId") String raceId);

}