Hystrix 熔断机制

1 导入依赖

org.springframework.cloud
spring-cloud-netflix-hystrix</artifactId》

2 启动类加注解

@SpringBootApplication
@EnableDiscoveryClient //服务发现注解
@EnableFeignClients //feingn远程调用注解·
@EnableCircuitBreaker //Hystrix注解

public class OrderApplication {

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

3 控制器

@RestController
@Slf4j
public class HystrixController {

@Autowired
private ProductClient productClient;


@HystrixCommand(fallbackMethod = "fallback")
@GetMapping("/getHystrix")
public String getProductMeg4() {
    RestTemplate restTemplate = new RestTemplate();

    return restTemplate.postForObject("http://localhost:8089/product/listForOrder", Arrays.asList("157875196366160022"), String.class);
}
/**
 * 回调
 * @return
 */
private String fallback() {
        return "哎呀 ，地球怎么找不到你了"  ;
}

}

注意 版本不同 HystrixCommand 注解没有 + 依赖

com.netflix.hystrix
hystrix-javanica
RELEASE

4 浏览器中 查找

当发生雪崩情况下会调用回滚函数