服务熔断

Posted on 2019-02-18 22:58 work hard work smart 阅读(195) 评论(0) 编辑收藏举报


@HystrixProperty(name = "circuitBreaker.enabled", value = "true"),//设置熔断
@HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"), //最小请求数
@HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"), //10秒
@HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60") //滚动时间10秒钟，有7次发生错误。断路器被设置为打开状态。

一、HystrixController .java

@RestController
@DefaultProperties(defaultFallback = "defaultFallback")
public class HystrixController {
 
 
 
    //@HystrixCommand(fallbackMethod = "fallback")
    //2、超时设置
    /*@HystrixCommand(commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000") //超时时间设置为3秒
    })*/
    //3.
    @HystrixCommand(commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"),//设置熔断
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60")
    })
    @GetMapping("/getProductInfoList")
    public  String getProductInfoList(@RequestParam("number") Integer number){
        if(number % 2 == 0){
            return  "success";
        }
        RestTemplate restTemplate = new RestTemplate();
       return restTemplate.postForObject("http://127.0.0.1:8091/product/listForOrder", Arrays.asList("157875196366160022"),String.class);
 
    }
 
    private String fallback(){
        return "太拥挤了，请稍后再试~~";
    }
 
 
    private String defaultFallback(){
        return "默认提示：太拥挤了，请稍后再试~~";
    }
}

Product工程中的方法

@PostMapping("/listForOrder")
public List<ProductInfo> listForOrder(@RequestBody List<String> productIdList){
    try {
        Thread.sleep(2000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    return  productService.findList(productIdList);
}

调用：

number为2时成功返回

number为1时，触发熔断

熔断：

不停的调用 http://localhost:8081/getProductInfoList?number=1 。

然后调用http://localhost:8081/getProductInfoList?number=2，也出现拥挤提示

然后再次调用http://localhost:8081/getProductInfoList?number=2 就正常了。

二、使用配置，设置过期时间

设置超时时间为1秒

spring:
  application:
      name: order
  redis:
    host: 47.48.47.40
    port: 6379
  cloud:
    config:
      discovery:
        enabled: true
        service-id: CONFIG
      profile: test
hystrix:
  command:
    default:
      execution:
        isolation:
           thread:
              timeoutInMilliseconds: 1000

接口配置

@HystrixCommand
@GetMapping("/getProductInfoList")
public  String getProductInfoList(@RequestParam("number") Integer number){
    if(number % 2 == 0){
        return  "success";
    }
    RestTemplate restTemplate = new RestTemplate();
   return restTemplate.postForObject("http://127.0.0.1:8091/product/listForOrder", Arrays.asList("157875196366160022"),String.class);
 
}