SpringCloud第七节内容精简（下），Hystrix断路器和服务熔断

服务的降级->再到熔断 ->恢复调用链路

当检测到响应正常后，恢复。

 

修改 8001项目的service层。窗口期10秒，10秒内错误达到一定次数接下来输入对的也会失败

package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 * Created by IntelliJ IDEA.
 * User: zhuangzibing
 * Date: 2020/7/1
 */
@Service
public class PaymentService {
    public String paymentInfo_Ok(Integer id){
        return "线程池："+Thread.currentThread().getName()+"paymentInfo_ok,id:"+id;
    }


    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler",commandProperties = {
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="5000")
    })
    public String paymentInfo_TimeOut(Integer id){
        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池："+Thread.currentThread().getName()+"paymentInfo_TimeOut,id:"+id+"耗时5秒";
    }

    public String paymentInfo_TimeOutHandler(Integer id){
        return "线程池："+Thread.currentThread().getName()+"paymentInfo_TimeOutHandler,id:"+id+"拦截方法";
    }



    //=====服务熔断
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),// 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),// 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),// 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id)
    {
        if(id < 0)
        {
            throw new RuntimeException("******id 不能负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号: " + serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id)
    {
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~   id: " +id;
    }

}

控制器加多一个方法

//服务熔断
    @GetMapping("/payment/circuit/{id}")
    public String paymentCircuitBreaker(@PathVariable("id") Integer id){
        String result = paymentService.paymentCircuitBreaker(id);
        log.info("******result"+result);
        return result;
    }

启动类 

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class PaymentHystrixMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentHystrixMain8001.class,args);
    }
}

效果图。输入-1后返回错误信息。然后重复刷新，接下里输入正确的也会熔断

 

可以参考所有配置

https://blog.csdn.net/bailaoshi666/article/details/107087268

 

服务限流在阿里巴巴的Sentinel说明