Hystrix的服务降级配置

Hystrix的服务降级，既可以配置在服务提供端，也可以配置在服务调用端，

但一般来说，配置在服务调用端！

服务提供者端：

1）业务类 ： 添加fallback方法

@Service
public class PaymentService {


    public String paymentInfo_ok(Integer id){
        return "线程池："+Thread.currentThread().getName()+
                " paymentInfo_ok,id:"+id+" O(∩_∩)O哈哈~";
    }


    @HystrixCommand(fallbackMethod = "paymentInfo_timeout_handler",
    commandProperties = {
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="3000") //程序运行超过3s, 就会进行服务降级
    })
    public String paymentInfo_timeout(Integer id){
        int timenumber=5;
        try {
            TimeUnit.SECONDS.sleep(timenumber);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池："+Thread.currentThread().getName()+
                " paymentInfo_timeout,id:"+id+" 耗时3秒！！";
    }

    public String paymentInfo_timeout_handler(Integer id){
        return "超时+兜底+ o(╥﹏╥)o";
    }

}

2）主启动类 ：添加@EnableCircuitBreaker注解

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

服务消费者端：

1）业务类

@RestController
@Slf4j
public class OrderController {

    @Autowired
    private PaymentHystrixService paymentHystrixService;

    @GetMapping("/consumer/payment/hystrix/ok/{id}")
    public String paymentInfo_ok(@PathVariable("id") Integer id)
    {
        String result = paymentHystrixService.paymentInfo_ok(id);
        return result;
    }


    @GetMapping("/consumer/payment/hystrix/timeout/{id}")
    @HystrixCommand(fallbackMethod = "paymentTimeOutFallbackMethod",commandProperties = {
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value="1500")
    })
    //@HystrixCommand
    public String paymentInfo_timeout(@PathVariable("id") Integer id)
    {
        int age = 10/0;
        String result = paymentHystrixService.paymentInfo_timeout(id);
        return result;
    }
    public String paymentTimeOutFallbackMethod(@PathVariable("id") Integer id)
    {
        return "我是消费者80,对方支付系统繁忙请10秒钟后再试或者自己运行出错请检查自己,o(╥﹏╥)o";
    }

    // 下面是全局fallback方法
    public String payment_Global_FallbackMethod()
    {
        return "Global异常处理信息，请稍后再试，/(ㄒoㄒ)/~~";
    }
}

2）主启动类

@SpringBootApplication
@EnableFeignClients
@EnableHystrix
public class ConsumerFeignHystrixMian80 {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerFeignHystrixMian80.class,args);
    }
}

Hystrix之全局服务降级DefaultProperties

出现的问题：

每个业务方法对应一个兜底的方法，代码碰撞

错误处理的方法和业务代码混淆在一块

解决

@RestController
@Slf4j
@DefaultProperties(defaultFallback = "payment_Global_FallbackMethod")
public class OrderController {

    @Autowired
    private PaymentHystrixService paymentHystrixService;

    @GetMapping("/consumer/payment/hystrix/ok/{id}")
    public String paymentInfo_ok(@PathVariable("id") Integer id)
    {
        String result = paymentHystrixService.paymentInfo_ok(id);
        return result;
    }


    @HystrixCommand
    public String paymentInfo_timeout(@PathVariable("id") Integer id)
    {
        int age = 10/0;
        String result = paymentHystrixService.paymentInfo_timeout(id);
        return result;
    }
    public String paymentTimeOutFallbackMethod(@PathVariable("id") Integer id)
    {
        return "我是消费者80,对方支付系统繁忙请10秒钟后再试或者自己运行出错请检查自己,o(╥﹏╥)o";
    }

    // 下面是全局fallback方法
    public String payment_Global_FallbackMethod()
    {
        return "Global异常处理信息，请稍后再试，/(ㄒoㄒ)/~~";
    }
}

Hystrix之通配服务降级FeignFallback

【由Feign来处理服务降级】

1）定义 fullback类

2）在Feign注解上进行配置

@Component
@FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT",fallback =PaymentHystrixServiceFullbackImpl.class )
public interface PaymentHystrixService {

    @GetMapping("/payment/hystrix/ok/{id}")
    public String paymentInfo_ok(@PathVariable("id") Integer id);

    @GetMapping("/payment/hystrix/timeout/{id}")
    public String paymentInfo_timeout(@PathVariable("id") Integer id);
}