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衔接上篇: [Spring Cloud] Hystrix三大特性--降级,熔断,隔离_沫洺的博客-CSDN博客 

🍁配置文件统一设置参数

🌿全局默认配置

#统计的时间窗口，默认为10s，一般不需要更改
hystrix.command.default.metrics.rollingStats.timeInMilliseconds=3000
#是否开启降级
hystrix.command.default.fallback.enabled=true
#是否开启断路器
hystrix.command.default.circuitBreaker.enabled=true
#失败率达到多少后跳闸，在统计窗口期中，请求数大于阈值并且失败率达到60，则触发断路，断路器开启，链路中断
hystrix.command.default.circuitBreaker.errorThresholdPercentage=60
#请求最小触发次数
hystrix.command.default.circuitBreaker.requestVolumeThreshold=3
#断路后休眠状态的时长，默认为5s，断路8s后断路器进入半开状态
hystrix.command.default.circuitBreaker.sleepWindowInMilliseconds=10000
#开启超时机制
hystrix.command.default.execution.timeout.enabled=true
#取消是否中断
hystrix.command.default.execution.isolation.thread.interruptOnFutureCancel=true
#超时是否中断
hystrix.command.default.execution.isolation.thread.interruptOnTimeout=true
#超时阈值，单位是毫秒
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=3000

通过配置文件设置参加,就不需要在@HystrixCommand注解中配置参数commandProperties

🌾私有配置

 要想针对某个方法进行配置

hystrix.command.commandKey.metrics.rollingStats.timeInMilliseconds=30000
hystrix.command.commandKey.fallback.enabled=true
hystrix.command.commandKey.circuitBreaker.enabled=true
hystrix.command.commandKey.circuitBreaker.errorThresholdPercentage=50
hystrix.command.commandKey.circuitBreaker.requestVolumeThreshold=3
hystrix.command.commandKey.circuitBreaker.sleepWindowInMilliseconds=80000
hystrix.command.commandKey.execution.isolation.thread.interruptOnFutureCancel=true
hystrix.command.commandKey.execution.isolation.thread.interruptOnTimeout=true
hystrix.command.commandKey.execution.isolation.thread.timeoutInMilliseconds=3000
hystrix.command.commandKey.execution.timeout.enabled=true

定义test2方法,指定commandKey="hello2"

@RestController
public class Test {@GetMapping("/test")//@HystrixCommand(fallbackMethod = "hello_fallback",commandProperties =//        {//                @HystrixProperty(name = "circuitBreaker.enabled",value = "true"), //开启熔断器//                @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds",value ="30000"), //统计时间窗//                @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "3"),      //统计时间窗内最小请求次数阈值//                @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), //休眠时间窗口期//                @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "30"), //时间窗内失败阈值百分比//                //执行隔离线程超时//                @HystrixProperty(name = HystrixPropertiesManager.EXECUTION_ISOLATION_THREAD_TIMEOUT_IN_MILLISECONDS,value = "3000")////        })@HystrixCommand(fallbackMethod = "hello_fallback")public String hello(@RequestParam Integer time){ThreadUtil.sleep(time*1000);return "原方法";}@GetMapping("/test2")@HystrixCommand(fallbackMethod = "hello_fallback",commandKey = "hello2")public String hello2(@RequestParam Integer time){ThreadUtil.sleep(time*1000);return "原方法";}public String hello_fallback(Integer time){return "兜底方法";}
}

将配置中的commandKey替换成hello2,如下

hystrix.command.hello2.metrics.rollingStats.timeInMilliseconds=30000
hystrix.command.hello2.fallback.enabled=true
hystrix.command.hello2.circuitBreaker.enabled=true
hystrix.command.hello2.circuitBreaker.errorThresholdPercentage=30
hystrix.command.hello2.circuitBreaker.requestVolumeThreshold=3
hystrix.command.hello2.circuitBreaker.sleepWindowInMilliseconds=10000
hystrix.command.hello2.execution.isolation.thread.interruptOnFutureCancel=true
hystrix.command.hello2.execution.isolation.thread.interruptOnTimeout=true
hystrix.command.hello2.execution.isolation.thread.timeoutInMilliseconds=3000
hystrix.command.hello2.execution.timeout.enabled=true

🍂Hystrix与OpenFeign结合使用

Feign内部是支持Hystrix的

模拟hystrix-app服务调用nacos-a服务

子模块spring-cloud-hystrix添加依赖

        com.alibaba.cloudspring-cloud-starter-alibaba-nacos-discoveryorg.springframework.cloudspring-cloud-starter-openfeignorg.springframework.cloudspring-cloud-starter-netflix-ribbon

pom.xml

4.0.0com.momingspring-cloud-root0.0.1-SNAPSHOT../pom.xmlspring-cloud-hystrixorg.springframework.bootspring-boot-starter-weborg.springframework.cloudspring-cloud-starter-netflix-hystrixcom.alibaba.cloudspring-cloud-starter-alibaba-nacos-discoveryorg.springframework.cloudspring-cloud-starter-openfeignorg.springframework.cloudspring-cloud-starter-netflix-ribboncn.hutoolhutool-allorg.projectlomboklomboktruecom.mominguser-api0.0.1-SNAPSHOTcompileorg.springframework.bootspring-boot-maven-pluginorg.projectlomboklombok

相关配置信息

#nacos相关配置
spring.application.name=hystrix-app
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
#新版SpringBoot已不再需要@EnableDiscoveryClient,只需要在pom文件中加入服务发现实现类的maven坐标即可。
#默认true,开启服务自动发现
spring.cloud.discovery.enabled=true#配置feign开启hystrix所有功能
feign.hystrix.enabled=true#Ribbon相关配置
##建立连接的超时时间
ribbon.ConnectionTimeout=5000
##连接成功后,读取资源数据时的超时配置
ribbon.ReadTimeout = 3000

启动类添加注解

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

创建Feign客户端调用a服务,当调用失败时,降级回退到AServerClientFallBack兜底类,执行兜底方法

@FeignClient指定参数fallback=AServerClientFallBack.class

@FeignClient(name = "nacos-a",fallback = AServerClientFallBack.class)
public interface AServerClient extends IUserService {
//##特殊配置key规则为：#(,...)//AServerClient#getSleep(Integer)//public String getSleep(Integer time) ;
}

全局熔断配置同上

对回退兜底类的某个方法设置熔断配置

配置key规则为：

#(,...)

#OpenFeign自定义配置
hystrix.command.AServerClient#getSleep(Integer).metrics.rollingStats.timeInMilliseconds=30000
hystrix.command.AServerClient#getSleep(Integer).fallback.enabled=true
hystrix.command.AServerClient#getSleep(Integer).circuitBreaker.enabled=true
hystrix.command.AServerClient#getSleep(Integer).circuitBreaker.errorThresholdPercentage=50
hystrix.command.AServerClient#getSleep(Integer).circuitBreaker.requestVolumeThreshold=3
hystrix.command.AServerClient#getSleep(Integer).circuitBreaker.sleepWindowInMilliseconds=10000
hystrix.command.AServerClient#getSleep(Integer).execution.isolation.thread.interruptOnFutureCancel=true
hystrix.command.AServerClient#getSleep(Integer).execution.isolation.thread.interruptOnTimeout=true
hystrix.command.AServerClient#getSleep(Integer).execution.isolation.thread.timeoutInMilliseconds=3000
hystrix.command.AServerClient#getSleep(Integer).execution.timeout.enabled=true

AServerClientFallBack

@Component
public class AServerClientFallBack implements AServerClient{@Overridepublic String getName(Integer id) {return null;}@Overridepublic Integer getAmount(Integer id) {return null;}@Overridepublic String getSleep(Integer time) {return "sleep兜底方法";}
}

创建测试接口

@RestController
public class FeignController {@Autowiredprivate AServerClient aServerClient;@GetMapping("/feign/test")public String test(@RequestParam Integer time){return aServerClient.getSleep(time);}
}

访问,模拟熔断