一、hystrix

hystrix主要實現(xiàn)熔斷和隔離，限流的功能基本沒有，通過fallback實現(xiàn)服務(wù)降級和快速失敗。核心是HystrixCommand。配置主要包含exection、fallback、circuitBreaker、metric、threadPool等。

二、加入依賴包

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix</artifactId><version>1.4.7.RELEASE</version> </dependency> <dependency><groupId>com.netflix.hystrix</groupId><artifactId>hystrix-javanica</artifactId> </dependency>

三、在application.yml中加入配置

feign: hystrix: enabled: truehystrix:command:default:execution:timeout:enabled: trueisolation:strategy: THREADthread:timeoutInMilliseconds: 8000interruptOnTimeout: trueinterruptOnCancel: truefallback:enabled: trueisolation:semaphore:maxConcurrentRequests: 2

四、在訪問接口上實現(xiàn)熔斷、隔離和服務(wù)降級

@HystrixCommand(commandKey = "circuitBreakerCommand",threadPoolKey = "circuitBreakerPool",fallbackMethod = "circuitBreakerFallbackMethod",commandProperties = {@HystrixProperty(name = "circuitBreaker.enabled", value = "true"),@HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "2"),@HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),@HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "5000")}, threadPoolProperties = {@HystrixProperty(name = "coreSize", value = "5") })@GetMapping("/circuitBreakerHello/{id}")public String circuitBreakerHello(@PathVariable("id") int id) {if(id==2){throw new RuntimeException("exception");}return "sucessful execution" ;}public String circuitBreakerFallbackMethod(int id) {return "param "+id+" is wrong. circuitBreaker has been valid"; }

五、啟動類上添加@EnableHystrix

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class}) @EnableDiscoveryClient @EnableFeignClients @EnableHystrix @MapperScan("com.sboot.dao") public class ConsulConsumerApplication {public static void main(String[] args) {SpringApplication.run(ConsulConsumerApplication.class, args);} }

六、測試

1、在瀏覽器中多次刷新如下地址，導(dǎo)致熔斷打開

2、當訪問正常得路徑http://localhost:8082/circuitBreakerHello/1，也走服務(wù)降級：

3、過一會，過了休眠期，再訪問正常路徑，可以正常訪問

總結(jié)

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