alibaba(sentinel服务熔断，服务降级)

需要安装sentinel
https://github.com/alibaba/Sentinel/releases/download/1.6.3/sentinel-dashboard-1.6.3.jar
pom.xml

  <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
  </dependency>

server:
  port: 8401
spring:
  application:
    name: cloudalibaba-sentinel-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #Nacos服务注册中心地址
    sentinel:
      transport:
        dashboard: localhost:8080 #配置Sentinel dashboard地址
        port: 8719
      datasource:
        ds1:
          nacos:
            server-addr: localhost:8848
            dataId: ${spring.application.name}
            groupId: DEFAULT_GROUP
            data-type: json
            rule-type: flow
management:
  endpoints:
    web:
      exposure:
        include: '*'

不需要在启动类上加注解

用@sentinelResource(value=”fallback” fallback=”handlerFallback”)

blockHandler只负责控制台配置违规，也就是说如果设置了调用次数，那超出调用次数就执行blockHandler设置的方法

如果有业务违规和控制台配置的参数超过，那会执行blockHandler设置的方法

feing 集成 sentinel: