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# Sentinel Feign Circuit Breaker Example
## 项目说明
OpenFeign 整合 Sentinel 断路器实现
## 示例
1. 添加配置到配置中心
dataId 为 `sentinel-circuitbreaker-rules.yml`
```yaml
feign :
circuitbreaker :
enabled : true # 开启 feign 断路器支持
sentinel :
default-rule : default # 默认规则名称
rules :
# 默认规则, 对所有 feign client 生效
default :
- grade : 2 # 根据异常数目降级
count : 1
timeWindow : 15 # 降级后到半开状态的时间
statIntervalMs : 1000
minRequestAmount : 1
# 只对 feign client user 生效
user :
- grade : 2
count : 1
timeWindow : 15
statIntervalMs : 1000
minRequestAmount : 1
# 只对 feign client user 的方法 feignMethod 生效
# 括号里是参数类型, 多个逗号分割, 比如 user#method(boolean,String,Map)
"[user#feignMethod(boolean)]" :
- grade : 2
count : 1
timeWindow : 10
statIntervalMs : 1000
minRequestAmount : 1
```
2. 启动 FeignCircuitBreakerApplication
## 验证配置生效
验证默认 feign client 生效
先访问 http://localhost/test/default/false 2 次 （ ）
再访问 http://localhost/test/default/true 断路器处于打开状态
验证指定 feign client 生效
先访问 http://localhost/test/feign/false 2 次 （ ）
再访问 http://localhost/test/feign/true 断路器处于打开状态
验证 feign client 指定方法生效
先访问 http://localhost/test/feignMethod/false 2次 （ ）
再访问 http://localhost/test/feignMethod/true 断路器处于打开状态
## 规则动态刷新