springcloud sentinel持久化

1.POM

关键包   sentinel-datasource-nacos  持久化

它的将nacos的配置，加载到sentinel. 所以首先要在nacos上配置限流规则。

如果能够将sentinel 自动保存在nacos上。就更好了。毕竟Sentinel提供了一个UI配置界面。能够更直观的查看配置信息。

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

<dependency>             <groupId>com.alibaba.cloud</groupId>             <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>         </dependency>         <dependency>             <groupId>com.alibaba.csp</groupId>             <artifactId>sentinel-datasource-nacos</artifactId>         </dependency>           <!--openfeign-->         <dependency>             <groupId>org.springframework.cloud</groupId>             <artifactId>spring-cloud-starter-openfeign</artifactId>         </dependency>           <!--nacos-config-->         <dependency>             <groupId>com.alibaba.cloud</groupId>             <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>         </dependency>         <!--nacos-discovery-->         <dependency>             <groupId>com.alibaba.cloud</groupId>             <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>         </dependency>

　2. yml

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

server:   port: 8887   spring:   profiles:     active: dev   application:     name: cloud-consumer-service   cloud:     sentinel:       transport:         dashboard: localhost:8858         port: 8719       datasource:         ds1: #自定义规则的一个标识           nacos:             server-addr: localhost:8848             data-id: cloud-consumer-service             group-id: DEFAULT_GROUP             data-type: json             rule-type: flow #流控

　　

3. 主启动

?

1 2 3 4 5 6 7

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

4. 业务类

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14

@RestController @Slf4j @RequestMapping("consumer") public class SentinelController {         @GetMapping("/testHotKey")     @SentinelResource(value = "testHotKey",blockHandlerClass = CustomerBlockHandler.class, blockHandler = "handlerException")     public CommonResult testHotkey() {           return new CommonResult(200,"success");       } }

4.全局降级处理方法

?

1 2 3 4 5 6 7

public class CustomerBlockHandler {       public  static CommonResult handlerException(BlockException exception){           return new CommonResult(445,exception.getClass().getCanonicalName(),null);     } }

5. nacos 配置

 

 

　

•  resource：资源名称
• limitApp：来源应用
• grade：阀值类型，0表示线程数，1表示QPS
• count：单机阈值
• strategy：流控模式，0表示直接，1表示关联，2表示链路
• controllerBehavior：流控效果，0表示快速失败，1表示Warm up，2表示排队等待
• clusterMode：是否集群

6. sentinel 

启动后，等待一会，看到流控规则

 

com.alibaba.cloud.sentinel.datasource.RuleType：

?

1 2 3 4 5 6 7

FLOW("flow", FlowRule.class), DEGRADE("degrade", DegradeRule.class), PARAM_FLOW("param-flow", ParamFlowRule.class), SYSTEM("system", SystemRule.class), AUTHORITY("authority", AuthorityRule.class), GW_FLOW("gw-flow", "com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayFlowRule"), GW_API_GROUP("gw-api-group", "com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiDefinition");