Spring Cloud入门系列(二十二)- Spring Cloud Alibaba之服务熔断与限流Sentinel
新建模块 cloud-alibaba-sentinel-service8401
pom.xml内容如下
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>cloud201230</artifactId>
<groupId>com.banana</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-alibaba-sentinel-service8401</artifactId>
<dependencies>
<!-- nacos config -->
<!-- <dependency>-->
<!-- <groupId>com.alibaba.cloud</groupId>-->
<!-- <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>-->
<!-- </dependency>-->
<!-- SpringCloud alibaba nacos -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!--后续做持久化用到-->
<dependency>
<groupId>com.alibaba.csp</groupId>
<artifactId>sentinel-datasource-nacos</artifactId>
</dependency>
<!--sentinel-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
<!--openfeign -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<!--web组件-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--引入自定义的api通用包-->
<dependency>
<groupId>com.banana</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
application.yml
server:
port: 8401
spring:
application:
name: alibaba-sentinel-service
cloud:
nacos:
discovery:
#Nacos注册中心地址
server-addr: localhost:8848
sentinel:
transport:
#配置Sentinel dashboard地址
dashboard: localhost:8080
#默认8719端口,假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口
port: 8719
datasource:
dsl:
nacos:
server-addr: localhost:8848
dataId: alibaba-sentinel-service
groupId: DEFAULT_GROUP
data_type: json
rule-type: flow
management:
endpoints:
web:
exposure:
include: "*"
SentinelMain8401
package com.banana.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
/**
* @author layman
* @date 2021/1/24
*/
@SpringBootApplication
@EnableDiscoveryClient
public class SentinelMain8401 {
public static void main(String[] args) {
SpringApplication.run(SentinelMain8401.class,args);
}
}
CustomerBlockHandler
package com.banana.springcloud.myhandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.banana.springcloud.entity.CommonResult;
/**
* @author layman
* @description: TODO
* @date 2021/10/24
*/
public class CustomerBlockHandler {
public static CommonResult handlerException(BlockException exception) {
return new CommonResult(4444, "按客戶自定义,global handlerException----1");
}
public static CommonResult handlerException2(BlockException exception) {
return new CommonResult(4444, "按客戶自定义,global handlerException----2");
}
}
FlowLimitController
package com.banana.springcloud.controller;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.concurrent.TimeUnit;
/**
* @author layman
* @date 2021/1/24
*/
@RestController
@Slf4j
public class FlowLimitController {
@GetMapping("/testA")
public String testA() {
// 测试阈值类型:线程数
/*try {
TimeUnit.MILLISECONDS.sleep(800);
} catch (InterruptedException e) {
e.printStackTrace();
}*/
return "------testA";
}
@GetMapping("/testB")
public String testB() {
log.info(Thread.currentThread().getName() + "\t" + "...testB");
return "------testB";
}
@GetMapping("/testC")
public String testC() {
log.info("testC 异常比例");
int age = 10 / 0;
return "------testC";
}
@GetMapping("/testD")
public String testD() {
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
log.info("testD 测试RT");
return "------testD";
}
@GetMapping("/testE")
public String testE() {
log.info("testE 测试异常数");
int age = 10 / 0;
return "------testE 测试异常数";
}
/**
* 热点限流
*/
@GetMapping("/testHotKey")
@SentinelResource(value = "testHotKey", blockHandler = "deal_testHotKey")
public String testHotKey(@RequestParam(value = "p1", required = false) String p1,
@RequestParam(value = "p2", required = false) String p2) {
int age = 10 / 0;
return "------testHotKey";
}
public String deal_testHotKey(String p1, String p2, BlockException exception) {
//sentinel系统默认的提示:Blocked by Sentinel (flow limiting)
return "------deal_testHotKey,o(╥﹏╥)o";
}
}