Sentinel源码解析之自动装配和心跳发送_sentinel heartbeat-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_38943725/article/details/121168395

本文深入剖析了Sentinel在Spring Cloud应用中的自动装配过程，详细解释了如何通过spring-cloud-starter-alibaba-sentinel启动器进行配置，并追踪到关键的配置类SentinelWebAutoConfiguration。同时，文章还揭示了Sentinel的心跳发送机制，从CommonFilter的doFilter方法中的SphU.entry调用，到Env.sph.entry的资源初始化和限流、熔断操作，以及HeartbeatSenderInitFunc如何通过SPI加载并定期发送心跳，确保Sentinel控制台能接收到应用的资源信息。

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Sentinel源码解析之自动装配和心跳发送

Sentinel版本

sentinel版本：1.6.3

spring-cloud-alibaba-dependencies版本：2.1.0.RELEASE

自动装配

处理流程

在这里插入图片描述

源码追踪

通过引入spring-cloud-starter-alibaba-sentinel来引入sentinel

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

2.1.0版本的spring-cloud-starter-alibaba-sentinel引入了

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

查看spring-cloud-alibaba-sentinel包里META-INF/spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.alibaba.cloud.sentinel.SentinelWebAutoConfiguration,\
com.alibaba.cloud.sentinel.SentinelWebFluxAutoConfiguration,\
com.alibaba.cloud.sentinel.endpoint.SentinelEndpointAutoConfiguration,\
com.alibaba.cloud.sentinel.custom.SentinelAutoConfiguration,\
com.alibaba.cloud.sentinel.feign.SentinelFeignAutoConfiguration

org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker=\
com.alibaba.cloud.sentinel.custom.SentinelCircuitBreakerConfiguration

其中SentinelWebAutoConfiguration为入口配置类,注入一个拦截器CommonFilter，拦截/*请求。

@Bean
@ConditionalOnProperty(name = "spring.cloud.sentinel.filter.enabled", matchIfMissing = true)
public FilterRegistrationBean sentinelFilter() {
   
   FilterRegistrationBean<Filter> registration = new FilterRegistrationBean<>();

   SentinelProperties.Filter filterConfig = properties.getFilter();

   if (filterConfig.getUrlPatterns() == null
         || filterConfig.getUrlPatterns().isEmpty()) {
   
      List<String> defaultPatterns = new ArrayList<>();
      defaultPatterns.add("/*");
      filterConfig.setUrlPatterns(defaultPatterns);
   }

   registration.addUrlPatterns(filterConfig.getUrlPatterns().toArray(new String[0]));
   Filter filter = new CommonFilter();
   registration.setFilter(filter);
   registration.setOrder(filterConfig.