怎么做自己公司的网站,宁波网站的优化,网站开发总跳转至404页面,镇江润州区建设局网站config是一个微服务配置组件#xff0c;为微服务提供集中化的配置管理服务。config包含服务端和客户端#xff0c;客户端在启动服务时从服务端拉取配置信息#xff0c;服务端响应客户端的请求提供具体的配置。本章分析config组件配置信息的拉取过程 1、config服务端
服务端…
config是一个微服务配置组件为微服务提供集中化的配置管理服务。config包含服务端和客户端客户端在启动服务时从服务端拉取配置信息服务端响应客户端的请求提供具体的配置。本章分析config组件配置信息的拉取过程 1、config服务端
服务端响应请求的过程比较简单主要由spring-cloud-config-server包下EnvironmentController负责
RestController
RequestMapping(method {RequestMethod.GET},path {${spring.cloud.config.server.prefix:}}
)
public class EnvironmentController {/*** 根据环境类型和文件名拉取信息**/ RequestMapping(path {/{name}/{profiles:.*[^-].*}},produces {application/json})public Environment defaultLabel(PathVariable String name, PathVariable String profiles) {return this.getEnvironment(name, profiles, (String)null, false);}public Environment getEnvironment(String name, String profiles, String label, boolean includeOrigin) {name this.normalize(name);label this.normalize(label);Environment environment this.repository.findOne(name, profiles, label, includeOrigin);if (this.acceptEmpty || environment ! null !environment.getPropertySources().isEmpty()) {return environment;} else {throw new EnvironmentNotFoundException(Profile Not found);}}}
getEnvironment方法会调用EnvironmentRepository接口的实现类来查找环境信息类似dao层
public interface EnvironmentRepository {Environment findOne(String application, String profile, String label);default Environment findOne(String application, String profile, String label, boolean includeOrigin) {return this.findOne(application, profile, label);}
}2、config客户端
springboot在启动时会调用applyInitializers方法这个方法会遍历ApplicationContextInitializer接口的实现类并调用它们的initialize方法
【SpringBoot】SpringBoot源码解析第二章 SpringBoot的run方法-CSDN博客
protected void applyInitializers(ConfigurableApplicationContext context) {for (ApplicationContextInitializer initializer : getInitializers()) {Class? requiredType GenericTypeResolver.resolveTypeArgument(initializer.getClass(),ApplicationContextInitializer.class);Assert.isInstanceOf(requiredType, context, Unable to call initializer.);initializer.initialize(context);}
}
config客户端中的PropertySourceBootstrapConfiguration类实现了ApplicationContextInitializer接口它的工作就是拉取远程的配置信息并与本地信息整合 public void initialize(ConfigurableApplicationContext applicationContext) {...while(true) {Collection source;do {do {...PropertySourceLocator locator (PropertySourceLocator)var5.next();// 拉取远程配置信息source locator.locateCollection(environment);} while(source null);} while(source.size() 0);...}}
ConfigServicePropertySourceLocator是PropertySourceLocator接口的实现类查看它的locate方法
Retryable(interceptor configServerRetryInterceptor
)
public PropertySource? locate(Environment environment) {...for(int var11 0; var11 var10; var11) {String label var9[var11];...// 发送请求org.springframework.cloud.config.environment.Environment result this.getRemoteEnvironment(restTemplate, properties, label.trim(), state);...}
}private Environment getRemoteEnvironment(RestTemplate restTemplate, ConfigClientProperties properties, String label, String state) {String path /{name}/{profile};String name properties.getName();String profile properties.getProfile();String token properties.getToken();...response restTemplate.exchange(uri path, HttpMethod.GET, entity, org.springframework.cloud.config.environment.Environment.class, args);...}
}
locate方法发送具体的请求拉取过来的远程信息会被整合入本地 3、总结
config服务端负责响应请求config客户端在服务启动时会从服务端拉取配置信息
