9Nacos配置中心之加載配置客戶端和服務端的處理

9Nacos配置中心之加載配置客戶端和服務端的處理

一 客戶端配置中心之加載配置

prepareContext()方法

applyInitializers()方法

PropertySourceBootstrapConfiguration的initialize()方法

NacosPropertySourceLocator的locate()方法

loadNacosData()方法

ClientWork的getServerConfig()方法

9Nacos配置中心之加載配置客戶端和服務端的處理

一 客戶端配置中心之加載配置

prepareContext()方法

applyInitializers()方法

PropertySourceBootstrapConfiguration的initialize()方法

NacosPropertySourceLocator的locate()方法

loadNacosData()方法

ClientWork的getServerConfig()方法

二 服務端/v1/cs/configs接口的處理

總結

9Nacos配置中心之加載配置客戶端和服務端的處理

一 客戶端配置中心之加載配置

我們接著上個文章說的，Springboot啟動的時候調用prep在reEnvironment()進行環境準備，

prepareEnvironment()進行環境準備，在啟動類執行完prepareEnvironment后，執行prepareContext進行刷新應用上下文件的準備

代碼如下：

public ConfigurableApplicationContext run(String... args) { StopWatch stopWatch = new StopWatch(); stopWatch.start(); ConfigurableApplicationContext context = null; Collection exceptionReporters = new ArrayList<>(); configureHeadlessProperty(); SpringApplicationRunListeners listeners = getRunListeners(args); listeners.starting(); try { ApplicationArguments applicationArguments = new DefaultApplicationArguments( args); //環境準備 ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments); configureIgnoreBeanInfo(environment); Banner printedBanner = printBanner(environment); context = createApplicationContext(); exceptionReporters = getSpringFactoriesInstances( SpringBootExceptionReporter.class, new Class[] { ConfigurableApplicationContext.class }, context); prepareContext(context, environment, listeners, applicationArguments, printedBanner); refreshContext(context); afterRefresh(context, applicationArguments); stopWatch.stop(); if (this.logStartupInfo) { new StartupInfoLogger(this.mainApplicationClass) .logStarted(getApplicationLog(), stopWatch); } listeners.started(context); callRunners(context, applicationArguments); } catch (Throwable ex) { handleRunFailure(context, ex, exceptionReporters, listeners); throw new IllegalStateException(ex); } try { listeners.running(context); } catch (Throwable ex) { handleRunFailure(context, ex, exceptionReporters, null); throw new IllegalStateException(ex); } return context; }

我們看一下prepareContext()準備上下文方法做了什么

prepareContext()方法

private void prepareContext(ConfigurableApplicationContext context, ConfigurableEnvironment environment, SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments, Banner printedBanner) { context.setEnvironment(environment); postProcessApplicationContext(context); applyInitializers(context); listeners.contextPrepared(context); if (this.logStartupInfo) { logStartupInfo(context.getParent() == null); logStartupProfileInfo(context); } // Add boot specific singleton beans ConfigurableListableBeanFactory beanFactory = context.getBeanFactory(); beanFactory.registerSingleton("springApplicationArguments", applicationArguments); if (printedBanner != null) { beanFactory.registerSingleton("springBootBanner", printedBanner); } if (beanFactory instanceof DefaultListableBeanFactory) { ((DefaultListableBeanFactory) beanFactory) .setAllowBeanDefinitionOverriding(this.allowBeanDefinitionOverriding); } // Load the sources Set