修改活动配置文件并刷新Spring Boot应用程序中的ApplicationContext运行时 [英] Modify active profiles and refresh ApplicationContext runtime in a Spring Boot application

问题描述

我有一个Spring Boot Web应用程序.使用 @Configurable 注释通过Java类配置应用程序.我介绍了两个配置文件:安装"，正常". 如果安装概要文件处于活动状态，则不会加载任何需要DB连接的Bean. 我想创建一个控制器，用户可以在其中设置数据库连接参数，完成后，我想将活动配置文件从安装"切换为普通"并刷新应用程序上下文，以便Spring可以初始化每个需要的bean数据库数据源.

I have a Spring boot Web application. The application is configured via java classes using the @Configurable annotation. I have introduced two profiles: 'install', 'normal'. If the install profile is active, none of the Beans that require DB connection is loaded. I want to create a controller where the user can set up the db connection parameters and When it's done I want to switch the active profile from 'install' to 'normal' and refresh the application context, so the Spring can init every bean that needs DB data source.

我可以从代码中修改活动配置文件列表，没有问题，但是当我尝试刷新应用程序上下文时，我得到以下例外:

I can modify the list of active profiles from code, without problems, but when i try to refresh the application context, i get the following exception:

`java.lang.IllegalStateException:
 GenericApplicationContext does not support multiple refresh attempts: just call 'refresh' once`

这是我启动Spring引导应用程序的方式:

This is how i boot my Spring boot app:

`new SpringApplicationBuilder().sources(MyApp.class)
.profiles("my-profile").build().run(args);` 

有人知道如何启动Spring Boot应用程序，让您多次刷新应用程序上下文吗?

Does anybody know how to initiate spring boot app that let's you refresh the app context multiple times ?

推荐答案

您不能只是刷新现有上下文.您必须关闭旧的并创建一个新的.您可以在这里查看我们如何在Spring Cloud中做到这一点:

You can't just refresh an existing context. You have to close the old one and create a new one. You can see how we do it in Spring Cloud here: https://github.com/spring-cloud/spring-cloud-commons/blob/master/spring-cloud-context/src/main/java/org/springframework/cloud/context/restart/RestartEndpoint.java. If you want to you can include that Endpoint just by adding spring-cloud-context as a dependency, or you can copy the code I guess and use it in your own "endpoint".

这是端点实现(字段中缺少一些详细信息):

Here's the endpoint implementation (some details missing in fields):

@ManagedOperation
public synchronized ConfigurableApplicationContext restart() {
  if (this.context != null) {
    if (this.integrationShutdown != null) {
      this.integrationShutdown.stop(this.timeout);
    }
    this.application.setEnvironment(this.context.getEnvironment());
    this.context.close();
    overrideClassLoaderForRestart();
    this.context = this.application.run(this.args);
  }
  return this.context;
}

这篇关于修改活动配置文件并刷新Spring Boot应用程序中的ApplicationContext运行时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！