Startup Process and Module Dependency

1. Application Startup Process
   Initialize application configuration, start internal modules, and start other modules.
   The application startup methods include: DubboBootstrap.start(), ApplicationModel.getDeployer().start()
   
2. Module Startup Process
   Starting from ModuleDeployer.start() in the diagram above, automatically initialize application configuration, start internal modules, and then start the current module.
   Module startup methods include:

1. Spring context loads dubbo xml configuration or annotations
2. Manually start the module: ModuleModel.getDeployer().start()

3. Service Interface API Startup
   ServiceConfig.export() or ReferenceConfig.get() first automatically starts the module, and then executes export/refer service interfaces