Controller objects to handle requests. There are many subclasses of Controller that handle common tasks, and you often create your own subclasses of Controller to implement application logic. Most of your logic is implemented in subclasses of ResourceController, a controller type geared for REST API endpoints.ApplicationChannel to configure controllers used by your application. This subclass also initializes any services your application will use to fulfill requests, like database connections or third party API connections. Most often, you use a Router controller at the entry point of your application channel to modularize your application logic.Configuration subclasses that add type and name safety to your configuration files.conduit serve command or the bin/main.dart script. In either case, your application starts by creating multiple, memory-isolated threads that replicate your ApplicationChannel.