How to realize the automatic assembly of the GIN (GWT Injection) framework to rely on injection

Gin (GWT Injection) is a dependent injection (DI) framework for Google Web Toolkit (GWT) applications.It helps developers to implement the function of automatically injection dependency in GWT applications, thereby simplifying the development and maintenance process of the application. To understand how the GIN framework realizes automatic assembly dependency injection, we need to understand the following concepts and terms: 1. Component (Widget): The construction block of the GWT application is similar to the controls in other UI frameworks. 2. Widget Injection: The process of injecting the dependencies into the component. 3. Binding: Bind an instance of one class to an instance of another class in order to automatically inject when needed. 4. Dependency: One class depends on an instance of another class to complete specific functions. The GIN framework realizes the automatic assembly that depends on the injection through the following steps: 1. Define module (module): Create a module class that inherits from `com.google.gwt.inject.client.abstractginmodule`.This class is responsible for defining dependencies and binding rules.In the module class, you can use the `bind ()` method to bind an instance of one class to an instance of another class. public class MyModule extends AbstractGinModule { @Override protected void configure() { bind(Service.class).to(ServiceImplementation.class); bind(Repository.class).to(RepositoryImplementation.class); bind(Presenter.class).to(PresenterImplementation.class); } } In the above examples, the `Service` class is bound to the` ServiceImplementation` class, and the `repository` class to the` repositoryimplementation` class, and the `Presenter" class to the `PresentedErimplementation`. 2. Create Injector: Use the implementation class of the implementation class of `com.google.gwt.inject.client.gininjector` to create an injection instance.Injector is a key component that allows developers to access and use the dependency injecting function. public class MyApp implements EntryPoint { private final Injector injector = GWT.create(Injector.class); public void onModuleLoad() { // Use an injector to get a Presenter instance Presenter presenter = injector.getPresenter(); // You can use the Presenter instance to perform other operations ... } } In the above example, use the implementation class of the `gwt.create ()` method and the implementation class of the `Injector` interface to create an injector instance.Then, by calling the `Getpresenter ()" method, use an injectionter to obtain an instance of `Presenter`. 3. Component injection: Use the `@inject` annotation to rely on the bid dependency relationship in the component that needs to be relying on, and use the method to inject the dependent relationship into the component. public class Presenter { @Inject private Service service; public void doSomething() { // You can use the service instance to operate ... } } public class MyApp implements EntryPoint { private final Injector injector = GWT.create(Injector.class); public void onModuleLoad() { Presenter presenter = new Presenter(); // Inject the dependencies into the Presenter instance injector.injectMembers(presenter); presenter.doSomething(); } } In the above example, by marking the `@inject` in the` Service` field in the `Presenter` class, the instance of the` Service` class is automatically injected into the `Presenter` class.Then, you can use the `InjectMembers () method to inject the dependency into the` Presenter` instance. Through the above steps, the GIN framework realizes automatic assembly that depends on injection.Developers only need to define modules, binding rules and dependencies, and then use the injection device to inject the dependent relationship into the component.In this way, developers can focus more on the realization of business logic without the need to create and initialize the creation and initialization of manual management dependencies.