对象肯定比单例好，但是对于真正的横切关注点（即，日志记录等），您可能需要考虑将这些单例修改为AmbientContext模式。它基本上是一个类固醇的单例，但您可以在应用程序/测试启动时将其示例化为您选择的接口实现。这将使记录器完全可测试，同时不会导致您必须将它们注入到所有内容中。环境上下文也可以作为一个临时的中间地带，允许测试，以避免在进行中重构所...
Introduction to Contexts and Dependency Injection (CDI)cn.quarkus.io/guides/cdi#bean-scope-avail...
Don't you think the dependency injection framework needs a singleton type? I checked the documentation and as I can see there is no option for creating a class as a singleton. If I want to pass in a class as a dependency it will be created every time. So a feature to create ...
I agree. In nestjs, DI (Dependency Injection) is performed based on the type of the arguments, regardless of the order of the arguments. Therefore, even if you change the order of receiving AService and IDatabaseProvider arguments in the BService class constructor, DI should be performed corr...
Others reserve “dependency injection” for more complex ways of providing dependencies to code. Consider a function for rendering objects. In order to render, it needs access to an object that represents the graphics device and maintains the render state. It’s very common to simply pass that ...
Java 9 Dependency Injection by Krunal Patel, Nilang Patel Eager singletons Guice provides special syntax for making an object that has the singleton scope, and is initialized to eager mode rather than lazy mode. Following is the syntax: bind(NotificationService.class).to(SMSService.class).as...
Suppose that the User sent a request -> WebApplication -> DI Engine. DI Engine will create and send objects based on the dependency injection life cycle. As per the above diagram, the User sends three requests to WebApplication -> DI Engine, and DI Engine always responds to the same obje...
In this article, you will learn about AddTransient Vs AddScoped Vs AddSingleton In ASP.NET Core. Dependency Injection (DI) in ASP.NET Core, focusing on service lifetimes: Transient, Scoped, and Singleton. It details their configurations and usage scenari
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Adds a singleton service of the type specified in serviceType with an instance specified in implementationInstance to the specified IServiceCollection. AddSingleton(IServiceCollection, Type, Type) Adds a singleton service of the type specified in serviceType with...