Interpretation of the technical principles of the ScalDi framework in the Java class library

The SCALDI framework is a Lightweight dependencies injection (DI) framework based on the SCALA language. It provides a simple and flexible way to manage and solve the dependency relationship in the Java class library.In the ScalDi framework, there are some technical principles that need to be understood and mastered. 1. Explicit binding: ScalDi encourages developers to bind dependencies in a formula.This means that when using dependency injection, it is necessary to clearly define the binding relationship of dependencies.By explicit binding, we can use corresponding injection strategies inside the framework for resolution. The following is a simple explicit binding example: val injector = new MutableInjector().bind[Dependency].to[ConcreteDependency] In the above example, we bind the `Dependency` to the specific implementation of` ConcreteDependency`. 2. inert injection: ScalDi uses inertia injection to handle the creation and analysis of dependencies.This means that only when the dependence is needed can it be created and analyzed.An inertia injection can improve the performance and resource utilization rate of the application. Below is an inert injection example: class MyClass @Inject() (lazyDependency: => Dependency) { // ... } In the above examples, we use the `lazydependency` as the constructive function parameter to achieve inertia injection. 3. Life cycle management: ScalDi allows developers to define and manage the life cycle of dependency items.You can limit the dependency item as a single case (Singleton) or every request to create a new instance (Prototype).Through the life cycle management, we can ensure that the dependency items are created and destroyed at appropriate time. The following is an example of life cycle management: class SingletonDependency extends Injectable { bind [Dependency] to new SingletonDependency } In the above example, we created a single example `Singletondependency`, which will be bound to an instance of` Dependency`. In summary, the technical principles of the SCALDI framework include explicit binding, inert injection and life cycle management.By following these principles, we can better manage and solve the dependency relationship in the Java class library, and improve the maintenance and scalability of code.