Introduction

We know that IOC(Inversion of Control) is an effective architectural design for system decoupling, and is also a supporting tool for the development of large-scale business systems

IOC Containers

There are two types of ioc containers in Vona:

1. global ioc container(referred to as app container): During system initialization, a unique global bean container will be automatically created. Bean instances created in this container are all singleton mode
2. request ioc container(referred to as ctx container): When requests coming, the system will create a bean container for each of them

Bean Class

Vona adopts a modular system, and Bean Classes are provided by different modules. When using the Bean Class inside the same module, you can directly resolve it based on Class type. When using cross-module, you can resolve it based on Bean identifier instead of Class type/file path, which is conducive to achieving loose coupling between modules

Injection Scope

Vona provides the following injection scopes:

1. app: Inject in the app container

2. ctx: Inject in the ctx container

3. new: Always create a new bean instance

Injection method

Vona provides two injection methods:

1. Dependency injection: Provides attribute-based dependency injection through the @Use decorator

2. Dependency lookup: Directly lookup the required bean instance through the ioc container, and automatically create it if it does not exist