abp模块生命周期设计思路剖析

Posted 2022-12-26 zhiyong-itnote

abp中将生命周期事件抽象为4个接口：

//预初始化
public interface IOnPreApplicationInitialization

    void OnPreApplicationInitialization([NotNull] ApplicationInitializationContext context);


//初始化
public interface IOnApplicationInitialization

    void OnApplicationInitialization([NotNull] ApplicationInitializationContext context);


//初始化完成
public interface IOnPostApplicationInitialization

    void OnPostApplicationInitialization([NotNull] ApplicationInitializationContext context);


//关闭
public interface IOnApplicationShutdown

    void OnApplicationShutdown([NotNull] ApplicationShutdownContext context);

abp定义了一个模块生命周期接口，该接口只有两个方法，用于初始化和关闭。

public interface IModuleLifecycleContributor : ITransientDependency

    void Initialize([NotNull] ApplicationInitializationContext context, [NotNull] IAbpModule module);

    void Shutdown([NotNull] ApplicationShutdownContext context, [NotNull] IAbpModule module);

这个接口的参数是IAbpModule接口的类型，也就是派生自AbpModule的模块类型。该接口有一个默认实现，是一个抽象类，主要是用于复用。

public abstract class ModuleLifecycleContributorBase : IModuleLifecycleContributor

    public virtual void Initialize(ApplicationInitializationContext context, IAbpModule module)
    
    

    public virtual void Shutdown(ApplicationShutdownContext context, IAbpModule module)
    
    

abp根据四个生命周期分别有四个类型，这四个类型是基于模块生命周期基类创建的。

public class OnApplicationInitializationModuleLifecycleContributor : ModuleLifecycleContributorBase

    public override void Initialize(ApplicationInitializationContext context, IAbpModule module)
    
        (module as IOnApplicationInitialization)?.OnApplicationInitialization(context);
    


public class OnApplicationShutdownModuleLifecycleContributor : ModuleLifecycleContributorBase

    public override void Shutdown(ApplicationShutdownContext context, IAbpModule module)
    
        (module as IOnApplicationShutdown)?.OnApplicationShutdown(context);
    


public class OnPreApplicationInitializationModuleLifecycleContributor : ModuleLifecycleContributorBase

    public override void Initialize(ApplicationInitializationContext context, IAbpModule module)
    
        (module as IOnPreApplicationInitialization)?.OnPreApplicationInitialization(context);
    


public class OnPostApplicationInitializationModuleLifecycleContributor : ModuleLifecycleContributorBase

    public override void Initialize(ApplicationInitializationContext context, IAbpModule module)
    
        (module as IOnPostApplicationInitialization)?.OnPostApplicationInitialization(context);
    

只有"关闭应用"这个生命周期实现Shutdown方法，其余的都是实现Initialize方法。最后是传入的参数abp模块去调用对应的生命周期。
剖析图如下：