/// <summary>
/// Initializes a new instance of the <see cref="ApplicationBase"/> class.
/// </summary>
/// <param name="startupModuleType">Type of the startup module.</param>
/// <param name="services">The services.</param>
/// <param name="optionsAction">The options action.</param>
internal ApplicationBase(
[NotNull] Type startupModuleType,
[NotNull] IServiceCollection services,
[CanBeNull] Action <ApplicationCreationOptions> optionsAction)
{
Check.NotNull(startupModuleType, nameof(startupModuleType));
Check.NotNull(services, nameof(services));
StartupModuleType = startupModuleType;
Services = services;
//ObjectAccessor采用头插法，放入其中的查找较快。 AddObjectAccessor一注册注册一对儿：ObjectAccessor；IObjectAccessor
services.TryAddObjectAccessor <IServiceProvider>();
var options = new ApplicationCreationOptions(services);
optionsAction?.Invoke(options);
// 当前的 Application 就是一个模块容器。
services.AddSingleton <IApplication>(this);
services.AddSingleton <IModuleContainer>(this);
//核心基本服务 Options Logging Localization
services.AddCoreServices();
// 注入模块加载类，以及模块的四个应用程序生命周期。
services.AddAppCoreServices(this, options);
//遍历所有模块，并按照预加载、初始化、初始化完成的顺序执行其生命周期方法。
Modules = LoadModules(services, options);
}
/// <summary>
/// Uses the autofac.
/// </summary>
/// <param name="options">The options.</param>
public static void UseAutofac(this ApplicationCreationOptions options)
{
var builder = new ContainerBuilder();
options.Services.AddObjectAccessor(builder);
options.Services.AddSingleton((IServiceProviderFactory <ContainerBuilder>) new AutofacServiceProviderFactory(builder));
}
/// <summary>
/// Loads the modules.
/// </summary>
/// <param name="services">The services.</param>
/// <param name="options">The options.</param>
/// <returns>IReadOnlyList<IModuleDescriptor>.</returns>
private IReadOnlyList <IModuleDescriptor> LoadModules(IServiceCollection services, ApplicationCreationOptions options)
{
return(services
.GetSingletonInstance <IModuleLoader>()
.LoadModules(
services,
StartupModuleType,
options.PlugInSources
));
}
