asp.net-mvc-3 - SignalR + 依赖注入(inject)问题

Question

我在我的 MVC3 应用程序中使用 SignalR，并且由于我已经在我的 Controller 上实现了 StructureMap 依赖注入(inject)，我想在我的集线器中执行相同的操作，但我似乎无法让它工作。

请告诉我下面的代码有什么问题:

SignalRSmDependencyResolver.cs

public class SignalRSmDependencyResolver : DefaultDependencyResolver
{
    private IContainer _container;

    public SignalRSmDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public override object GetService(Type serviceType)
    {
        object service = null;
        if (!serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass)
        {
            // Concrete type resolution
            service = _container.GetInstance(serviceType);
        }
        else
        {
            // Other type resolution with base fallback
            service = _container.TryGetInstance(serviceType) ?? base.GetService(serviceType);
        }
        return service;
    }

    public override IEnumerable<object> GetServices(Type serviceType)
    {
        var objects = _container.GetAllInstances(serviceType).Cast<object>();
        objects.Concat(base.GetServices(serviceType));
        return objects;
    }
}

SignalRExtensionsRegistry.cs

public class SignalRExtensionsRegistry : Registry
{
    public SignalRExtensionsRegistry()
    {
        For<IDependencyResolver>().Add<SignalRSmDependencyResolver>();
    }
}

IoC.cs

public static class IoC {
    public static IContainer Initialize() {

        var container = BootStrapper.Initialize();

        container.Configure(x =>
        {
            x.For<IControllerActivator>().Singleton().Use<StructureMapControllerActivator>();
        });

        return container;
    }
}

public class StructureMapControllerActivator : IControllerActivator {
    public StructureMapControllerActivator(IContainer container) {
        _container = container;
    }

    private IContainer _container;

    public IController Create(RequestContext requestContext, Type controllerType) {
        IController controller = DependencyResolver.Current.GetService(controllerType) as IController;
        return controller;
    }
}

AppStart_Structuremap.cs

[assembly: WebActivator.PreApplicationStartMethod(typeof(StoreUI.AppStart_Structuremap), "Start")]

namespace MyNameSpace {
public static class AppStart_Structuremap {
    public static void Start() {
        var container = (IContainer) IoC.Initialize();
        DependencyResolver.SetResolver(new StructureMapDependenceyResolver(container));
        AspNetHost.SetResolver(new StructureMapDependencyResolver(container));            
    }
}
}

NotificationsHub.cs

[HubName("notificationsHub")]
public class NotificationsHub : Hub
{    
    #region Declarations
    private readonly IUserService userService;
    #endregion

    #region Constructor

    public NotificationsHub(IUserService userService)
    {
        this.userService = userService;
    }

    #endregion

    public void updateServer(string message)
    {
        Clients.updateClient(message);
    }
}

谢谢

Answer 1

将 Structuremap 导入 SignalR 实际上非常简单。首先，您要创建自己的解析器:

结构图解析器

用途:

using SignalR.Infrastructure;
using StructureMap;

类(class):

public class StructureMapResolver : DefaultDependencyResolver
{
    private IContainer _container;

    public StructureMapResolver(IContainer container)
    {
        _container = container;
    }

    public override object GetService(Type serviceType)
    {
        object service = null;
        if (!serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass)
        {
            // Concrete type resolution
            service = _container.GetInstance(serviceType);
        }
        else
        {
            // Other type resolution with base fallback
            service = _container.TryGetInstance(serviceType) ?? base.GetService(serviceType);
        }
        return service;
    }

    public override IEnumerable<object> GetServices(Type serviceType)
    {
        var objects = _container.GetAllInstances(serviceType).Cast<object>();
        return objects.Concat(base.GetServices(serviceType));
    }
}

这里的想法是尝试使用您的容器来解析依赖项，如果您没有连接依赖项，请将其传递给默认解析器。这样您就不必担心 SignalR 中的所有其他依赖项，而可以只关注您想要注入(inject)的内容(集线器、ConnectionIdFactory、MessageBus 等)。

解析器和集线器的绑定(bind)

接下来，您需要在容器中注册它(我喜欢使用注册表):

用途:

using SignalR.Infrastructure;
using StructureMap.Configuration.DSL;

类(class):

public class ExtensionsRegistry : Registry
{
    public ExtensionsRegistry()
    {
        For<IDependencyResolver>().Add<StructureMapResolver>();
    }
}

旋转变压器更换

最后，您需要告诉 SignalR 使用您的解析器而不是默认解析器:

Global::Application_Start 或 WebActivator::Pre_Start

用途:

using SignalR.Hosting.AspNet;
using SignalR.Infrastructure;

Application_Start:

// Make sure you build up the container first
AspNetHost.SetResolver(StructureMap.ObjectFactory.GetInstance<IDependencyResolver>());

带有注入(inject)依赖项的愚蠢集线器

现在您可以将容器知道的任何依赖项注入(inject)集线器本身:

[HubName("defaultHub")]
public class DefaultHub : Hub, IDisconnect
{
    private readonly IRepository _repo;
    public DefaultHub(IRepository repo)
    {
        _repo = repo;
    }

    public void Connect()
    {
        Caller.setUser(Context.ConnectionId);
        Clients.addMessage(string.Format("{0} has connected", Context.ConnectionId));
    }

    public void MessageSender(string message)
    {
        Caller.addMessage(_repo.RepositoryMessage());
        Clients.addMessage(message);
    }

    public Task Disconnect()
    {
        var clientId = this.Context.ConnectionId;
        return Task.Factory.StartNew(() => { Clients.addMessage(string.Format("{0} has disconnected", clientId)); });
    }
}