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SignalR + Dependency Injection Questions

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醉酒成梦
醉酒成梦 2020-12-29 23:47

I am using SignalR in my MVC3 application, and since I have implemented StructureMap Dependency Injection on my controllers I would like to do the same in my hub, but I can\

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  • 时光取名叫无心
    时光取名叫无心 (楼主)
    2020-12-30 00:32

    Getting Structuremap into SignalR is actually pretty easy. First you want to create your own resolver:

    StructureMap Resolver

    Usings:

    using SignalR.Infrastructure;
using StructureMap;

    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 GetServices(Type serviceType)
    {
        var objects = _container.GetAllInstances(serviceType).Cast();
        return objects.Concat(base.GetServices(serviceType));
    }
}



    The idea here is to try and use your container to resolve the dependencies, if you do not have the dependency wired up, pass it through to the default resolver. This way you don't have to worry about all of the other dependencies in SignalR and can focus only on the stuff you want to inject into (Hubs, ConnectionIdFactory, MessageBus, etc.).
    


    Bindings for Resolver and Hub
    


    Next you will want to register this in your container (i like using registries):
    


    Usings:
    


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

    


    Class:
    


    public class ExtensionsRegistry : Registry
{
    public ExtensionsRegistry()
    {
        For().Add();
    }
}

    


    Resolver Replacement
    


    Finally you will want to tell SignalR to use your resolver instead of the default:
    


    Global::Application_Start or WebActivator::Pre_Start
    


    Usings:
    


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

    


    Application_Start:
    


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

    


    Silly Hub with injected dependencies
    


    Now you can just inject any dependencies your container knows about into the hubs themselves:
    


    [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)); });
    }
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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