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Looking for a Ninject scope that behaves like InRequestScope

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庸人自扰
庸人自扰 2020-11-28 16:32

On my service layer I have injected an UnitOfWork and 2 repositories in the constructor. The Unit of Work and repository have an instance of a DbContext

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  • 甜味超标
    甜味超标 (楼主)
    2020-11-28 17:10

    As discussed in the other answer, InCallScope is not a good approach to solving this problem.

    For now I'm dumping some code that works against the latest NuGet Unstable / Include PreRelease / Instal-Package -Pre editions of Ninject.Web.Common without a clear explanation. I will translate this to an article in the Ninject.Extensions.NamedScope wiki at some stagehave started to write a walkthrough of this technique in the Ninject.Extensions.NamedScope wiki's CreateNamedScope/GetScope article.

    Possibly some bits will become Pull Request(s) at some stage too (Hat tip to @Remo Gloor who supplied me the outline code). The associated tests and learning tests are in this gist for now), pending packaging in a proper released format TBD.

    The exec summary is you Load the Module below into your Kernel and use .InRequestScope() on everything you want created / Disposed per handler invocation and then feed requests through via IHandlerComposer.ComposeCallDispose.

    If you use the following Module:

    public class Module : NinjectModule
{
    public override void Load()
    {
        Bind().To();

        // Wire it up so InRequestScope will work for Handler scopes
        Bind().To();
        NinjectRequestHandlerScopeFactory.NinjectHttpApplicationPlugin.RegisterIn( Kernel );
    }
}

    Which wires in a Factory[1] and NinjectHttpApplicationPlugin that exposes:

    public interface INinjectRequestHandlerScopeFactory
{
    NamedScope CreateRequestHandlerScope();
}

    Then you can use this Composer to Run a Request InRequestScope():

    public interface IHandlerComposer
{
    void ComposeCallDispose( Type type, Action callback );
}



    Implemented as:
    


    class NinjectRequestScopedHandlerComposer : IHandlerComposer
{
    readonly INinjectRequestHandlerScopeFactory _requestHandlerScopeFactory;

    public NinjectRequestScopedHandlerComposer( INinjectRequestHandlerScopeFactory requestHandlerScopeFactory )
    {
        _requestHandlerScopeFactory = requestHandlerScopeFactory;
    }

    void IHandlerComposer.ComposeCallDispose( Type handlerType, Action callback )
    {
        using ( var resolutionRoot = _requestHandlerScopeFactory.CreateRequestHandlerScope() )
            foreach ( object handler in resolutionRoot.GetAll( handlerType ) )
                callback( handler );
    }
}



    The Ninject Infrastructure stuff:
    


    class NinjectRequestHandlerScopeFactory : INinjectRequestHandlerScopeFactory
{
    internal const string ScopeName = "Handler";

    readonly IKernel _kernel;

    public NinjectRequestHandlerScopeFactory( IKernel kernel )
    {
        _kernel = kernel;
    }

    NamedScope INinjectRequestHandlerScopeFactory.CreateRequestHandlerScope()
    {
        return _kernel.CreateNamedScope( ScopeName );
    }

    /// 
    /// When plugged in as a Ninject Kernel Component via RegisterIn(IKernel), makes the Named Scope generated during IHandlerFactory.RunAndDispose available for use via the Ninject.Web.Common's .InRequestScope() Binding extension.
    /// 
    public class NinjectHttpApplicationPlugin : NinjectComponent, INinjectHttpApplicationPlugin
    {
        readonly IKernel kernel;

        public static void RegisterIn( IKernel kernel )
        {
            kernel.Components.Add();
        }

        public NinjectHttpApplicationPlugin( IKernel kernel )
        {
            this.kernel = kernel;
        }

        object INinjectHttpApplicationPlugin.GetRequestScope( IContext context )
        {
            // TODO PR for TrgGetScope
            try
            {
                return NamedScopeExtensionMethods.GetScope( context, ScopeName );
            }
            catch ( UnknownScopeException )
            {
                return null;
            }
        }

        void INinjectHttpApplicationPlugin.Start()
        {
        }

        void INinjectHttpApplicationPlugin.Stop()
        {
        }
    }
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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