如何使RavenDB DocumentStore可用于调用API [英] How to make RavenDB DocumentStore available to calling APIs

问题描述

我有一个使用RavenDB作为数据存储的MVC4应用程序.该应用程序具有MVC/Web，域，数据和安全层.

I have an MVC4 application using RavenDB as a datastore. The application has MVC/Web, Domain, Data, and Security layers.

我正在编写需要初始化数据库和访问DocumentStore的自定义成员资格和角色提供程序.我正在从安全性"层编写这些类，并且想使用单例DocumentStore(在应用程序中设置)，但是我不知道如何访问它.

I am writing custom membership and role providers that need to initialize the database and access the DocumentStore. I'm writing these class from the Security layer, and would like to use a singleton DocumentStore (set in the application), but I can't figure out how to access it.

另外，我看到的为RavenDB编写自定义提供程序的示例在Provider.Initialize()方法中创建了新的DocumentStore实例，但这似乎违反了每台服务器只有一个DocumentStore的规则.

Other, examples I see of writing custom providers for RavenDB create new DocumentStore instances within the Provider.Initialize() methods, but that seems to break the rule of having a single DocumentStore per server.

当前，我在Application_Start()中创建RavenDB DocumentStore的单个实例.我在MVC/Web层中有一个用于处理DocumentStore.Session的基本控制器.

Currently, I create a single instance of the RavenDB DocumentStore in Application_Start(). I have a base controller in the MVC/Web layer that handles the DocumentStore.Session(s).

有没有办法做到这一点?我是否应该将安全逻辑移到MVC/Web层以简化操作?

Is there a way of accomplishing this? Should I move my security logic into the MVC/Web layer to simplify things?

推荐答案

我使用单例模式提出了自己的解决方案.

I came up with my own solution using a singleton pattern.

我所做的是在应用程序的数据层中创建一个单例，该单例公开一个公共IDocumentStore属性.它利用静态构造函数，该构造函数在首次请求静态属性时运行(在Application_Start中执行)，然后实例化IDocumentStore对象.然后，对于基础控制器和应用程序其他层(例如安全层f.ex.)中对DocStore.Instance的每次引用，都会返回初始实例.

What I did was create a singleton, that exposes a public IDocumentStore property, in the data layer of my application. It utilizes a static constructor which runs upon first request for static property (executed in Application_Start), and in turn instantiates an IDocumentStore object. The initial instance is then then returned for each reference to DocStore.Instance in a base controller and in other layers of my application (like the security layer f.ex.)

public sealed class DocStore
{
    protected static readonly IDocumentStore instance;

    static DocStore()
    {
        // instantiate documentStore
        instance = new DocumentStore { ConnectionStringName = Constants.ConnectionStrings.XXXXX };
        instance.Initialize();

        // instantiate tenants
        try
        {
            instance.DatabaseCommands.EnsureDatabaseExists(Constants.Tenants.XXXXX);
        }
        catch (Exception ex)
        {

            //TODO: catch exception
            throw ex;
        }

        // initialize indexed
        try
        {
            InitializeIndexes(instance);
        }
        catch (Exception ex)
        {

            //TODO: catch exception
            throw ex;
        }
    }

    private DocStore()
    {

    }

    public static IDocumentStore Instance
    {
        get { return instance; }
    }

    private static void InitializeIndexes(IDocumentStore store)
    {
        // builds all indexes defined in XXXXX.Data.dll
        var dataCatalog = new CompositionContainer(new AssemblyCatalog(typeof(DocStore).Assembly));
        IndexCreation.CreateIndexes(dataCatalog,
                                    store.DatabaseCommands.ForDatabase(Constants.Tenants.XXXXX),
                                    store.Conventions);
    }
}

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