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POAutofac Multi-tenant IoC Container in an ASP.NET Web API Application
 

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    <p><a href="http://code.google.com/p/autofac" rel="noreferrer">Autofac</a> 3.0 will have a <a href="http://code.google.com/p/autofac/wiki/MultitenantIntegration" rel="noreferrer">MultitenantIntegration</a> support and <a href="http://nuget.org/packages/Autofac.Extras.Multitenant" rel="noreferrer">its preview release is out</a> now. To try it out, I created an ASP.NET Web API application with the following configuration:</p> <pre><code>public class Global : System.Web.HttpApplication { protected void Application_Start(object sender, EventArgs e) { var config = GlobalConfiguration.Configuration; config.Routes.MapHttpRoute("Default", "api/{controller}"); RegisterDependencies(config); } public void RegisterDependencies(HttpConfiguration config) { var builder = new ContainerBuilder(); builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); // creates a logger instance per tenant builder.RegisterType&lt;LoggerService&gt;().As&lt;ILoggerService&gt;().InstancePerTenant(); var mtc = new MultitenantContainer( new RequestParameterTenantIdentificationStrategy("tenant"), builder.Build()); config.DependencyResolver = new AutofacWebApiDependencyResolver(mtc); } } </code></pre> <p>It gets the job done and creates a <code>LoggerService</code> instance as <code>ILoggerService</code> per tenant. I have two problems at this stage which I wasn't able to solve:</p> <ol> <li>I used out of the box provided <code>RequestParameterTenantIdentificationStrategy</code> here as the TenantIdentificationStrategy just for this demo application. I am able to create my custom TenantIdentificationStrategy by implementing <code>ITenantIdentificationStrategy</code> interface. However, <code>TryIdentifyTenant</code> method of the <code>ITenantIdentificationStrategy</code> makes you rely on a static instance such as <code>HttpContext.Current</code> which is something that I don't want in an ASP.NET Web API environment as I want my API to be hosting agnostic (I know that I can delegate this work to the hosting layer but I would rather not to). Is there another way to achieve this in a way that I won't rely on a static instance?</li> <li><p>I also have a chance to register tenant specific instance as below:</p> <pre><code>mtc.ConfigureTenant("tenant1", cb =&gt; cb.RegisterType&lt;Foo&gt;() .As&lt;IFoo&gt;().InstancePerApiRequest()); </code></pre> <p>However, one of my situations requires me to pass the tenant name through the constructor parameter and I would love to have something like below:</p> <pre><code>mtc.ConfigureTenant((cb, tenantName) =&gt; cb.RegisterType&lt;Foo&gt;() .As&lt;IFoo&gt;() .WithParameter("tenantName", tenantName) .InstancePerApiRequest()); </code></pre> <p>Currently there is no such an API. Is there another way to achieve this or this kind of requirement doesn't make any sense?</p></li> </ol>
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