internal void SetSessionStateMode(HttpContextBase context, IDynamicSessionStateConfigurator configurator)
{
MvcHandler mvcHandler = context.Handler as MvcHandler;
if (mvcHandler == null)
{
// Either MvcHttpHandler was called directly, Routing hasn't run, or Routing has run
// and the chosen handler isn't MVC. There's nothing we can do here.
return;
}
// Check to see that our factory is installed, otherwise the controller factory might be asked to
// create two instances of the controller for every request, which could lead to resource or
// scalability issues.
RequestContext requestContext = mvcHandler.RequestContext;
MvcDynamicSessionControllerFactory factory = ControllerBuilder.GetControllerFactory() as MvcDynamicSessionControllerFactory;
if (factory == null)
{
throw new InvalidOperationException(String.Format(CultureInfo.CurrentUICulture,
MvcResources.MvcDynamicSessionModule_WrongControllerFactory, typeof(MvcDynamicSessionControllerFactory)));
}
context.Items[_controllerFactoryItemKey] = factory; // save a reference to this factory so that we can dispose of the cached controller
string controllerName = requestContext.RouteData.GetRequiredString("controller");
IController controller = factory.CreateCachedController(requestContext, controllerName);
ControllerSessionState sessionStateMode = GetSessionStateMode(controller);
configurator.ConfigureSessionState(sessionStateMode);
}
public void Init(HttpApplication application)
{
// In ASP.NET 3.5, this works by replacing the original MvcHandler with a new IHttpHandler
// that implements the correct marker interface for the session behavior we wish to support.
// However, in ASP.NET 4, we can't set the Context property because PostMapRequestHandler
// is now too late due to other Routing changes. However, we can detect the presence of new
// ASP.NET 4 Session APIs and call into them if they're available, which mitigates this problem.
application.PostMapRequestHandler += (sender, e) => {
HttpContextBase context = new HttpContextWrapper(((HttpApplication)sender).Context);
IDynamicSessionStateConfigurator configurator = GetSessionStateConfigurator(context);
SetSessionStateMode(context, configurator);
};
application.EndRequest += (sender, e) => {
HttpContextBase context = new HttpContextWrapper(((HttpApplication)sender).Context);
PossiblyReleaseController(context);
};
}
