public HttpControllerDescriptor SelectController(HttpRequestMessage request)
{
Throw.IfArgumentNull(request, "request");
// reset version for each request
this.Version = null;
// set a default version if not already set
//if (string.IsNullOrEmpty(this.DefaultVersion))
//{
// // extract 'area' route value if requested
// string area = string.Empty;
// var routeData = request.GetRouteData();
// if (routeData != null && routeData.Values.ContainsKey("area") && routeData.Values["area"] != null)
// area = routeData.Values["area"].ToString();
// this.DefaultVersion = this.GetVersions(area).Count() > 0 ? this.GetVersions(area).First() : null;
//}
ControllerIdentification controllerName = this.GetControllerIdentificationFromRequest(request);
if (String.IsNullOrEmpty(controllerName.Name))
{
Throw.HttpResponse(request.CreateErrorResponse(HttpStatusCode.NotFound,
string.Format(ExceptionStrings.ResourceNotFound, request.RequestUri),
string.Format(ExceptionStrings.ControllerNameNotFound, request.RequestUri)));
}
HttpControllerDescriptor controllerDescriptor;
if (this._controllerInfoCache.Value.TryGetValue(controllerName, out controllerDescriptor))
{
return(controllerDescriptor);
}
ICollection <Type> matchingTypes = this._controllerTypeCache.GetControllerTypes(controllerName);
// ControllerInfoCache is already initialized.
Contract.Assert(matchingTypes.Count != 1);
if (matchingTypes.Count == 0)
{
// no matching types
Throw.HttpResponse(request.CreateErrorResponse(HttpStatusCode.NotFound,
string.Format(ExceptionStrings.ResourceNotFound, request.RequestUri),
string.Format(ExceptionStrings.DefaultControllerFactory_ControllerNameNotFound,
controllerName.Name)));
}
else
{
// multiple matching types
Throw.Generic(CreateAmbiguousControllerException(request.GetRouteData().Route, controllerName.Name, matchingTypes));
}
// Throw.HttpResponse does not return a value so we have to return null here
return(null);
}
/// <summary>
/// Gets all controller types within the system matching the specified controller identification.
/// </summary>
/// <param name="controllerName">Name of the controller.</param>
/// <returns>
/// Returns an <see cref="T:System.Collections.Generic.ICollection`1" /> of controller types.
/// </returns>
/// <exception cref="T:System.ArgumentNullException">
/// controllername
/// or
/// <see cref="P:Geocrest.Web.Mvc.Controllers.ControllerIdentification.Name"/> is null or empty
/// </exception>
public ICollection <Type> GetControllerTypes(ControllerIdentification controllerName)
{
Throw.IfArgumentNull(controllerName, "controllerName");
Throw.IfArgumentNullOrEmpty(controllerName.Name, "controllerName");
var matchingTypes = new HashSet <Type>();
ILookup <string, Type> namespaceLookup;
if (this._cache.Value.TryGetValue(controllerName, out namespaceLookup))
{
foreach (var namespaceGroup in namespaceLookup)
{
matchingTypes.UnionWith(namespaceGroup);
}
}
return(matchingTypes);
}
private ConcurrentDictionary <ControllerIdentification, HttpControllerDescriptor> InitializeControllerInfoCache()
{
// lock dependend properties
_VersionPrefix.Lock();
// let's find and cache the found controllers
var result = new ConcurrentDictionary <ControllerIdentification, HttpControllerDescriptor>(ControllerIdentification.Comparer);
var duplicateControllers = new HashSet <ControllerIdentification>();
Dictionary <ControllerIdentification, ILookup <string, Type> > controllerTypeGroups = this._controllerTypeCache.Cache;
foreach (KeyValuePair <ControllerIdentification, ILookup <string, Type> > controllerTypeGroup in controllerTypeGroups)
{
ControllerIdentification controllerName = controllerTypeGroup.Key;
foreach (IGrouping <string, Type> controllerTypesGroupedByNs in controllerTypeGroup.Value)
{
foreach (Type controllerType in controllerTypesGroupedByNs)
{
if (result.Keys.Contains(controllerName))
{
duplicateControllers.Add(controllerName);
break;
}
else
{
result.TryAdd(controllerName, new HttpControllerDescriptor(this._configuration,
controllerName.Name, controllerType));
}
}
}
}
foreach (ControllerIdentification duplicateController in duplicateControllers)
{
HttpControllerDescriptor descriptor;
result.TryRemove(duplicateController, out descriptor);
}
return(result);
}