internal IServiceCallSite GetServiceCallSite(Type serviceType, ISet <Type> callSiteChain)
{
try
{
if (callSiteChain.Contains(serviceType))
{
throw new InvalidOperationException(Resources.FormatCircularDependencyException(serviceType));
}
callSiteChain.Add(serviceType);
ServiceEntry entry;
if (_table.TryGetEntry(serviceType, out entry))
{
return(GetResolveCallSite(entry.Last, callSiteChain));
}
object emptyIEnumerableOrNull = GetEmptyIEnumerableOrNull(serviceType);
if (emptyIEnumerableOrNull != null)
{
return(new EmptyIEnumerableCallSite(serviceType, emptyIEnumerableOrNull));
}
return(null);
}
finally
{
callSiteChain.Remove(serviceType);
}
}
/// <summary>
/// Gets the service object of the specified type.
/// </summary>
/// <param name="serviceType"></param>
/// <returns></returns>
public object GetService(Type serviceType)
{
ServiceEntry entry;
if (_table.TryGetEntry(serviceType, out entry))
{
return(ResolveService(entry.Last));
}
object service = GetFallbackService(serviceType) ??
GetEmptyIEnumerableOrNull(serviceType);
if (service == null)
{
throw new Exception(
string.Format("TODO: No service for type '{0}' has been registered.", serviceType));
}
return(service);
}