private ServiceCallSite TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain, int slot)
{
if (serviceType == descriptor.ServiceType)
{
ServiceCallSite callSite;
var lifetime = new ResultCache(descriptor.Lifetime, serviceType, slot);
if (descriptor.ImplementationInstance != null)
{
callSite = new ConstantCallSite(descriptor.ServiceType, descriptor.ImplementationInstance);
}
else if (descriptor.ImplementationFactory != null)
{
callSite = new FactoryCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationFactory);
}
else if (descriptor.ImplementationType != null)
{
callSite = CreateConstructorCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationType, callSiteChain);
}
else
{
throw new InvalidOperationException("Invalid service descriptor");
}
return(callSite);
}
return(null);
}
private ServiceCallSite TryCreateEnumerable(Type serviceType, CallSiteChain callSiteChain)
{
try
{
callSiteChain.Add(serviceType);
if (serviceType.IsConstructedGenericType &&
serviceType.GetGenericTypeDefinition() == typeof(IEnumerable <>))
{
Type itemType = serviceType.GenericTypeArguments[0];
CallSiteResultCacheLocation cacheLocation = CallSiteResultCacheLocation.Root;
var callSites = new List <ServiceCallSite>();
// If item type is not generic we can safely use descriptor cache
if (!itemType.IsConstructedGenericType &&
_descriptorLookup.TryGetValue(itemType, out ServiceDescriptorCacheItem descriptors))
{
for (int i = 0; i < descriptors.Count; i++)
{
ServiceDescriptor descriptor = descriptors[i];
// Last service should get slot 0
int slot = descriptors.Count - i - 1;
// There may not be any open generics here
ServiceCallSite callSite = TryCreateExact(descriptor, itemType, callSiteChain, slot);
Debug.Assert(callSite != null);
cacheLocation = GetCommonCacheLocation(cacheLocation, callSite.Cache.Location);
callSites.Add(callSite);
}
}
else
{
int slot = 0;
// We are going in reverse so the last service in descriptor list gets slot 0
for (int i = _descriptors.Count - 1; i >= 0; i--)
{
ServiceDescriptor descriptor = _descriptors[i];
ServiceCallSite callSite = TryCreateExact(descriptor, itemType, callSiteChain, slot) ??
TryCreateOpenGeneric(descriptor, itemType, callSiteChain, slot, false);
if (callSite != null)
{
slot++;
cacheLocation = GetCommonCacheLocation(cacheLocation, callSite.Cache.Location);
callSites.Add(callSite);
}
}
callSites.Reverse();
}
ResultCache resultCache = ResultCache.None;
if (cacheLocation == CallSiteResultCacheLocation.Scope || cacheLocation == CallSiteResultCacheLocation.Root)
{
resultCache = new ResultCache(cacheLocation, new ServiceCacheKey(serviceType, DefaultSlot));
}
return(new IEnumerableCallSite(resultCache, itemType, callSites.ToArray()));
}
return(null);
}
finally
{
callSiteChain.Remove(serviceType);
}
}
