/// <summary>
/// Resolves the last registered service with a matching name.
/// </summary>
/// <typeparam name="TInterface"></typeparam>
/// <param name="name"></param>
/// <returns></returns>
public TInterface Resolve <TInterface>(string name)
{
var interfaceType = typeof(TInterface);
var typeAndName = new TypeAndName(interfaceType, name);
Type type;
if (RegisteredTypes.TryGetValue(typeAndName, out type))
{
object lazyInstance;
if (StoredServices.TryGetValue(typeAndName, out lazyInstance) && lazyInstance.GetType() == typeof(Func <TInterface>))
{
// Lazy singletons must be invoked when called first time.
var invokedLazy = ((Func <TInterface>)lazyInstance).Invoke();
StoredServices.AddOrUpdate(typeAndName, k => invokedLazy, (k, v) => invokedLazy);
}
object instance;
if (StoredServices.TryGetValue(typeAndName, out instance))
{
// Return the stored singleton object.
return((TInterface)instance);
}
// Get the first constructor from the registered type.
var constructor = type.GetConstructors().First();
// Create a new instance and return it.
var activator = Common.Activator.GetActivator(constructor);
return((TInterface)activator());
}
return(default(TInterface));
}
private object InternalResolve(Type targetType)
{
if (targetType.IsClass)
{
ITypeDefinition typeDefinition;
if (RegisteredTypes.TryGetValue(targetType, out typeDefinition))
{
if (typeDefinition.SingletonInstance != null)
{
return(typeDefinition.SingletonInstance);
}
if (typeDefinition.ConstructorMethods == null || typeDefinition.ConstructorMethods.Length == 0)
{
throw new Exception(string.Format("constructor method cannot be found in type '{0}'", targetType.FullName));
}
var defaultConstructor = typeDefinition.ConstructorMethods[0];
var parameterValues = new object[defaultConstructor.ParameterInfos.Length];
for (int i = 0; i < parameterValues.Length; i++)
{
var parameterInfo = defaultConstructor.ParameterInfos.FirstOrDefault(x => x.Index == i);
if (parameterInfo == null)
{
throw new Exception(string.Format("parameter is missing in contructor method."));
}
parameterValues[i] = InternalResolve(parameterInfo.TypeDefinition.Info as Type);
}
return(typeDefinition.GetInstance(parameterValues));
}
return(null);
}
else if (targetType.IsInterface)
{
var typeDefinition = RegisteredTypes.Values.ToArray().Where(x => x.Inference != null && x.Inference.Equals(targetType))
.OrderByDescending(x => x.Priority).FirstOrDefault();
if (typeDefinition == null)
{
throw new Exception(string.Format("failed to find registered type inferred from interface '{0}'.", targetType.FullName));
}
if (typeDefinition.SingletonInstance != null)
{
return(typeDefinition.SingletonInstance);
}
return(InternalResolve(typeDefinition.Info as Type));
}
else
{
return(null);
}
}
protected string CheckRegisteredType() => RegisteredTypes.TryGetValue(Arguments[0], out var type) && ((DataType = type) == type) ? null : $"invalid type '{Arguments[0]}'";
