public IRegistration LookupType(Query targetType, ResolverContext context)
{
IRegistration registration = underlying.LookupType(targetType, context);
if (registration != null)
{
return registration;
}
Type type = targetType.ServiceType;
if (!type.IsInterface && !type.IsAbstract && targetType.Name == null)
{
lock (createdRegistrations)
{
if (createdRegistrations.ContainsKey(type))
return createdRegistrations[type];
var reg = new Registration
{
Service = targetType.ServiceType,
Implementor = targetType.ServiceType,
Lifestyle = lifestyle
};
createdRegistrations.Add(type, reg);
return reg;
}
}
return null;
}
public virtual object CreateType(Query query, ResolverContext context)
{
//Need to create a deep copy of the Context to make splitting the graph possible
var localContext = ResolverContext.CreateContextFromContext(context);
var registration = FindSuitableImplementor(query, localContext);
var retVal = registration.Lifestyle.Execute(() =>
{
var creationContext = GenerateCreationContext(registration, localContext);
return activator.CreateInstance(creationContext);
});
return retVal;
}
public virtual IRegistration LookupType(Query query, ResolverContext context)
{
IList<IRegistration> localParents = new List<IRegistration>(context.UsedRegistrations);
var registrations = componentStore.GetRegistrationsForService(query.ServiceType);
if (query.Name != null)
{
var @default = registrations.SingleOrDefault(p => p.Name == query.Name);
if (@default == null)
throw new ServiceNotFoundException(query.ServiceType, query.Name);
return @default;
}
var registration = SkipParents(registrations, localParents);
if (registration == null)
return null;
context.ConsumeRegistration(registration);
return registration;
}
public virtual CreationContext GenerateCreationContext(IRegistration registration, ResolverContext context)
{
var componentType = registration.Implementor;
var constructors = componentType.GetConstructors()
.OrderByDescending(p => p.GetParameters().Count());
IList<DependencyMissingException> missingDependencies = new List<DependencyMissingException>();
foreach (var info in constructors)
{
missingDependencies = new List<DependencyMissingException>();
var parameters = info.GetParameters();
if (parameters.Length == 0) //Fast way out.
return CreateReturnContext(componentType, null);
IList<object> resolvedParameters = new List<object>();
foreach (var parameter in parameters)
{
string explicitDependencyName = null;
var parameterName = parameter.Name;
if (registration.Parameters.ContainsKey(parameterName))
explicitDependencyName = registration.Parameters[parameterName];
Type type = parameter.ParameterType;
try
{
var query = new Query {ServiceType = type, Name = explicitDependencyName};
resolvedParameters.Add(CreateType(query, context));
}
catch (ServiceNotFoundException exception)
{
missingDependencies.Add(new DependencyMissingException(exception.Message, registration.Service.Name));
}
}
if (resolvedParameters.Count == parameters.Length)
return CreateReturnContext(componentType, resolvedParameters.ToArray());
}
throw missingDependencies.First(); //TODO: Expose all missing dependencies
}
public virtual object CreateType(Query query)
{
return CreateType(query, new ResolverContext());
}
private IRegistration FindSuitableImplementor(Query query, ResolverContext context)
{
var suitableImplementor = componentLookup.LookupType(query, context);
if (suitableImplementor == null)
throw new ServiceNotFoundException(query.ServiceType);
return suitableImplementor;
}
