/// <summary>
/// Defines the nested type that will instantiate the actual singleton service instance.
/// </summary>
/// <param name="module">The module that will host the singleton type.</param>
/// <param name="singletonType">The singleton type.</param>
/// <param name="instanceField">The field that will hold the singleton instance.</param>
/// <param name="serviceMap">The service map that contains the list of dependencies in the application.</param>
/// <param name="implementation">The implementation that will instantiate the dependency.</param>
/// <param name="dependency">The dependency that will be instantiated by the singleton.</param>
/// <param name="targetMethod">The method that will be used to instantiate the actual service instance.</param>
private void DefineNestedType(ModuleDefinition module, TypeDefinition singletonType, FieldDefinition instanceField, IDictionary<IDependency, IImplementation> serviceMap, IImplementation implementation, IDependency dependency, MethodDefinition targetMethod)
{
var objectType = module.ImportType(typeof (object));
var nestedName = string.Format("Nested-{0}", dependency.GetHashCode());
const TypeAttributes nestedAttributes = TypeAttributes.NestedFamORAssem | TypeAttributes.Sealed | TypeAttributes.AutoClass | TypeAttributes.Class | TypeAttributes.AnsiClass;
var nestedType = module.DefineClass(nestedName, "Hiro.Containers.Internal", nestedAttributes, objectType);
singletonType.NestedTypes.Add(nestedType);
nestedType.Fields.Add(instanceField);
// Emit the static constructor body
var cctor = DefineNestedConstructors(module, nestedType);
EmitSingletonInstantiation(dependency, implementation, serviceMap, instanceField, cctor, module, targetMethod);
}
/// <summary>
/// Adds a default constructor to the singleton type.
/// </summary>
/// <param name="module">The module that will host the singleton type.</param>
/// <param name="singletonName">The name of the singleton.</param>
/// <param name="typeAttributes">The type attributes that describes the singleton type.</param>
/// <param name="objectType">The object ty pe.</param>
/// <returns>A <see cref="TypeDefinition"/> that represents the singleton type.</returns>
private static TypeDefinition AddDefaultSingletonConstructor(ModuleDefinition module, string singletonName, TypeAttributes typeAttributes, TypeReference objectType)
{
// Add a default constructor and make it private
var singletonType = module.DefineClass(singletonName, "Hiro.Containers.Internal", typeAttributes, objectType);
singletonType.AddDefaultConstructor();
var constructor = singletonType.GetDefaultConstructor();
constructor.IsFamilyOrAssembly = true;
return singletonType;
}