private static Type GetInterceptableProxyType(
ICodeGeneratorFactory codeGeneratorFactory,
IInterceptorResolver interceptorResolver,
Type serviceType,
Type implementationType)
{
var interceptors = serviceType.IsInterface
? interceptorResolver.GetInterceptors(serviceType, implementationType)
: interceptorResolver.GetInterceptors(implementationType);
var codeGenerator = codeGeneratorFactory.Create();
var context = new CodeGenerationContext(serviceType, implementationType, interceptors);
var proxyType = codeGenerator.GenerateInterceptableProxyClass(context);
return(proxyType);
}
/// <summary>
/// Generates interceptable proxy class.
/// </summary>
/// <param name="context">The <see cref="CodeGenerationContext"/> representing code generation based execution context.</param>
/// <returns>The generated interceptable proxy class</returns>
public Type GenerateInterceptableProxyClass(CodeGenerationContext context)
{
_interfaceOrBaseType = context.InterfaceOrBaseType;
_targetType = context.TargetType;
_interceptors = context.Interceptors;
var assemblyName = new AssemblyName($"AssemblyFor{_interfaceOrBaseType.Name}{GenerateSurfix()}");
var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
_moduleBuilder = assemblyBuilder.DefineDynamicModule($"{assemblyName}.dll");
if (_interfaceOrBaseType.IsInterface)
{
_typeBuilder = _moduleBuilder.DefineType($"{_interfaceOrBaseType.Name}{GenerateSurfix()}", TypeAttributes.Public, typeof(object), new Type[] { _interfaceOrBaseType });
_targetField = _typeBuilder.DefineField("_target", _interfaceOrBaseType, FieldAttributes.Private);
}
else
{
_typeBuilder = _moduleBuilder.DefineType($"{_interfaceOrBaseType.Name}{GenerateSurfix()}", TypeAttributes.Public, _interfaceOrBaseType);
}
if (_interfaceOrBaseType.IsGenericType)
{
var interfaceParameters = ((TypeInfo)_interfaceOrBaseType).GenericTypeParameters;
var parameterNames = interfaceParameters.Select(it => it.Name).ToArray();
var proxyParameters = _typeBuilder.DefineGenericParameters(parameterNames);
for (int index = 0; index < interfaceParameters.Length; index++)
{
var parameter = proxyParameters[index];
parameter.SetGenericParameterAttributes(interfaceParameters[index].GenericParameterAttributes);
var constraints = new List <Type>();
foreach (Type constraint in interfaceParameters[index].GetGenericParameterConstraints())
{
if (constraint.IsClass)
{
parameter.SetBaseTypeConstraint(constraint);
}
else
{
constraints.Add(constraint);
}
}
if (constraints.Count > 0)
{
parameter.SetInterfaceConstraints(constraints.ToArray());
}
}
}
_interceptorsField = _typeBuilder.DefineField("_interceptors", typeof(IInterceptorRegistry), FieldAttributes.Private);
if (_interfaceOrBaseType.IsInterface)
{
GenerateForInterface();
}
else
{
GenerateForVirtualMethods();
}
return(_typeBuilder.CreateTypeInfo());
}
public ServiceDescriptorConverter(
ServiceDescriptor serviceDescriptor,
IInterceptorResolver interceptorResolver,
IInterceptableProxyFactoryCache factoryCache,
ICodeGeneratorFactory codeGeneratorFactory)
{
Guard.ArgumentNotNull(serviceDescriptor, nameof(serviceDescriptor));
Guard.ArgumentNotNull(interceptorResolver, nameof(interceptorResolver));
Guard.ArgumentNotNull(factoryCache, nameof(factoryCache));
if (serviceDescriptor.ImplementationInstance != null || serviceDescriptor.ImplementationFactory != null || serviceDescriptor.IsInterceptable())
{
_primaryDescriptor = serviceDescriptor;
return;
}
var serviceType = serviceDescriptor.ServiceType;
var implementationType = serviceDescriptor.ImplementationType;
var lifetime = serviceDescriptor.Lifetime;
if (serviceType.IsInterface)
{
var interceptors = interceptorResolver.GetInterceptors(serviceType, implementationType);
if (interceptors.IsEmpty)
{
_primaryDescriptor = new ServiceDescriptor(serviceType, implementationType, lifetime);
}
else if (serviceType.IsGenericTypeDefinition)
{
_secondaryDescriptor = new ServiceDescriptor(implementationType, implementationType, lifetime);
var codeGenerator = codeGeneratorFactory.Create();
var context = new CodeGenerationContext(serviceType, implementationType, interceptors);
var proxyType = codeGenerator.GenerateInterceptableProxyClass(context);
_primaryDescriptor = new ServiceDescriptor(serviceType, proxyType, lifetime);
}
else
{
_primaryDescriptor = new ServiceDescriptor(serviceType, CreateOrGet, lifetime);
object CreateOrGet(IServiceProvider serviceProvider)
{
var target = ActivatorUtilities.CreateInstance(serviceProvider, implementationType);
return(factoryCache.GetInstanceFactory(serviceType, implementationType).Invoke(target));
}
}
}
else
{
var interceptors = interceptorResolver.GetInterceptors(implementationType);
if (interceptors.IsEmpty)
{
_primaryDescriptor = new ServiceDescriptor(serviceType, implementationType, lifetime);
}
else
{
var codeGenerator = codeGeneratorFactory.Create();
var context = new CodeGenerationContext(implementationType, interceptors);
var proxyType = codeGenerator.GenerateInterceptableProxyClass(context);
_primaryDescriptor = new ServiceDescriptor(serviceType, proxyType, lifetime);
}
}
}
