/// <summary>
/// Creates a new interceptable dynamic proxy.
/// </summary>
/// <param name="type">The type to intercept.</param>
/// <param name="interceptors">The <see cref="InterceptorDecoration" /> representing the type members decorated with interceptors.</param>
/// <param name="serviceProvider">The <see cref="IServiceProvider" /> helping the creating object.</param>
/// <returns>
/// The interceptable dynamic proxy.
/// </returns>
public object Create(Type type, InterceptorDecoration interceptors, IServiceProvider serviceProvider)
{
Guard.ArgumentNotNull(type, nameof(type));
Guard.ArgumentNotNull(interceptors, nameof(interceptors));
Guard.ArgumentNotNull(serviceProvider, nameof(serviceProvider));
if (this.CanIntercept(type) && !interceptors.IsEmpty)
{
var factory = DynamicProxyFactoryCache.Instance.GetTypeFactory(type, interceptors);
return(factory(interceptors, serviceProvider));
}
return(serviceProvider.GetService(type));
}
/// <summary>
/// Creates a new interceptable dynamic proxy to wrap the specficied target instance.
/// </summary>
/// <param name="type">The interface type to intercept.</param>
/// <param name="target">The target instance wrapped by the proxy.</param>
/// <param name="interceptors">The <see cref="InterceptorDecoration" /> representing the type members decorated with interceptors.</param>
/// <returns>
/// The generated interceptable dynamic proxy.
/// </returns>
/// <exception cref="ArgumentNullException"> <paramref name="type"/> is null.</exception>
/// <exception cref="ArgumentNullException"> <paramref name="target"/> is null.</exception>
/// <exception cref="ArgumentNullException"> <paramref name="interceptors"/> is null.</exception>
public object Wrap(Type type, object target, InterceptorDecoration interceptors)
{
Guard.ArgumentNotNull(type, nameof(type));
Guard.ArgumentNotNull(target, nameof(target));
Guard.ArgumentNotNull(interceptors, nameof(interceptors));
if (CanIntercept(type))
{
var factory = _dynamicProxyFactoryCache.GetInstanceFactory(type, interceptors);
return(factory(target, interceptors));
}
return(target);
}
/// <summary>
/// Initializes a new instance of the <see cref="DynamicProxyClassGenerator"/> class.
/// </summary>
/// <param name="typeToIntercept">The type to intercept.</param>
/// <param name="interceptors">The <see cref="InterceptorDecoration"/> representing the type members decorated with interceptors.</param>
/// <exception cref="ArgumentNullException">Specified <paramref name="typeToIntercept"/> is null.</exception>
/// <exception cref="ArgumentNullException">Specified <paramref name="interceptors"/> is null.</exception>
private DynamicProxyClassGenerator(Type typeToIntercept, InterceptorDecoration interceptors)
{
TypeToIntercept = Guard.ArgumentNotNull(typeToIntercept, nameof(typeToIntercept));
Interceptors = Guard.ArgumentNotNull(interceptors, nameof(interceptors));
var assemblyName = new AssemblyName($"AssemblyFor{typeToIntercept.Name}{GenerateSurfix()}");
var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
ModuleBuilder = assemblyBuilder.DefineDynamicModule($"{assemblyName}.dll");
if (TypeToIntercept.IsInterface)
{
TypeBuilder = ModuleBuilder.DefineType($"{typeToIntercept.Name}{GenerateSurfix()}", TypeAttributes.Public, typeof(object), new Type[] { typeToIntercept });
TargetField = TypeBuilder.DefineField("_target", typeToIntercept, FieldAttributes.Private);
}
else
{
TypeBuilder = ModuleBuilder.DefineType($"{typeToIntercept.Name}{GenerateSurfix()}", TypeAttributes.Public, typeToIntercept, new Type[] { typeof(IInterceptorsInitializer) });
}
InterceptorsField = TypeBuilder.DefineField("_interceptors", typeof(InterceptorDecoration), FieldAttributes.Private);
}
/// <summary>
/// Creates a <see cref="DynamicProxyClassGenerator"/> to generate dynamic proxy class based on interface based interception.
/// </summary>
/// <param name="type">The interface type to intercept.</param>
/// <param name="interceptors">The <see cref="InterceptorDecoration"/> representing the type members decorated with interceptors.</param>
/// <returns>The created <see cref="DynamicProxyClassGenerator"/>.</returns>
/// <exception cref="ArgumentNullException">Specified <paramref name="type"/> is null.</exception>
/// <exception cref="ArgumentException">Specified <paramref name="type"/> is a sealed type.</exception>
/// <exception cref="ArgumentNullException">Specified <paramref name="interceptors"/> is null.</exception>
public static DynamicProxyClassGenerator CreateVirtualMethodGenerator(Type type, InterceptorDecoration interceptors)
{
Guard.ArgumentNotNull(type, nameof(type));
if (type.IsSealed)
{
throw new ArgumentException(Resources.ExceptionSealedTypeNotAllowed, nameof(type));
}
return(new DynamicProxyClassGenerator(type, interceptors));
}
/// <summary>
/// Creates a <see cref="DynamicProxyClassGenerator"/> to generate dynamic proxy class based on interface based interception.
/// </summary>
/// <param name="interface">The interface type to intercept.</param>
/// <param name="interceptors">The <see cref="InterceptorDecoration"/> representing the type members decorated with interceptors.</param>
/// <returns>The created <see cref="DynamicProxyClassGenerator"/>.</returns>
/// <exception cref="ArgumentNullException">Specified <paramref name="interface"/> is null.</exception>
/// <exception cref="ArgumentException">Specified <paramref name="interface"/> is not an interface type.</exception>
/// <exception cref="ArgumentNullException">Specified <paramref name="interceptors"/> is null.</exception>
public static DynamicProxyClassGenerator CreateInterfaceGenerator(Type @interface, InterceptorDecoration interceptors)
{
Guard.ArgumentNotNull(@interface, nameof(@interface));
if ([email protected])
{
throw new ArgumentException(Resources.ExceptionArgumentNotInterface, nameof(@interface));
}
return(new DynamicProxyClassGenerator(@interface, interceptors));
}
public Func <InterceptorDecoration, IServiceProvider, object> GetTypeFactory(Type type, InterceptorDecoration interceptors)
{
if (_typeFactories.TryGetValue(type, out var factory))
{
return(factory);
}
lock (_typeFactories)
{
if (_typeFactories.TryGetValue(type, out factory))
{
return(factory);
}
var proxyType = DynamicProxyClassGenerator.CreateVirtualMethodGenerator(type, interceptors).GenerateProxyType();
return(_typeFactories[type] = CreateTypeFactory(proxyType));
}
}
public Func <object, InterceptorDecoration, object> GetInstanceFactory(Type type, InterceptorDecoration interceptors)
{
if (_instanceFactories.TryGetValue(type, out var factory))
{
return(factory);
}
lock (_instanceFactories)
{
if (_instanceFactories.TryGetValue(type, out factory))
{
return(factory);
}
var proxyType = DynamicProxyClassGenerator.CreateInterfaceGenerator(type, interceptors).GenerateProxyType();
return(_instanceFactories[type] = CreateInstanceFactory(proxyType));
}
}
