public IFunctionInvoker Create(MethodInfo method)
{
if (method == null)
{
throw new ArgumentNullException(nameof(method));
}
Type?reflectedType = method.ReflectedType;
if (reflectedType == null)
{
throw new InvalidOperationException("No reflected type was found.");
}
MethodInfo genericMethodDefinition = typeof(DefaultFunctionInvokerFactory).GetMethod(nameof(DefaultFunctionInvokerFactory.CreateGeneric), BindingFlags.NonPublic | BindingFlags.Static) !;
if (!TryGetReturnType(method, out Type? returnType))
{
returnType = typeof(object);
}
MethodInfo genericMethod = genericMethodDefinition.MakeGenericMethod(reflectedType, returnType !);
IFunctionActivator activator = _functionActivator;
if (method.IsStatic)
{
activator = NullFunctionActivator.Instance;
}
var lambda = (Func <MethodInfo, IMethodInvokerFactory, IFunctionActivator, IFunctionInvoker>)Delegate.CreateDelegate(typeof(Func <MethodInfo, IMethodInvokerFactory, IFunctionActivator, IFunctionInvoker>), genericMethod);
return(lambda.Invoke(method, _methodInvokerFactory, activator));
}
public IFunctionInvoker Create(FunctionDefinition definition)
{
var method = _methodLocator.GetMethod(definition.PathToAssembly, definition.EntryPoint);
Type?reflectedType = method.ReflectedType;
if (reflectedType == null)
{
throw new InvalidOperationException($"No reflected type '{method.ReflectedType?.Name}' was found.");
}
MethodInfo genericMethodDefinition = typeof(DefaultFunctionInvokerFactory).GetMethod(nameof(DefaultFunctionInvokerFactory.CreateGeneric), BindingFlags.NonPublic | BindingFlags.Static) !;
if (!TryGetReturnType(method, out Type? returnType))
{
returnType = typeof(object);
}
MethodInfo genericMethod = genericMethodDefinition.MakeGenericMethod(reflectedType, returnType !);
IFunctionActivator activator = _functionActivator;
if (method.IsStatic)
{
activator = NullFunctionActivator.Instance;
}
var lambda = (Func <MethodInfo, IMethodInvokerFactory, IFunctionActivator, IFunctionInvoker>)Delegate.CreateDelegate(typeof(Func <MethodInfo, IMethodInvokerFactory, IFunctionActivator, IFunctionInvoker>), genericMethod);
return(lambda.Invoke(method, _methodInvokerFactory, activator));
}
/// <summary>
/// Creates an instance of the specified generic type argument, <typeparamref name="T"/>, to be used as the target of the invocation.
/// </summary>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="activator">The <see cref="IFunctionActivator"/> instance to use when creating the instance.</param>
/// <param name="context">The <see cref="FunctionContext"/> for the invocation triggering the instance creation.</param>
/// <returns>The created instance.</returns>
public static T?CreateInstance <T>(this IFunctionActivator activator, FunctionContext context)
where T : class
{
if (activator is null)
{
throw new ArgumentNullException(nameof(activator));
}
return(activator.CreateInstance(typeof(T), context) as T);
}
public void Create_ReturnsNull()
{
// Arrange
IFunctionActivator product = NullFunctionActivator.Instance;
// Act
object instance = product.CreateInstance(typeof(object), new TestFunctionContext());
// Assert
Assert.Null(instance);
}
public void Create_ReturnsNull()
{
// Arrange
IFunctionActivator product = NullFunctionActivator.Instance;
// Act
object instance = product.CreateInstance <object>(new ServiceCollection().BuildServiceProvider());
// Assert
Assert.Null(instance);
}
public void Create_IfMethodIsNull_Throws()
{
// Arrange
MethodInfo method = null;
IMethodInvokerFactory methodInvokerFactory = CreateMethodInvokerFactory();
IFunctionActivator activator = CreateDummyActivator();
IFunctionInvokerFactory _invokerFactory = new DefaultFunctionInvokerFactory(methodInvokerFactory, activator);
// Act & Assert
var ex = Assert.Throws <ArgumentNullException>(() => _invokerFactory.Create(method));
Assert.Equal("method", ex.ParamName);
}
public void Create_ReturnsFunctionInvoker()
{
// Arrange
MethodInfo method = GetMethodInfo(nameof(DefaultFunctionInvokerFactoryTests.StaticReturnVoid));
IMethodInvokerFactory methodInvokerFactory = CreateMethodInvokerFactory();
IFunctionActivator activator = CreateDummyActivator();
IFunctionInvokerFactory _invokerFactory = new DefaultFunctionInvokerFactory(methodInvokerFactory, activator);
// Act
IFunctionInvoker invoker = _invokerFactory.Create(method);
// Assert
Assert.IsType <DefaultFunctionInvoker <DefaultFunctionInvokerFactoryTests, object> >(invoker);
}
public DefaultFunctionDefinitionFactory(IFunctionInvokerFactory functionInvokerFactory, IFunctionActivator functionActivator)
{
_functionInvokerFactory = functionInvokerFactory ?? throw new ArgumentNullException(nameof(functionInvokerFactory));
_functionActivator = functionActivator ?? throw new ArgumentNullException(nameof(functionActivator));
}
private static IFunctionInvoker CreateGeneric <TReflected, TReturnValue>(MethodInfo method, IMethodInvokerFactory methodInvokerFactory, IFunctionActivator functionActivator)
{
List <string?> parameterNames = method.GetParameters().Select(p => p.Name).ToList();
IMethodInvoker <TReflected, TReturnValue> methodInvoker = methodInvokerFactory.Create <TReflected, TReturnValue>(method);
return(new DefaultFunctionInvoker <TReflected, TReturnValue>(methodInvoker, functionActivator));
}
public DefaultFunctionInvokerFactory(IMethodInvokerFactory methodInvokerFactory, IFunctionActivator functionActivator, IMethodInfoLocator methodLocator)
{
_methodInvokerFactory = methodInvokerFactory ?? throw new ArgumentNullException(nameof(methodInvokerFactory));
_functionActivator = functionActivator ?? throw new ArgumentNullException(nameof(functionActivator));
_methodLocator = methodLocator ?? throw new ArgumentNullException(nameof(methodLocator));
}
public DefaultFunctionInvoker(IMethodInvoker <TInstance, TReturn> methodInvoker, IFunctionActivator functionActivator)
{
_methodInvoker = methodInvoker ?? throw new ArgumentNullException(nameof(methodInvoker));
FunctionActivator = functionActivator ?? throw new ArgumentNullException(nameof(functionActivator));
}
