public Task MapAsync(Func<IContainer> container, Type type, MethodInfo method, Routing.Route route)
        {
            container.ThrowIfNull("container");
            type.ThrowIfNull("type");
            method.ThrowIfNull("method");
            route.ThrowIfNull("route");

            bool methodReturnTypeImplementsIResponse = method.ReturnType.ImplementsInterface<IResponse>();
            bool methodReturnTypeIsTaskT = method.ReturnType.IsGenericType && method.ReturnType.GetGenericTypeDefinition() == typeof(Task<>);
            bool methodReturnTypeIsVoid = method.ReturnType == typeof(void);

            if (methodReturnTypeImplementsIResponse)
            {
                ParameterInfo[] parameterInfos = method.GetParameters();
                ParameterExpression instanceParameterExpression = Expression.Parameter(typeof(object), "instance");
                ParameterExpression parametersParameterExpression = Expression.Parameter(typeof(object[]), "parameters");
                UnaryExpression unaryExpression =
                    Expression.Convert(
                        Expression.Call(
                            Expression.Convert(instanceParameterExpression, type),
                            method,
                            parameterInfos.Select((arg, index) => Expression.Convert(
                                Expression.ArrayIndex(parametersParameterExpression, Expression.Constant(index)),
                                arg.ParameterType))),
                        typeof(IResponse));
                Func<object, object[], IResponse> @delegate = Expression.Lambda<Func<object, object[], IResponse>>(unaryExpression, instanceParameterExpression, parametersParameterExpression).Compile();

                route.RespondWith(
                    async context =>
                    {
                        object instance;

                        try
                        {
                            instance = container().GetInstance(type);
                        }
                        catch (Exception exception)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName), exception);
                        }
                        if (instance == null)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName));
                        }

                        var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
                        object[] parameterValues = (await parameterValueRetriever.GetParameterValuesAsync(context, type, method)).ToArray();
                        var mappedDelegateContexts = new List<IMappedDelegateContext>();

                        try
                        {
                            mappedDelegateContexts.AddRange(_contextFactories.Select(arg => arg.CreateContext(context, type, method)).Where(arg => arg != null));

                            IResponse response = @delegate(instance, parameterValues);

                            foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
                            {
                                mappedDelegateContext.Complete();
                            }

                            return response;
                        }
                        finally
                        {
                            foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
                            {
                                mappedDelegateContext.Dispose();
                            }
                        }
                    },
                    method.ReturnType);
            }
            else if (methodReturnTypeIsTaskT)
            {
                ParameterInfo[] parameterInfos = method.GetParameters();
                ParameterExpression instanceParameterExpression = Expression.Parameter(typeof(object), "instance");
                ParameterExpression parametersParameterExpression = Expression.Parameter(typeof(object[]), "parameters");
                Type methodGenericArgumentType = method.ReturnType.GetGenericArguments()[0];
                MethodInfo upcastMethodInfo = typeof(TaskExtensions)
                    .GetMethod("Upcast", BindingFlags.Static | BindingFlags.Public)
                    .MakeGenericMethod(methodGenericArgumentType, typeof(IResponse));
                UnaryExpression unaryExpression =
                    Expression.Convert(
                        Expression.Call(
                            upcastMethodInfo,
                            Expression.Call(
                                Expression.Convert(instanceParameterExpression, type),
                                method,
                                parameterInfos.Select((arg, index) => Expression.Convert(
                                    Expression.ArrayIndex(parametersParameterExpression, Expression.Constant(index)),
                                    arg.ParameterType)))),
                        upcastMethodInfo.ReturnType);
                Func<object, object[], Task<IResponse>> @delegate = Expression.Lambda<Func<object, object[], Task<IResponse>>>(unaryExpression, instanceParameterExpression, parametersParameterExpression).Compile();

                route.RespondWith(
                    async context =>
                    {
                        object instance;

                        try
                        {
                            instance = container().GetInstance(type);
                        }
                        catch (Exception exception)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName), exception);
                        }
                        if (instance == null)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName));
                        }

                        var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
                        object[] parameterValues = (await parameterValueRetriever.GetParameterValuesAsync(context, type, method)).ToArray();
                        var mappedDelegateContexts = new List<IMappedDelegateContext>();

                        try
                        {
                            mappedDelegateContexts.AddRange(_contextFactories.Select(arg => arg.CreateContext(context, type, method)).Where(arg => arg != null));

                            IResponse response = await @delegate(instance, parameterValues);

                            foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
                            {
                                mappedDelegateContext.Complete();
                            }

                            return response;
                        }
                        finally
                        {
                            foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
                            {
                                mappedDelegateContext.Dispose();
                            }
                        }
                    },
                    methodGenericArgumentType);
            }
            else if (methodReturnTypeIsVoid)
            {
                ParameterInfo[] parameterInfos = method.GetParameters();
                ParameterExpression instanceParameterExpression = Expression.Parameter(typeof(object), "instance");
                ParameterExpression parametersParameterExpression = Expression.Parameter(typeof(object[]), "parameters");
                MethodCallExpression methodCallExpression =
                    Expression.Call(
                        Expression.Convert(instanceParameterExpression, type),
                        method,
                        parameterInfos.Select((arg, index) => Expression.Convert(
                            Expression.ArrayIndex(parametersParameterExpression, Expression.Constant(index)),
                            arg.ParameterType)));
                Action<object, object[]> @delegate = Expression.Lambda<Action<object, object[]>>(methodCallExpression, instanceParameterExpression, parametersParameterExpression).Compile();

                route.RespondWithNoContent(
                    async context =>
                    {
                        object instance;

                        try
                        {
                            instance = container().GetInstance(type);
                        }
                        catch (Exception exception)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName), exception);
                        }
                        if (instance == null)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName));
                        }

                        var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
                        object[] parameterValues = (await parameterValueRetriever.GetParameterValuesAsync(context, type, method)).ToArray();
                        var mappedDelegateContexts = new List<IMappedDelegateContext>();

                        try
                        {
                            mappedDelegateContexts.AddRange(_contextFactories.Select(arg => arg.CreateContext(context, type, method)).Where(arg => arg != null));

                            @delegate(instance, parameterValues);

                            foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
                            {
                                mappedDelegateContext.Complete();
                            }
                        }
                        finally
                        {
                            foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
                            {
                                mappedDelegateContext.Dispose();
                            }
                        }
                    });
            }
            else
            {
                throw new ApplicationException(String.Format("The return type of {0}.{1} must implement {2} or be a {3} whose generic type argument implements {2}.", type.FullName, method.Name, typeof(IResponse).Name, typeof(Task<>)));
            }

            return Task.Factory.Empty();
        }
        public void Map(Func<IContainer> container, Type type, MethodInfo method, Routing.Route route)
        {
            container.ThrowIfNull("container");
            type.ThrowIfNull("type");
            method.ThrowIfNull("method");
            route.ThrowIfNull("route");

            if (method.ReturnType == typeof(void))
            {
                route.RespondWithNoContent();
                return;
            }
            if (!method.ReturnType.ImplementsInterface<IResponse>())
            {
                throw new ApplicationException(String.Format("The return type of '{0}.{1}' does not implement '{2}'.", type.FullName, method.Name, typeof(IResponse).Name));
            }

            route.RespondWith(
                request =>
                    {
                        object instance;

                        try
                        {
                            instance = container().GetInstance(type);
                        }
                        catch (Exception exception)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type '{0}'.", type.FullName), exception);
                        }
                        if (instance == null)
                        {
                            throw new ApplicationException(String.Format("Unable to resolve instance of type '{0}'.", type.FullName));
                        }

                        var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
                        IEnumerable<object> parameterValues = parameterValueRetriever.GetParameterValues(request, type, method);

                        return (IResponse)method.Invoke(instance, parameterValues.ToArray());
                    },
                method.ReturnType);
        }