Hands-On RESTful Web Services with ASP.NET Core 3

Creating a sold-out handler

Let's start by creating a handler that manages the sold-out condition of a product in the cart service. First of all, we should proceed by adding the RabbitMQ.Client package to the Cart.Domain project by executing the following command:

dotnet add ./src/Cart.Domain package RabbitMQ.Client

We can continue by defining a class that represents the sold-out event that's used by the cart service in a new project that will contain all of the events. Therefore, we will proceed by creating a new ItemSoldOutEvent type, which represents a sold-out event:

using MediatR;namespace Cart.Domain.Events{    public class ItemSoldOutEvent : IRequest<Unit>    {        public string Id { get; set; }    }}

The ItemSoldOutEvent type contains a reference ...