NServiceBus 结合 RabbitMQ 使用

参考官方教程：

Step by Step Guide

新建4个项目：

• A Console Application named Client
• A Console Application named Server
• A Console Application named Subscriber
• A Class Library named Shared

Framework框架选择4.6及以上，后面有用到。

Client,Server,Subscriber引用Shared。

4个项目都安装NServiceBus包：

Install-Package NServiceBus

3个控制台项目安装NServiceBus.RabbitMQ包：

Install-Package NServiceBus.RabbitMQ

Share代码：

using NServiceBus;

public class PlaceOrder:ICommand
    {
        public Guid Id { get; set; }
        public string Product { get; set; }
    }

public class OrderPlaced:IEvent
    {
        public Guid OrderId { get; set; }
    }

public class PlaceShipping:ICommand
    {
        public Guid Id { get; set; }
        public string Product { get; set; }
    }

Client代码：

namespace Client
{
    class Program
    {
        static void Main(string[] args)
        {
            AsyncMain().GetAwaiter().GetResult();
        }
        static async Task AsyncMain()
        {
            Console.Title = "Sample.StepByStep.Client";
            var endpointConfiguration = new EndpointConfiguration(endpointName: "Sample.StepByStep.Client");
            endpointConfiguration.SendFailedMessagesTo("error");
            var transport = endpointConfiguration.UseTransport<RabbitMQTransport>();
            transport.ConnectionString("host=10.255.20.44;username=guest;password=guest");
            endpointConfiguration.UseSerialization<JsonSerializer>();
            endpointConfiguration.EnableInstallers();
            endpointConfiguration.UsePersistence<InMemoryPersistence>();
            var endpointInstance = await Endpoint.Start(endpointConfiguration).ConfigureAwait(false);
            try
            {
                await SendOrder(endpointInstance);
            }
            catch (Exception)
            {
                await endpointInstance.Stop().ConfigureAwait(false);
            }
        }

        private static async Task SendOrder(IEndpointInstance endpointInstance)
        {
            Console.WriteLine("Press enter to send a message");
            Console.WriteLine("Press any key to exit");
            while(true)
            {
                var key = Console.ReadKey();
                Console.WriteLine();
                if(key.Key!=ConsoleKey.Enter)
                {
                    return;
                }
                var id = Guid.NewGuid();
                var id2 = Guid.NewGuid();
                var placeOrder = new PlaceOrder
                {
                    Product = "New shoes",
                    Id = id
                };
                var placeShipping = new PlaceShipping
                {
                    Product = "A-->B",
                    Id = id2
                };
                await endpointInstance.Send("Samples.StepByStep.Server", placeOrder);
                await endpointInstance.Send("Samples.StepByStep.Server", placeShipping);
                Console.WriteLine($"Sent a PlaceOrder messge with id:{id:N}");
                Console.WriteLine($"Sent a PlaceShipping messge with id:{id2:N}");
            }
        }
    }
}

Server代码：

namespace Server
{
    class Program
    {
        static void Main(string[] args)
        {
            AsyncMain().GetAwaiter().GetResult();
        }
        static async Task AsyncMain()
        {
            Console.Title = "Samples.StepByStep.Server";
            var endpointConfiguration = new EndpointConfiguration("Samples.StepByStep.Server");
            endpointConfiguration.UseSerialization<JsonSerializer>();
            endpointConfiguration.EnableInstallers();
            var transport = endpointConfiguration.UseTransport<RabbitMQTransport>();
            transport.ConnectionString("host=10.255.20.44;username=guest;password=guest");
            endpointConfiguration.UsePersistence<InMemoryPersistence>();
            endpointConfiguration.SendFailedMessagesTo("error");

            var endpointInstance = await Endpoint.Start(endpointConfiguration)
                .ConfigureAwait(false);
            try
            {
                Console.WriteLine("Press any key to exit");
                Console.ReadKey();
            }
            finally
            {
                await endpointInstance.Stop()
                    .ConfigureAwait(false);
            }
        }
    }
}

namespace Server
{
    public class PlaceOrderHandler : IHandleMessages<PlaceOrder>
    {
        static ILog log = LogManager.GetLogger<PlaceOrderHandler>();

        public Task Handle(PlaceOrder message, IMessageHandlerContext context)
        {
            log.Info($"Order for Product:{message.Product} placed with id: {message.Id}");
            log.Info($"Publishing: OrderPlaced for Order Id: {message.Id}");

            var orderPlaced = new OrderPlaced
            {
                OrderId = message.Id
            };
            return context.Publish(orderPlaced);
        }
    }
}

namespace Server
{
    public class PlaceShippingHandler : IHandleMessages<PlaceShipping>
    {
        static ILog log = LogManager.GetLogger<PlaceShippingHandler>();

        public Task Handle(PlaceShipping message, IMessageHandlerContext context)
        {
            log.Info($"Shipping for Product:{message.Product} placed with id: {message.Id}");
            return Task.CompletedTask;
        }
    }
}

为什么要选4.6以上，原因就在Task.CompletedTask需要4.6以上。

SubScribe代码：

namespace Subscriber
{
    class Program
    {
        static void Main(string[] args)
        {
            AsyncMain().GetAwaiter().GetResult();
        }
        static async Task AsyncMain()
        {
            Console.Title = "Samples.StepByStep.Subscriber";
            var endpointConfiguration = new EndpointConfiguration("Samples.StepByStep.Subscriber");
            endpointConfiguration.UseSerialization<JsonSerializer>();
            endpointConfiguration.EnableInstallers();
            var transport = endpointConfiguration.UseTransport<RabbitMQTransport>();
            transport.ConnectionString("host=10.255.20.44;username=guest;password=guest");
            endpointConfiguration.UsePersistence<InMemoryPersistence>();
            endpointConfiguration.SendFailedMessagesTo("error");

            var endpointInstance = await Endpoint.Start(endpointConfiguration)
                .ConfigureAwait(false);
            try
            {
                Console.WriteLine("Press any key to exit");
                Console.ReadKey();
            }
            finally
            {
                await endpointInstance.Stop()
                    .ConfigureAwait(false);
            }
        }
    }
}

namespace Subscriber
{
    public class OrderCreatedHandler : IHandleMessages<OrderPlaced>
    {
        static ILog log = LogManager.GetLogger<OrderCreatedHandler>();

        public Task Handle(OrderPlaced message, IMessageHandlerContext context)
        {
            log.Info($"Handling: OrderPlaced for Order Id: {message.OrderId}");
            return Task.CompletedTask;
        }
    }
}

选择多启动项目：

启动项目，在Client端按回车，可以看到Server端和Subscribe端的接收信息：

同时查看http://10.255.20.44:15672/#/queues：