MassTransit：在使用者中創建回調隊列

Question

MassTransit的新手，仍在使用一些教程項目。 我將要運行大約20分鍾的服務，完成后我需要做一些事情。 因為可能要花很長時間，所以我不想遵循請求/響應模式並等待響應，而又不想拖延線程。 我認為我的另一個選擇是創建另一個隊列，供消費者在工作完成時發布到該隊列。 我看了這篇文章： MassTransit3如何從消費者發出請求 ，但是我不確定如何實現這一點。 同樣來自本教程的我的項目如下所示：

出版商：

static void Main(string[] args)
{
    var bus = Bus.Factory.CreateUsingRabbitMq(x =>
        x.Host(new Uri("rabbitmq://localhost/"), h => {}));
    var busHandle = bus.Start();
    var text = ""'
    Console.WriteLine("Publisher");
    while(text != "quit")
    {
        Console.Write("Enter a message: ");
        text = Console.ReadLine();

        var message = new SomethingHappenedMessage()
        {
            What = text,
            When = DateTime.Now
        }
        bus.Publish(message);
    }
    busHandle.Stop();
}

訂戶：

static void Main(string[] args)
{
    var bus = Bus.Factory.CreateUsingRabbitMq(x => 
    {
        var host = x.Host(new Uri("rabbitmq://localhost"), h => {});
        x.ReceiveEndpoint(host, "MtPubSubExample_TestSubscriber", e =>
            e.Consumer<SomethingHappenedConsumer>());
    });
    Console.WriteLine("Subscriber");
    var busHandle = bus.Start();
    Console.ReadKey();
    busHandle.Stop();
}

消費者：

class SomethingHappenedConsumer : IConsumer<ISomethingHappened>
{
    public Task Consume(ConsumeContext<ISomethingHappened> context)
    {
        Console.Write("TXT: " + context.Message.What);
        Console.Write("  SENT: " + context.Message.When);
        Console.Write("  PROCESSED: " + DateTime.Now);
        Console.WriteLine(" (" + System.Threading.Thread.CurrentThread.ManagedThreadId + ")");
        return Task.FromResult(0);
    }
}

我將如何在使用者中創建回調隊列？

Answer 1

在您的使用者中，只需Bus.Publish(new ResponseMessage()); （或您所說的回應），並要求發布者為該消息類型注冊使用者。 您的發布者似乎沒有綁定到隊列，只是組成隊列名稱並將其也綁定到隊列。

Answer 2

再次感謝@Travis的幫助。 只是想展示我最終為將來的任何人使用的最終代碼。 該消息看起來很有趣，但是它已正確地發回到了發布者。

出版商：

static void Main(string[] args)
{
    var bus = Bus.Factory.CreateUsingRabbitMq(x =>
    {
        var host = x.Host(new Uri("rabbitmq://localhost/"), h => { });
        x.ReceiveEndpoint(host, "MtPubSubExample_TestPublisher", e =>
            e.Consumer<ResponseConsumer>());
    });
    var busHandle = bus.Start();
    var text = "";
    Console.WriteLine("Publisher");
    while(text != "quit")
    {
        Console.Write("Enter a message: ");
        text = Console.ReadLine();

        var message = new SomethingHappenedMessage()
        {
            What = text,
            When = DateTime.Now
        };
        bus.Publish(message);
    }

    busHandle.Stop();
}

響應消費者：

class ResponseConsumer : IConsumer<IResponse>
{
    public Task Consume(ConsumeContext<IResponse> context)
    {
        Console.WriteLine("RESPONSE MESSAGE: " + context.Message.Message);
        return Task.FromResult(0);
    }
}

訂戶：

static void Main(string[] args)
{
    var bus = Bus.Factory.CreateUsingRabbitMq(x =>
    {
        var host = x.Host(new Uri("rabbitmq://localhost/"), h => { });
        x.ReceiveEndpoint(host, "MtPubSubExample_TestSubscriber", e =>
            e.Consumer<SomethingHappenedConsumer>());
    });
    Console.WriteLine("Subscriber");
    var busHandle = bus.Start();
    Console.ReadKey();
    busHandle.Stop();
}

訂戶消費者：

class SomethingHappenedConsumer : IConsumer<ISomethingHappened>
{
    private IBusControl bus = Bus.Factory.CreateUsingRabbitMq(x =>
        x.Host(new Uri("rabbitmq://localhost/"), h => { }));

    public Task Consume(ConsumeContext<ISomethingHappened> context)
    {
        var now = DateTime.Now;
        Console.Write("TXT: " + context.Message.What);
        Console.Write("  SENT: " + context.Message.When);
        Console.Write("  PROCESSED: " + now);
        Console.WriteLine(" (" + System.Threading.Thread.CurrentThread.ManagedThreadId + ")");

        var response = new ResponseMessage()
        {
            Message = "The request was processed at " + now
        };

        bus.Publish(response);
        return Task.FromResult(0);
    }
}