请求/响应方案

时间:2018-01-08 11:11:47

标签: rabbitmq .net-core masstransit request-response

尝试使用MassTransit.RabbitMQ版本4.0.1.1378-develop,ASP.NET Core 2 Web应用程序和.NET Core 2控制台项目实现请求/响应方案。

以下是在我的ASP.NET Core 2.0应用程序中创建总线和请求客户端的代码:

var bus = Bus.Factory.CreateUsingRabbitMq(sbc =>
    sbc.Host(new Uri("rabbitmq://localhost"), h =>
    {
        h.Username("guest");
        h.Password("guest");
    })
);
services.AddSingleton<IPublishEndpoint>(bus);
services.AddSingleton<IBusControl>(bus);
var requestTimeout = TimeSpan.FromSeconds(10);
var address = new Uri("rabbitmq://localhost/myqueue");
services.AddScoped<IRequestClient<SubmitOrder, OrderSubmitResult>>(ctx => new MessageRequestClient<SubmitOrder, OrderSubmitResult>(bus, address, requestTimeout));

然后使用已注入我的控制器的IRequestClient<SubmitOrder, OrderSubmitResult>,我发送请求如下:

private readonly IRequestClient<SubmitOrder, OrderSubmitResult> _client;
public async Task<ActionResult> SendRequest(string id)
{
    var result = await _client.Request(new SubmitOrder());
    ...
}

最后,我尝试向客户发送响应的方式:

var bus = Bus.Factory.CreateUsingRabbitMq(cfg =>
{
    var host = cfg.Host(new Uri("rabbitmq://localhost"), h =>
    {
        h.Username("guest");
        h.Password("guest");
    });
    cfg.ReceiveEndpoint(host, "myqueue", ep =>
    {
        ep.Handler<SubmitOrder>(context => context.RespondAsync(new OrderSubmitResult()));

        // async version
        //ep.Handler<SubmitOrder>(async context =>
        //{
        //  await context.RespondAsync(new OrderSubmitResult());
        //});

        // with a Consumer
        //ep.Consumer<SubmitOrderConsumer>();

        // with a single Consumer
        //ep.Instance(new SubmitOrderConsumer());
    });
});
bus.Start();

我在公交车上收到请求,并发送适当的回复。但我总是在客户端获得RequestTimeoutException,并且上述方法都不起作用。

更新

代码没问题。我忘了在客户端启动总线(bus.start):/

@Chris:感谢您在短时间内添加完整的工作样本。我建议添加services.AddSingleton<IBusControl>(bus);,然后将Startup.cs的{​​{1}}方法更改为以下内容:

Configure

处理正常关机。

1 个答案:

答案 0 :(得分:3)

我已经构建了一个示例来说明如何正确执行此操作,包括使用ASP.NET Core 2,Web应用程序和控制台应用程序。

https://github.com/MassTransit/Sample-DotNetCore-Request

享受!