在 ASP.NET Core 应用程序中设置 RabbitMQ 消费者

问题描述

我有一个 ASP.NET Core 应用程序，我想在其中使用 RabbitMQ 消息.

I have an ASP.NET Core application where I would like to consume RabbitMQ messages.

我已在命令行应用程序中成功设置发布者和消费者，但我不确定如何在 Web 应用程序中正确设置.

I have successfully set up the publishers and consumers in command line applications, but I'm not sure how to set it up properly in a web application.

我想在 Startup.cs 中初始化它，但是一旦启动完成它当然就死了.

I was thinking of initializing it in Startup.cs, but of course it dies once startup is complete.

如何从网络应用以正确的方式初始化消费者?

How to initialize the consumer in a the right way from a web app?

推荐答案

使用单例模式让消费者/侦听器在应用程序运行时保留它.使用 IApplicationLifetime 接口在应用程序启动/停止时启动/停止使用者.

Use the Singleton pattern for a consumer/listener to preserve it while the application is running. Use the IApplicationLifetime interface to start/stop the consumer on the application start/stop.

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<RabbitListener>();
    }


    public void Configure(IApplicationBuilder app)
    {
        app.UseRabbitListener();
    }
}

public static class ApplicationBuilderExtentions
{
    //the simplest way to store a single long-living object, just for example.
    private static RabbitListener _listener { get; set; }

    public static IApplicationBuilder UseRabbitListener(this IApplicationBuilder app)
    {
        _listener = app.ApplicationServices.GetService<RabbitListener>();

        var lifetime = app.ApplicationServices.GetService<IApplicationLifetime>();

        lifetime.ApplicationStarted.Register(OnStarted);

        //press Ctrl+C to reproduce if your app runs in Kestrel as a console app
        lifetime.ApplicationStopping.Register(OnStopping);

        return app;
    }

    private static void OnStarted()
    {
        _listener.Register();
    }

    private static void OnStopping()
    {
        _listener.Deregister();    
    }
}

• 您应该注意应用的托管位置.例如，IIS 可以回收并阻止您的代码运行.
• 这种模式可以扩展到一个听众池.

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