RabbitMQ consumer in ASP.NET Core application whith out the web request

Question

Summary i do how it resolved in Setup RabbitMQ consumer in ASP.NET Core application but my Rabbit consumer online if i do web request, if i start IIS and don't start browser request, Rabbit consumer is not started. Have any one know why? Can a web application do the work of a web application and a Windows service or is it a bad idea.

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        ...
        services.AddSingleton<RabbitListener>();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        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()
    {
        foreach (var o in LogOptions.Options)
            _listener.NewRouteAdd(o.QueueString);
        _listener.Register();
    }

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

Services are only started once they are actually used. So on starting up the application on IIS you need to explicitly make a call to a method/route that uses the service. At least that's how we solved this issue before. — Markus Deibel
– Markus Deibel, Commented May 8, 2019 at 9:20
Maby it can be call in "static main",before create service or any one net mvc object can do it? — xSx
– xSx, Commented May 8, 2019 at 10:23

Roberto · Accepted Answer · 2019-05-08 22:00:27Z

0

The OnStart() runs once, when your application receives the first HTTP request I think the best option for you is to create a Windows Service for consuming messages or any application that keeps alive connection

I suggest for you these links: https://www.cloudamqp.com/blog/2018-01-19-part4-rabbitmq-13-common-errors.html https://www.cloudamqp.com/blog/2017-12-29-part1-rabbitmq-best-practice.html

answered May 8, 2019 at 22:00

Roberto

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