/// <summary>
/// Use RabbitMQ.
/// Pass IApplicationLifetime.ApplicationStopping to this method.
/// </summary>
/// <param name="app"></param>
/// <returns></returns>
public static IApplicationBuilder UseRabbitMQWithAutoSubscribe(this IApplicationBuilder app,
CancellationToken applicationStopping)
{
_connection = _connection ?? app.ApplicationServices.GetRequiredService <IRabbitMQPersistentConnection>();
_connection.TryConnect();
_messageSubscriber = _messageSubscriber ?? app.ApplicationServices.GetRequiredService <IMessageSubscriber>();
_messageSubscriber.AutoSubscribe();
applicationStopping.Register(_connection.Dispose);
return(app);
}