public static class ServiceCollectionExtensions
  {
      /// <summary>
      /// Adds a set of Azure Relays and an associated Request Hanlder.
      /// </summary>
      /// <typeparam name="T">The type you wish to be injected as the Request Handler for incoming messages</typeparam>
      /// <param name="services">Service collection</param>
      /// <param name="relayConnectionStrings">Array of relay connection strings</param>
      /// <returns>Service Collection</returns>
      public static IServiceCollection AddAzureRelayListeners<T> (this IServiceCollection services, params string[] relayConnectionStrings)
          where T : class, IRequestHandler

      {
          services.AddSingleton<IRequestHandler, T>();

          foreach (var relayConnectionString in relayConnectionStrings)
          {
              services.AddSingleton<IAzureRelayListener>(x => new AzureRelayListener(
                  x.GetRequiredService<IRequestHandler>(),
                  relayConnectionString,
                  x.GetRequiredService<ILogger<AzureRelayListener>>()));
          }
          return services;
      }
  }