/// <summary>
/// Adds the core services required for OpenTracing without any actual instrumentations.
/// </summary>
public static IServiceCollection AddOpenTracingCoreServices(this IServiceCollection services, Action <IOpenTracingBuilder> builder = null)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
services.TryAddSingleton <ITracer>(GlobalTracer.Instance);
services.TryAddSingleton <IGlobalTracerAccessor, GlobalTracerAccessor>();
services.TryAddSingleton <DiagnosticManager>();
services.TryAddEnumerable(ServiceDescriptor.Singleton <IHostedService, InstrumentationService>());
var builderInstance = new OpenTracingBuilder(services);
builder?.Invoke(builderInstance);
return(services);
}