WhiskeyServiceBuilder.cs

    public class WhiskeyServiceBuilder : IServiceBuilder<IWhiskeyService>
    {
        private static WhiskeyServiceBuilder _instance;

        public static WhiskeyServiceBuilder CreateDecoratedService(IServiceFactory factory, INotificationService n, IDistributedLogFactory logFactory, IWhiskeyService w)
        {
            return _instance ?? (_instance = new WhiskeyServiceBuilder(factory, n, logFactory, w));
        }

        private readonly INotificationService _notificationService;
        private readonly IWhiskeyService _whiskeyService;
        private readonly IServiceFactory _serviceFactory;
        private readonly IDistributedLogFactory _logFactory;

        private WhiskeyServiceBuilder(IServiceFactory factory, INotificationService not, IDistributedLogFactory logFactory, IWhiskeyService whis)
        {
            _notificationService = not;
            _whiskeyService = whis;
            _serviceFactory = factory;
            _logFactory = logFactory;
        }

        public IWhiskeyService BuildService(ServiceContext context)
        {
            return new WrappedWhiskeyService(_serviceFactory, context, _notificationService, _logFactory, _whiskeyService);
        }
    }