AuctionHub.cs

using Auction.Service.Contracts;
using Auction.Web.Domain.Commands;
using Auction.Web.Domain.Entities;
using Auction.Web.Domain.Queries;
using Auction.Web.Utility;
using AutoMapper;
using Microsoft.AspNet.SignalR;
using Microsoft.AspNet.SignalR.Hubs;
using System;

namespace Auction.Web.Hubs
{
    [HubName("auctionHub")]
    public class AuctionHub : BaseHub
    {
        public void Initialize()
        {
            // find the lot that is currently in auction
            var lot = Query(new SingleActiveLot());
            if (lot != null)
            {
                // Create client version of internal lot entity
                ClientLot clientLot = Mapper.Map<Lot, ClientLot>(lot);
                // calculate remaining time
                TimeSpan remainingTime = lot.GetRemainingTime(DateTime.UtcNow);
                clientLot.TimeRemaining = remainingTime.Ticks / TimeSpan.TicksPerMillisecond;
                clientLot.ProgressRemaining = lot.CalculateProgressRemaining(remainingTime);
                // respond by sending the lot back to the client
                Clients.Caller.AuctionInitialized(clientLot);
            }
            else
            {
                // send dummy lot id 0 telling the user there is no auction active now
            }
        }

        [Authorize]
        public void PlaceBid(PlaceBidRequest placeBidRequest)
        {
            // Authorize attribute means we should have a User
            Guid userId = UserUtility.GetCurrentUserId(Context.Request.GetHttpContext());

            // Place the bid. If succesfull, this Command will Publish an Event that is subscribed by this hub and is sent all Clients
            var bid = ExecuteCommand(new CreateNewBid(userId, placeBidRequest.LotId, placeBidRequest.Price));

            // respond individually to the calling client
            Clients.Caller.BidPlaced(new PlaceBidResult()
            {
                Lot = new ClientLot() { Id = placeBidRequest.LotId },
                BidIsAccepted = bid.IsWinningBid,
                ResultCode = bid.IsWinningBid ? PlaceBidResultCode.None : PlaceBidResultCode.NotAuthorized
            });
        }

        [Authorize]
        public void CancelBid(CancelBidRequest cancelBidRequest)
        {
            // ...
        }

        [Authorize]
        public void FinalizeOrder(ClientOrder orderInfo)
        {
            // ...
        }

        public void ListProducts(int page)
        {
            // ...
        }
    }
}