public static bool UpdateStatus(UserStatusModel userStatus)
{
if (userStatus == null || string.IsNullOrEmpty(userStatus.Token) || userStatus.Token.Length != 32 || !Enum.IsDefined(typeof(UserStatusEnum), userStatus.Status))
return false;
userStatus.LastUpdated = DateTime.UtcNow;
string uriString = ConfigurationManager.AppSettings["SQLSERVER_CONNECTION_STRING"];
using (UserStatusDataContext context = new UserStatusDataContext(uriString))
{
UserStatus user = context.UserStatus.FirstOrDefault(x => x.UserHash == userStatus.Token);
if (user != null)
{
if (user.Status == userStatus.Status)
return true;
user.Status = userStatus.Status;
user.LastUpdated = DateTime.UtcNow;
HttpRuntime.Cache.Remove(userStatus.Token);
}
else
{
context.UserStatus.InsertOnSubmit(new UserStatus { UserHash = userStatus.Token, Status = userStatus.Status, LastUpdated = DateTime.UtcNow });
}
context.SubmitChanges(ConflictMode.ContinueOnConflict);
}
return true;
}
public static UserStatusModel GetStatus(string token)
{
if (string.IsNullOrEmpty(token) || token.Length != 32)
return null;
UserStatusModel model = HttpRuntime.Cache.Get(token) as UserStatusModel;
if (model == null)
{
string uriString = ConfigurationManager.AppSettings["SQLSERVER_CONNECTION_STRING"];
using (UserStatusDataContext context = new UserStatusDataContext(uriString))
{
UserStatus user = context.UserStatus.FirstOrDefault(x => x.UserHash == token);
model = new UserStatusModel
{
Status = user == null ? (int) UserStatusEnum.Unknown : user.Status,
LastUpdated = user == null ? new DateTime().ToUniversalTime() : user.LastUpdated,
Token = token
};
// these are some basic sanity checks in the case where someone stopped using the client for long periods of time
if (model.Status == (int) UserStatusEnum.Active && (DateTime.UtcNow - model.LastUpdated) > TimeSpan.FromDays(2))
model.Status = (int) UserStatusEnum.Unknown;
if (model.Status == (int) UserStatusEnum.Away && (DateTime.UtcNow - model.LastUpdated) > TimeSpan.FromDays(7))
model.Status = (int) UserStatusEnum.Unknown;
if (model.Status == (int) UserStatusEnum.Busy && (DateTime.UtcNow - model.LastUpdated) > TimeSpan.FromDays(1))
model.Status = (int) UserStatusEnum.Unknown;
if (model.Status == (int) UserStatusEnum.Idle && (DateTime.UtcNow - model.LastUpdated) > TimeSpan.FromHours(4))
model.Status = (int) UserStatusEnum.Unknown;
}
HttpRuntime.Cache.Add(token, model, null, Cache.NoAbsoluteExpiration, TimeSpan.FromHours(24), CacheItemPriority.Normal, null);
}
return model;
}
public HttpResponseMessage Post(UserStatusModel userStatus)
{
if (ModelState.IsValid && StatusService.UpdateStatus(userStatus))
{
// tell the hub connections about this event during the transition!
IHubContext context = GlobalHost.ConnectionManager.GetHubContext<StatusHub>();
StatusService.NotifyStatusSubscribers(context.Clients, userStatus);
return new HttpResponseMessage(HttpStatusCode.Accepted);
}
return new HttpResponseMessage(HttpStatusCode.BadRequest);
}
public bool UpdateStatus(UserStatusModel userStatus)
{
if (!StatusService.UpdateStatus(userStatus))
return false;
StatusService.NotifyStatusSubscribers(Clients, userStatus);
return true;
}
public static void NotifyStatusSubscribers(IHubConnectionContext hubContext, UserStatusModel userStatus)
{
hubContext.Group(userStatus.Token).StatusChanged(userStatus);
}