public override Task OnDisconnected(bool stopCalled)
{
try
{
_log.Debug("ConnectionId={0}", Context.ConnectionId);
var connection = ConnectionHolder.Get(Context.ConnectionId);
if (connection == null)
{
return(base.OnDisconnected(stopCalled));
}
if (connection.UserId != userId)
{
throw new UnexpectedUserIdException(userId, connection.UserId);
}
Clients.Group(connection.Group).viewerRemoved(connection.Username);
Groups.Remove(connection.Id, connection.Group);
ConnectionHolder.Remove(Context.ConnectionId);
return(base.OnDisconnected(stopCalled));
}
catch (Exception ex)
{ // Not logged by ErrorLoggingPipelineModule.
_log.Error(ex);
throw;
}
}
// Exceptions in Hub methods are logged by ErrorLoggingPipelineModule:
public void StartViewingList(long shoppingListId)
{
_log.Debug("shoppingListId={0}, ConnectionId={1}", shoppingListId, Context.ConnectionId);
string shoppingListIdString = shoppingListId.ToString();
var user = _userService.Get(userId);
if (user == null)
{
throw new UserNotFoundException(userId);
}
var shoppingList = _shoppingListService.Get(shoppingListId); // Attempt to load the ShoppingList to validate that the current user has the appropriate permissions.
ConnectionHolder.AddOrUpdate(Context.ConnectionId, shoppingListIdString, userId, user.Username); // Add a HubConnection for the current user.
Groups.Add(Context.ConnectionId, shoppingListIdString); // Add the current user to the group for the ShoppingList.
Clients.Group(shoppingListIdString).viewerAdded(user.Username); // Inform all clients currently viewing this ShoppingList of the new user that is viewing it.
Clients.Caller.allCurrentViewersReceived(ConnectionHolder.GetAllUsernamesInGroup(shoppingListIdString)); // Send list of all users viewing this ShoppingList to the caller.
}