public List <Guid> GetInstances(String UserID)
{
if (UserRow.GetClass(UserID) == UserRow.UserIDClass.none)
{
return(new List <Guid>());
}
var query = TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, UserID);
string alternative = UserRow.GetAlternativeUserID(UserID);
if (alternative != null)
{
query = TableQuery.CombineFilters(query, TableOperators.Or,
TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, alternative));
}
var exQuery = new TableQuery <UserRow>().Where(query);
var results = table.ExecuteQuery <UserRow>(exQuery).ToList();
if (results.Count > 20)
{
return(new List <Guid>()); // if this is a very common userID, its probably not a unique user
}
if (results.Count > 0)
{
return(results.Select(x => x.AppinstanceID).ToList());
}
return(new List <Guid>());
}
/// <summary>
/// If this is a new user, returns the list of instances that should be linked.
/// If this is an existing user, it returns null.
/// </summary>
public List <Guid> SaveUser(String UserID, Guid AppinstanceID, DateTime ServerTime)
{
if (!UserRow.IsValidUserID(UserID))
{
return(null);
}
var current = GetInstances(UserID);
if (!current.Contains(AppinstanceID))
{
var batchOp = new TableBatchOperation();
batchOp.Insert(new UserRow(UserID, AppinstanceID)
{
ServerTime = ServerTime
});
table.ExecuteBatch(batchOp);
current.Add(AppinstanceID);
}
return(current);
}