/// <summary>
/// Gets the current user bookings from the database
/// </summary>
/// <returns>An <c>await</c>able <see cref="Task"/> that will complete when the
/// first set of results are ready</returns>
public Task FetchBookings()
{
var tcs = new TaskCompletionSource <bool>();
_bookingQuery = Query
.Select(FlightsResult)
.From(DataSource.Database(UserSession.Database))
.Where(UsernameProperty.EqualTo(UserSession.Username));
var retVal = tcs.Task;
_cancelToken = _bookingQuery.AddChangeListener(null, (sender, args) =>
{
foreach (var row in args.Rows)
{
var bookings = row.GetArray("flights");
var eventArgs = new BookingsUpdateEventArgs(EnumerateBookings(bookings));
BookingsChanged?.Invoke(this, eventArgs);
}
var oldTcs = Interlocked.Exchange(ref tcs, null);
oldTcs?.SetResult(true);
});
return(retVal);
}
private void OnBookingsChanged()
{
BookingsChanged?.Invoke();
}