public AgeUpdatingService(IEnumerable <IBirthday> participants, IDispatcherTimer timer, int capacity = 4)
{
_timer = timer;
_timer.Tick += OnTick;
_participants = new OrderedList <KeyValuePair <TimeSpan, IBirthday> >(capacity, new KeyComparer <TimeSpan, IBirthday>());
_participants.AddRange(participants.Select(p => new KeyValuePair <TimeSpan, IBirthday>(p.DateTimeBirth.TimeOfDay, p)));
if (_participants.Any())
{
TimeSpan nowTime = DateTime.Now.TimeOfDay;
_nextIndex = _participants.BinarySearch(new KeyValuePair <TimeSpan, IBirthday>(nowTime, null));
if (_nextIndex < 0)
{
_nextIndex = ~_nextIndex;
}
TimeSpan interval;
if (_nextIndex >= _participants.Count)
{
_nextIndex = 0;
interval = TimeSpan.FromDays(1) - nowTime + _participants[0].Key;
}
else
{
interval = _participants[_nextIndex].Key - nowTime;
}
StartTimer(interval);
}
}