/// <summary>
/// Get the event that should be triggered next in the queue
/// based on the curent DateTime or startDate
/// </summary>
/// <param name="startDate">Date on which the recurrence begins</param>
/// <returns></returns>
private WeeklySchedule GetNextEventInQueue(DateTime?startDate)
{
if (_scheduleQueue.Count == 1)
{
return(_scheduleQueue.Peek());
}
DateTime baseDate = startDate ?? DateTime.Now;
DayOfWeek today = baseDate.DayOfWeek;
TimeSpan now = new TimeSpan(0, baseDate.Hour, baseDate.Minute, baseDate.Second, baseDate.Millisecond);
int i = 0;
while (i < _scheduleQueue.Count)
{
WeeklySchedule schedule = _scheduleQueue.Peek();
if (schedule.DayOfWeek < today || (schedule.DayOfWeek == today && schedule.TimeOfDay < now))
{
//Push first element at end
_scheduleQueue.Enqueue(_scheduleQueue.Dequeue());
i++;
}
else
{
return(schedule);
}
}
return(_scheduleQueue.Peek());
}
/// <summary>
/// Return the date of the next occurence to schedule
/// </summary>
/// <param name="startDate">Date on which the recurrence begins</param>
/// <returns></returns>
private DateTime GetNextScheduleDate(DateTime?startDate)
{
if (startDate < DateTime.Now)
{
startDate = DateTime.Now;
}
WeeklySchedule schedule = GetNextEventInQueue(startDate);
DateTime scheduleDate = startDate?.Date ?? DateTime.Now;
while (scheduleDate.DayOfWeek != schedule.DayOfWeek)
{
scheduleDate = scheduleDate.AddDays(1);
}
TimeSpan time = schedule.TimeOfDay;
scheduleDate = new DateTime(scheduleDate.Year, scheduleDate.Month, scheduleDate.Day, time.Hours, time.Minutes, time.Seconds);
if (scheduleDate < DateTime.Now)
{
scheduleDate = scheduleDate.AddDays(7);
}
return(scheduleDate);
}
/// <summary>
/// Initializes a new instance of WeeklyEvent for a specific day / time, starting at a given date,
/// providing an action delegate to invoke on trigger.
/// The event will trigger every week at the provided day and time.
/// </summary>
/// <param name="dayOfWeek">Trigger day</param>
/// <param name="timeOfDay">Trigger time</param>
/// <param name="startDate">Date on which the recurrence begins</param>
/// <param name="action">The action to invoke</param>
public WeeklyEvent(DayOfWeek dayOfWeek, TimeSpan timeOfDay, DateTime startDate, Action action)
{
var schedule = new WeeklySchedule(dayOfWeek, timeOfDay);
_scheduleQueue = new Queue <WeeklySchedule>();
_scheduleQueue.Enqueue(schedule);
ScheduledTime = GetNextScheduleDate(startDate);
if (action != null)
{
_action = action;
}
}