/// <summary>
/// Adds a scheduled job for automatic execution by this service.
/// </summary>
/// <param name="schedule">A method for computation of occurrences in the schedule, taking last execution as parameter.</param>
/// <param name="executionWrapper">The execution wrapper method to be invoked on each occurence of the job.</param>
/// <returns>The newly scheduled job.</returns>
public ScheduledJob AddScheduledJob(Func <DateTime, DateTime> schedule, JobExecutionWrapper executionWrapper)
{
var entry = new ScheduledJob(schedule, executionWrapper, SystemTime.UtcNow);
_queue.Add(entry);
return(entry);
}
private void TimerCallbackHandler(object data)
{
var waitTime = _head.NextOccurence - DateTime.Now;
var waitMilliseconds = (long)waitTime.TotalMilliseconds;
if (waitMilliseconds > 0)
{
_timer.Change(waitMilliseconds, Timeout.Infinite);
return;
}
ThreadPool.QueueUserWorkItem(WaitCallbackHandler, _head);
_head.Advance();
_queue.Add(_head);
_head = _queue.DeleteMin();
TimerCallbackHandler(null);
}
internal void Start()
{
_head = _queue.DeleteMin();
TimerCallbackHandler(null);
}
