Task IHostedService.StartAsync(CancellationToken cancellationToken)
{
// timer repeates call to CreateTimeSlots every 24 hours.
TimeSpan interval = TimeSpan.FromHours(24); //.FromMinutes(1);//
//calculate time to run the first time & delay to set the timer
//DateTime.Today gives time of midnight 00.00
var nextRunTime = DateOperations.Today().AddDays(1).AddHours(7); // DateTime.Now.AddMinutes(2);//
var curTime = DateOperations.Now(); // DateTime.Now;
var firstInterval = nextRunTime.Subtract(curTime);
void action()
{
var t1 = Task.Delay(firstInterval, cancellationToken);
t1.Wait(cancellationToken);
//create at expected time
_logger.LogInformation("First service run");
CreateTimeSlots(null);
//now schedule it to be called every 24 hours for future
// timer repeates call to CreateTimeSlots every 24 hours.
_timer = new Timer(
CreateTimeSlots,
null,
TimeSpan.Zero,
interval
);
}
// no need to await this call here because this task is scheduled to run much much later.
Task.Run(action, cancellationToken);
return(Task.CompletedTask);
}
public static Task <List <TimeSlot> > CreateTodayTimeSlots(UULContext context, int hourToStart) => CreateTimeSlotsForDateUTC(context, DateOperations.Today(), hourToStart);