public DateTime? GetSchedule(IDefineWork job)
{
lock (WorkSchedule)
{
var scheduledJob = WorkSchedule.Keys.SingleOrDefault(x => x.GetType() == job.GetType());
var scheduledOn = scheduledJob != null ? WorkSchedule[scheduledJob] : (DateTime?)null;
// only return if job is scheduled to run in the past
if (scheduledJob != null && scheduledOn < DateTime.UtcNow)
{
// schedule the next run
var performOn = scheduledOn;
WorkSchedule[scheduledJob] = DateTime.UtcNow.Add(job.Interval);
return performOn;
}
return null;
}
}
private static void ScheduleInternal(IDefineWork job, DateTime onUtc, Exception exception = null)
{
lock (WorkSchedule)
{
var scheduledJob = WorkSchedule.Keys.SingleOrDefault(x => x.GetType() == job.GetType());
var scheduledOn = scheduledJob != null ? WorkSchedule[scheduledJob] : (DateTime?)null;
// only schedule if the job is not already scheduled
if (scheduledJob == null)
{
WorkSchedule.Add(job, onUtc);
}
// or the job should be scheduled sooner than it is scheduled
else if (exception != null && scheduledOn > onUtc)
{
WorkSchedule[scheduledJob] = onUtc;
}
}
}
public void Reschedule(IDefineWork job, DateTime onUtc, Exception exception)
{
ScheduleInternal(job, onUtc, exception);
}
public void Schedule(IDefineWork job, DateTime onUtc)
{
ScheduleInternal(job, onUtc);
}
