public async Task StartAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
if (_timer != null && _timer.Enabled)
{
throw new InvalidOperationException("The listener has already been started.");
}
// if schedule monitoring is enabled for this timer job, check to see if we've
// missed an occurrence since we last started
DateTime now = DateTime.UtcNow;
if (_attribute.UseMonitor)
{
if (await _scheduleMonitor.IsPastDueAsync(_timerName, now, _schedule))
{
// we've missed an occurrence so invoke the job function immediately
await InvokeJobFunction(now, true);
}
}
_timer = new System.Timers.Timer
{
AutoReset = false
};
_timer.Elapsed += OnTimer;
DateTime nextOccurrence = _schedule.GetNextOccurrence(now);
TimeSpan nextInterval = nextOccurrence - now;
StartTimer(nextInterval);
}
public async Task StartAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
if (_timer != null && _timer.Enabled)
{
throw new InvalidOperationException("The listener has already been started.");
}
// See if we need to invoke the function immediately now, and if
// so invoke it.
DateTime now = DateTime.Now;
if (_attribute.UseMonitor &&
await _scheduleMonitor.IsPastDueAsync(_timerName, now, _schedule))
{
// If schedule monitoring is enabled for this timer job, check to see if we've
// missed an occurrence since we last started. If we have, invoke it immediately.
_trace.Verbose(string.Format("Function '{0}' is past due on startup. Executing now.", _timerName));
await InvokeJobFunction(now, true);
}
else if (_attribute.RunOnStartup)
{
// The job is configured to run immediately on startup
_trace.Verbose(string.Format("Function '{0}' is configured to run on startup. Executing now.", _timerName));
await InvokeJobFunction(now);
}
// log the next several occurrences to console for visibility
string nextOccurrences = TimerInfo.FormatNextOccurrences(_schedule, 5);
_trace.Verbose(nextOccurrences);
// start the timer
now = DateTime.Now;
DateTime nextOccurrence = _schedule.GetNextOccurrence(now);
TimeSpan nextInterval = nextOccurrence - now;
StartTimer(nextInterval);
}
