/// <summary>
/// Constructs a new instance based on the schedule expression passed in.
/// </summary>
/// <param name="expression">A schedule expression. This can either be a 6 field crontab expression
/// <a href="http://en.wikipedia.org/wiki/Cron#CRON_expression"/> or a <see cref="TimeSpan"/>
/// string (e.g. "00:30:00").</param>
public TimerTriggerAttribute(string expression)
{
CronSchedule cronSchedule = null;
if (CronSchedule.TryCreate(expression, out cronSchedule))
{
Schedule = cronSchedule;
DateTime[] nextOccurrences = cronSchedule.InnerSchedule.GetNextOccurrences(DateTime.Now, DateTime.Now + TimeSpan.FromMinutes(1)).ToArray();
if (nextOccurrences.Length > 1)
{
// if there is more than one occurrence due in the next minute,
// assume that this is a sub-minute constant schedule and disable
// persistence
UseMonitor = false;
}
else
{
UseMonitor = true;
}
}
else
{
TimeSpan periodTimespan = TimeSpan.Parse(expression);
Schedule = new ConstantSchedule(periodTimespan);
// for very frequent constant schedules, we want to disable persistence
UseMonitor = periodTimespan.TotalMinutes >= 1;
}
}
public void NullExpression_ReturnsFalseAndNullcronSchedule()
{
var result = CronSchedule.TryCreate(null, out CronSchedule schedule);
Assert.Null(schedule);
Assert.False(result);
}
public void ToString_ReturnsExpectedValue()
{
var result = CronSchedule.TryCreate("0 59 11 * * 1-5", out CronSchedule schedule);
Assert.True(result);
Assert.Equal("Cron: '0 59 11 * * 1-5'", schedule.ToString());
}
public void GetNextOccurrence_FivePartCronExpression_NowEqualToNext_ReturnsCorrectValue()
{
CronSchedule.TryCreate("* * * * *", out CronSchedule schedule);
var now = schedule.GetNextOccurrence(DateTime.Now);
var next = schedule.GetNextOccurrence(now);
Assert.True(next > now);
}
public void ShouldDisableScheduleMonitor_ReturnsExpectedValue(string schedule, string nowTimestamp, bool expected)
{
DateTime now;
if (!string.IsNullOrEmpty(nowTimestamp))
{
now = DateTime.Parse(nowTimestamp);
}
else
{
now = DateTime.Now;
}
CronSchedule.TryCreate(schedule, out CronSchedule cronSchedule);
Assert.Equal(expected, TimerSchedule.ShouldDisableScheduleMonitor(cronSchedule, now));
}
public void GetNextOccurrence_ThreeDaySchedule_MultipleScheduleIterations()
{
// 11:59AM on Mondays, Tuesdays, Wednesdays, Thursdays and Fridays
CronSchedule.TryCreate("0 59 11 * * 1-5", out CronSchedule schedule);
DateTime now = new DateTime(2015, 5, 23, 9, 0, 0);
TimeSpan expectedTime = new TimeSpan(11, 59, 0);
for (int i = 1; i <= 5; i++)
{
DateTime nextOccurrence = schedule.GetNextOccurrence(now);
Assert.Equal((DayOfWeek)i, nextOccurrence.DayOfWeek);
Assert.Equal(expectedTime, nextOccurrence.TimeOfDay);
now = nextOccurrence + TimeSpan.FromSeconds(1);
}
}
