C
C#•2mo ago
acookook

Cron job "0 */30 15-16 * * ?" in Quartz .NET runs also at 16:30 p. m. Is this correct?

I would like to have a job that starts at 15:00, executes also 15:30 and 16:00. Is this possible without creating two jobs in Quartz .NET as ChatGPT says? Also our application executes at 15:00, 15:30, 16:00, 16:30. I don't see how 16:30 fits in my cron job above, but I definetly don't want this. Since other jobs are executing just fine and no other customers reported the problem, I don't neccessary blame the cron generator. Chat GPT suggest having 0 */30 15 * * ? and 0 0 16 * * ? .
1 Reply
acookook
acookookOP•2mo ago
Something I came quickly up 
private static List<string> TransformCron(string cronSchedule, string minutes, string hours)
{
  var originalCronSchedule = new List<string>() { cronSchedule };

  // Both */ (minute interval) and "-" in hour interval need to be present so that we know that the transformation should occur.
  if (!hours.Contains("-") && !minutes.Contains("*/"))
    return originalCronSchedule;

  // Hour string 15-16
  var startEndHour = hours.Split(new char[] { '-' }, StringSplitOptions.RemoveEmptyEntries);

  // Only split by '-'
  if (startEndHour?.Length < 2)
    return originalCronSchedule;

  //15
  var startHour = int.Parse(startEndHour[0]);
  //16
  var endHour = int.Parse(startEndHour[1]);
  //16 - 15
  var difference = endHour - startHour;

  var interMediateCronJob = string.Empty;
  var lastCronJob = string.Empty;

  // Start and end hour are invalid if difference is lower than 0.
  if (difference <= 0)
  {
    return originalCronSchedule;
  }

  interMediateCronJob = difference == 1 ? $"0 {minutes} {startHour} * * ?" : $"0 {minutes} {startHour}-{endHour - 1} * * ?";
    
  lastCronJob = $"0 0 {endHour} * * ?";

  return new List<string>()
  {
    interMediateCronJob,
    lastCronJob
  };
}
private static List<string> TransformCron(string cronSchedule, string minutes, string hours)
{
  var originalCronSchedule = new List<string>() { cronSchedule };

  // Both */ (minute interval) and "-" in hour interval need to be present so that we know that the transformation should occur.
  if (!hours.Contains("-") && !minutes.Contains("*/"))
    return originalCronSchedule;

  // Hour string 15-16
  var startEndHour = hours.Split(new char[] { '-' }, StringSplitOptions.RemoveEmptyEntries);

  // Only split by '-'
  if (startEndHour?.Length < 2)
    return originalCronSchedule;

  //15
  var startHour = int.Parse(startEndHour[0]);
  //16
  var endHour = int.Parse(startEndHour[1]);
  //16 - 15
  var difference = endHour - startHour;

  var interMediateCronJob = string.Empty;
  var lastCronJob = string.Empty;

  // Start and end hour are invalid if difference is lower than 0.
  if (difference <= 0)
  {
    return originalCronSchedule;
  }

  interMediateCronJob = difference == 1 ? $"0 {minutes} {startHour} * * ?" : $"0 {minutes} {startHour}-{endHour - 1} * * ?";
    
  lastCronJob = $"0 0 {endHour} * * ?";

  return new List<string>()
  {
    interMediateCronJob,
    lastCronJob
  };
}

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