How do I force a quartz.net job to restart intervall after completion

Question

I have a project where I use TopShelf and TopShelf.Quartz

Following this example I am building my jobs with

                s.         


        

Answer 1

The best way I found is to add simple Job Listener. In my example it reschedules job, just after failure. Of cause you can add delay in .StartAt(DateTime.UtcNow)

public class QuartzRetryJobListner : IJobListener
{
    public string Name => GetType().Name;
    public async Task JobExecutionVetoed(IJobExecutionContext context, CancellationToken cancellationToken = default) => await Task.CompletedTask;
    public async Task JobToBeExecuted(IJobExecutionContext context, CancellationToken cancellationToken = default) => await Task.CompletedTask;


    public async Task JobWasExecuted(
        IJobExecutionContext context,
        JobExecutionException jobException,
        CancellationToken cancellationToken = default)
    {
        if (jobException == null) return;

        // Create and schedule new trigger
        ITrigger retryTrigger = TriggerBuilder.Create()
             .StartAt(DateTime.UtcNow)
             .Build();

        await context.Scheduler.ScheduleJob(context.JobDetail, new[] { retryTrigger }, true);
    }
}

Also, I think it's useful to add class extension

public static class QuartzExtensions
{
    public static void RepeatJobAfterFall(this IScheduler scheduler, IJobDetail job)
    {
        scheduler.ListenerManager.AddJobListener(
            new QuartzRetryJobListner(),
            KeyMatcher.KeyEquals(job.Key));
    }
}

Just for simplify usage.

_scheduler.ScheduleJob(job, trigger);
//In case of failue repeat job immediately
_scheduler.RepeatJobAfterFall(job);