发送推送通知期间关闭计算机时如何处理Quartz触发

Question

To send push notification daily with the interval of 24 hour, i've use quartz library. But the issue is when my pc is turned off or my network is disconnected, this peace of code is also triggered but my push notification is not send. My question is how can i manage trigger when my pc is turned off or network disconnected? I want to send push notification after my pc is turned on or connected to the internet.

 ITrigger trigger = TriggerBuilder.Create()
                .WithDailyTimeIntervalSchedule
                  (s =>
                     s.WithIntervalInHours(24)
                    .OnEveryDay()
                    .StartingDailyAt(TimeOfDay.HourAndMinuteOfDay(11, 00))
                  )
                .Build();

 scheduler.ScheduleJob(job, trigger);

Answer 1

You need a combination of Misfire Instructions , a JobExecutionException and the DisallowConcurrentExecutionAttribute

1. Set the DisallowConcurrentExecutionAttribute on your Job, this will prevent that your job will executed multiple times at the same time.

    [DisallowConcurrentExecution] public class MyJob : IJob { .... } 

2. Set the Misfire Instruction to your Trigger, this will tell your trigger to fire immediately in case it missed a execution.

    ITrigger trigger = TriggerBuilder.Create() .WithDailyTimeIntervalSchedule (s => s.WithIntervalInHours(24) .OnEveryDay() .StartingDailyAt(TimeOfDay.HourAndMinuteOfDay(11, 00)) .WithMisfireHandlingInstructionFireAndProceed() ) .Build(); 

3. Catch any exception during the execution of your job eg when the internet is not reachable. Then throw a JobExecutionException and tell Quartz that it should fire the trigger again.

    public class MyJob : IJob { public void Execute(IJobExecutionContext context) { try { // connect to internet or whatever..... } catch(Exception) { throw new JobExecutionException(true); } } } 

4. Next time, read the documentation first ;)