Question

I have a service:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] 
public class PremieraInteraction : ServiceInit, IPremieraInteraction
{
    public PremieraInteraction()
    {
        ISchedulerFactory schedFact = new StdSchedulerFactory();
        // get a scheduler
        IScheduler sched = schedFact.GetScheduler();
        sched.Start();

        // construct job info
        IJobDetail jobDetail = JobBuilder.Create<PremieraUpdate>().WithIdentity("PremieraUpdateJob").Build();

        ITrigger trigger =
        TriggerBuilder.Create().WithIdentity("PremieraUpdateTrigger").StartNow().WithSimpleSchedule(
        x => x.WithIntervalInSeconds(10)).Build();

        sched.ScheduleJob(jobDetail, trigger); 
    }

}

This is the job:

public class PremieraUpdate:IJob
    {
        public void Execute(IJobExecutionContext context)
        {
            Debug.WriteLine("Fire");
        }
    }

The problem is that it works only once. Why does the scheduler not repeat every 10 seconds?

Answer 1

I would suggest you to instantiate the factory and scheduler in the Application_Start event of Global.asax.cs and store them in static public properties.

  public class Global : System.Web.HttpApplication
  {
    public static ISchedulerFactory Factory;
    public static IScheduler Scheduler;

    protected void Application_Start(object sender, EventArgs e)
    {
      Factory = new StdSchedulerFactory();
      Scheduler = Factory.GetScheduler();
    }
  }

Now inside the service you can access the scheduler through the Global property.

Ex.

Global.Scheduler

I hope you are using the WCF service to schedule new jobs to the Quartz server that will be typically running in a windows service. Instead of scheduling the job in the constructor you can do that in a method that will take the details of the job and finally schedule and run it.

If you go with this implementation you don’t need to mark the service as singleton.