What happens when quartz sheduler becomes out of scope?

Question

What happens when quartz sheduler becomes out of scope? Will Garbage Collector kills it or it will keep running? Samle code:

namespace Quartz_test
{
    public class SimpleJob : IJob
    {
        public void Execute(IJobExecutionContext context)
        {
            Console.WriteLine("hello there");
        }
    }

    class Program
    {
        static void ScheduleTask()
        {
            // construct a scheduler factory
            ISchedulerFactory schedFact = new StdSchedulerFactory();
            // get a scheduler
            IScheduler scheduler = schedFact.GetScheduler();
            scheduler.Start();
            IJobDetail job = JobBuilder.Create<SimpleJob>()
                .WithIdentity("myJob", "group1")
                .Build();
            ITrigger trigger = TriggerBuilder.Create()
                .WithSimpleSchedule(x => x.WithIntervalInSeconds(10).WithRepeatCount(3))
                .Build();
            scheduler.ScheduleJob(job, trigger);
        }

        static void Main(string[] args)
        {
            ScheduleTask();
            //link to scheduler is lost here
            //how to stop SimpleJob execution?
            //Console.ReadLine();
        }
    }

this code outputs:

hello there
hello there
hello there

All seems OK, but why program never finish even if I comment last Console.ReadLine();?

And last question: how to stop IJob execution if I lost all links to my sceduler

Answer 1

There is a shutdown method in the library.

syntax is

void Shutdown( bool waitForJobsToComplete);

You can use it.

IScheduler scheduler = schedFact.GetDefaultScheduler();
scheduler.Shutdown(false);

You can also use either UnscheduleJob or DeleteJob method.

scheduler.unscheduleJob(new TriggerKey("myJob", "group1"));

or

scheduler.deleteJob(new JobKey("myJob", "group1"));

Here is your program with debugging information. I borrowed code from here

using Quartz;
using Quartz.Impl;
using Quartz.Impl.Matchers;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Quartz_test
{
    public class SimpleJob : IJob
    {
        public void Execute(IJobExecutionContext context)
        {
            Console.WriteLine("hello there");
        }
    }

    class Program
    {

        private static void GetAllJobs(IScheduler scheduler)
        {
            IList<string> jobGroups = scheduler.GetJobGroupNames();
            // IList<string> triggerGroups = scheduler.GetTriggerGroupNames();
            Console.Write("START ===== \n is start? " + scheduler.IsStarted);
            Console.WriteLine("is stop? " + scheduler.IsShutdown);
            foreach (string group in jobGroups)
            {
                var groupMatcher = GroupMatcher<JobKey>.GroupContains(group);
                var jobKeys = scheduler.GetJobKeys(groupMatcher);
                Console.WriteLine();
                foreach (var jobKey in jobKeys)
                {
                    var detail = scheduler.GetJobDetail(jobKey);
                    var triggers = scheduler.GetTriggersOfJob(jobKey);
                    foreach (ITrigger trigger in triggers)
                    {
                        Console.WriteLine("group : " + group);
                        Console.WriteLine("name : " + jobKey.Name);
                        Console.WriteLine("desc : " + detail.Description);
                        Console.WriteLine("trg name : " + trigger.Key.Name);
                        Console.WriteLine("trg group : " + trigger.Key.Group);
                        Console.WriteLine("trg type : " + trigger.GetType().Name);
                        Console.WriteLine("trg state : " + scheduler.GetTriggerState(trigger.Key));
                        DateTimeOffset? nextFireTime = trigger.GetNextFireTimeUtc();
                        if (nextFireTime.HasValue)
                        {
                            Console.WriteLine("next trigger? : " + nextFireTime.Value.LocalDateTime.ToString());
                        }

                        DateTimeOffset? previousFireTime = trigger.GetPreviousFireTimeUtc();
                        if (previousFireTime.HasValue)
                        {
                            Console.WriteLine("previous trigger? : " + previousFireTime.Value.LocalDateTime.ToString());
                        }
                    }
                }
                Console.WriteLine();
            }
            Console.WriteLine("===== END \n");
        }

        static void ScheduleTask() 
        {
            IScheduler scheduler = null;
            IJobDetail job = null;
            ITrigger trigger = null;

            try
            {
                // construct a scheduler factory
                ISchedulerFactory schedFact = new StdSchedulerFactory();
                // get a scheduler
                scheduler = schedFact.GetScheduler();
                scheduler.Start();

                job = JobBuilder.Create<SimpleJob>()
                    .WithIdentity("myJob", "group1")
                    .Build();
                trigger = TriggerBuilder.Create()
                    .WithSimpleSchedule(x => x.WithIntervalInSeconds(10).WithRepeatCount(3))
                    .Build();

                scheduler.ScheduleJob(job, trigger);

                GetAllJobs(scheduler);

            }
            catch (Exception e)
            {
                Console.WriteLine(e.InnerException.ToString());
            }
            finally
            {
                GetAllJobs(scheduler);

                TimeSpan spn = TimeSpan.FromSeconds(100L);
                Thread.Sleep(spn);


                scheduler.Shutdown(true);

            }

        }

        static void Main(string[] args)
        {
            ScheduleTask();
            //link to scheduler is lost here
            //how to stop SimpleJob execution?
            //Console.ReadLine();
        }
    }
}

Best regards, Yaros