Scheduling Dependent Jobs in Quartz.Net

Question

I need some help. I am trying to figure out how to schedule jobs in Quartz.Net. Jobs in Quartz correspond to tasks in my Web Application, which are each apart of a Job in my Web Application. I want users to be able to launch a Job (WebApplication Context) on demand and have it run immediately or schedule the job in the future and, to possibly repeat on a given interval. I know how all these items are accomplished in Quartz individually, but i am having a hard time putting it all together.

For example, in my web application, I may have a job with several task, in a specific order. I want to be able to schedule these tasks in quartz so that they execute in the same order determined in my Web Application. Does anybody have idea of how to do this? I have read up on Quartz documentation saying to store the next Job in the JobDataMap, Just struggling with it.

I am currently waiting to create Quartz jobs until a user requests to either schedule the Job or Run it. Do you think I should be creating the job and trigger on creation of the task in the Web App and then pulling that information from the task object for scheduling in Quartz?

Answer 1

What you need is the JobChainingJobListener class, which is there to help you create a chain of execution for your jobs in a specific order you desire..

using System;
using System.Text;
using Quartz;
using Quartz.Impl;
using Quartz.Impl.Calendar;
using Quartz.Listener;
using Quartz.Impl.Matchers;
using System.Threading;

namespace QuartzNET.Samples
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create RAMJobStore instance
            DirectSchedulerFactory.Instance.CreateVolatileScheduler(5);
            ISchedulerFactory factory = DirectSchedulerFactory.Instance;

            // Get scheduler and add object
            IScheduler scheduler = factory.GetScheduler();          

            StringBuilder history = new StringBuilder("Runtime History: ");
            scheduler.Context.Add("History", history);

            JobKey firstJobKey = JobKey.Create("FirstJob", "Pipeline");
            JobKey secondJobKey = JobKey.Create("SecondJob", "Pipeline");
            JobKey thirdJobKey = JobKey.Create("ThirdJob", "Pipeline"); 

            // Create job and trigger
            IJobDetail firstJob = JobBuilder.Create<FirstJob>()
                                       .WithIdentity(firstJobKey)
                                       //.StoreDurably(true)
                                       .Build();

            IJobDetail secondJob = JobBuilder.Create<SecondJob>()
                                       .WithIdentity(secondJobKey)                                       
                                       .StoreDurably(true)                                       
                                       .Build();

            IJobDetail thirdJob = JobBuilder.Create<ThirdJob>() 
                                       .WithIdentity(thirdJobKey)
                                       .StoreDurably(true)
                                       .Build();

            ITrigger firstJobTrigger = TriggerBuilder.Create()
                                             .WithIdentity("Trigger", "Pipeline")
                                             .WithSimpleSchedule(x => x
                                                 .WithMisfireHandlingInstructionFireNow()
                                                .WithIntervalInSeconds(5)    
                                                .RepeatForever())
                                             .Build();

            JobChainingJobListener listener = new JobChainingJobListener("Pipeline Chain");
            listener.AddJobChainLink(firstJobKey, secondJobKey);
            listener.AddJobChainLink(secondJobKey, thirdJobKey);            

            scheduler.ListenerManager.AddJobListener(listener, GroupMatcher<JobKey>.GroupEquals("Pipeline"));

            // Run it all in chain
            scheduler.Start();
            scheduler.ScheduleJob(firstJob, firstJobTrigger);
            scheduler.AddJob(secondJob, false, true);
            scheduler.AddJob(thirdJob, false, true);

            Console.ReadLine();
            scheduler.Shutdown();
            Console.WriteLine("Scheduler shutdown.");
            Console.WriteLine(history);
            Console.ReadLine();
        }
    }

    class FirstJob : IJob
    {
        public void Execute(IJobExecutionContext context)
        {
            var history = context.Scheduler.Context["History"] as StringBuilder;
            history.AppendLine();
            history.AppendFormat("First {0}", DateTime.Now);            
            Console.WriteLine("First {0}", DateTime.Now);
        }
    }

    class SecondJob : IJob 
    {
        public void Execute(IJobExecutionContext context)
        {
            var history = context.Scheduler.Context["History"] as StringBuilder;
            history.AppendLine();
            history.AppendFormat("Second {0}", DateTime.Now);
            Console.WriteLine("Second {0}", DateTime.Now);            
        }
    }

    class ThirdJob : IJob
    {
        public void Execute(IJobExecutionContext context)
        {
            var history = context.Scheduler.Context["History"] as StringBuilder;
            history.AppendLine();
            history.AppendFormat("Third {0}", DateTime.Now);
            Console.WriteLine("Third {0}", DateTime.Now);
            Console.WriteLine();
        }
    }
}