In Quartz.net, how do I prevent a job running concurrently when using a single IJob?

I am using Quartz.Net within a Windows Service to handle the scheduling of various jobs that I will be running. These jobs live inside of a database and each job is handled by a factory method inside of a separate class library.

I want to prevent the scheduler from running more than 1 of my jobs at a single time, however I can't use the [DisallowConcurrentExecution] attribute because I only have a single IJob in the scheduler - my factory method in a separate library handles the decision of what job to run.

Below is my single IJob:

    public void Execute(IJobExecutionContext context)
    {
        JobDataMap dataMap = context.JobDetail.JobDataMap;
        int jobId = dataMap.GetInt("JobId");
        logger.InfoFormat("Job {0} has been triggered.", jobId);

        //Create a new Job Instance
        JobInstance jobInstance = new JobInstance()
        {
            CreateDate = DateTime.UtcNow,
            ExecutionState = ExecutionState.Running,
            CreateSource = "Agent Scheduler Service",
            Job = new Job() { Id = jobId }
        };

        middlewareRepository.CreateJobInstance(jobInstance);
        var job = jobFactory.GetJobImplementation(jobInstance);

        //execute the job
        job.Execute();
        logger.InfoFormat("Job {0} has been executed.", jobId);
    }

In this, there is a jobId which is my key for my job that I want to only allow a single instance to run at any given time.

This is how I load the jobs:

protected void LoadJobs()
{
    logger.Info("Loading jobs.");
    var jobs = middlewareRepository.GeActiveJobs();

    foreach (var job in jobs)
    {
        IJobDetail jobDetail = JobBuilder.Create<JobDespatcher>()
            .WithIdentity(job.Description)
            .UsingJobData("JobId", job.Id)
            .Build();

        ITrigger trigger = TriggerBuilder.Create()
            .WithCronSchedule(job.CronExpression)
            .Build();

        scheduler.ScheduleJob(jobDetail, trigger);
        logger.InfoFormat("Job with id {0} ({1}) has been scheduled.", job.Id, job.Description);
    }
}

Is there a way within Quartz.net to prevent the same job from running twice based on a key or a piece of data?