code: private JobInfo getJob(UUID jobId) {
      JobInfo job = jobs.get(jobId);
      if (job == null) {
        job = new JobInfo(jobId);
        jobs.put(jobId, job);
        jobQueue.add(jobId);
      }
      return job;
    }
docs: Gets the bookkeeping information for a job.  If the specified job has
  not been seen, a new <code>JobInfo</code> is created for it.
  @param jobId The <code>UUID</code> of the job for which to obtain the
  corresponding <code>JobInfo</code>.
  @return The <code>JobInfo</code> for the specified job.