code: public void addJobListener (@Nonnull final IJobListener aJobListener)
    {
      ValueEnforcer.notNull (aJobListener, "JobListener");
  
      try
      {
        m_aScheduler.getListenerManager ().addJobListener (aJobListener, EverythingMatcher.allJobs ());
      }
      catch (final SchedulerException ex)
      {
        throw new IllegalStateException ("Failed to add job listener " + aJobListener.toString (), ex);
      }
    }
docs: Add a job listener for all jobs.
  
  @param aJobListener
  The job listener to be added. May not be <code>null</code>.