code: public void start(JobLeaderIdActions initialJobLeaderIdActions) throws Exception {
  		if (isStarted()) {
  			clear();
  		}
  
  		this.jobLeaderIdActions = Preconditions.checkNotNull(initialJobLeaderIdActions);
  	}
docs: Start the service with the given job leader actions.
  
  @param initialJobLeaderIdActions to use for job leader id actions
  @throws Exception which is thrown when clearing up old state