code: public List<Integer> getThisWorkerTasks() {
      List<Integer> retval = new LinkedList<>();
      retval.add(delegate.getThisTaskId());
      return retval;
    }
docs: Gets all the task ids that are running in this worker process
  (including the task for this task).
  In Heron parlance, since every instance is running as a seperate process
  this will just return the current instance's taskId
  @return the worker task