code: public void trackTask(final ServiceTaskBase<?> task) {
  
          LOGGER.trace("track a Task");
  
          this.serviceTasks.add(task);
  
          task.setOnCancelled(this.workerHandler);
          task.setOnSucceeded(this.workerHandler);
          task.setOnFailed(this.workerHandler);
      }
docs: Track a task progression.
  
  @param task the task to track