docs: private JobPushRequest getNewJob(String taskTrackerNodeGroup, String taskTrackerIdentity) {
  
          JobSender.SendResult sendResult = appContext.getJobSender().send(taskTrackerNodeGroup, taskTrackerIdentity, 1, new JobSender.SendInvoker() {
              @Override
              public JobSender.SendResult invoke(List<JobPo> jobPos) {
  
                  JobPushRequest jobPushRequest = appContext.getCommandBodyWrapper().wrapper(new JobPushRequest());
                  jobPushRequest.setJobMetaList(JobDomainConverter.convert(jobPos));
  
                  return new JobSender.SendResult(true, jobPushRequest);
              }
          });
  
          if (sendResult.isSuccess()) {
              return (JobPushRequest) sendResult.getReturnValue();
          }
          return null;
      }