code: public Observable<Page<CloudTask>> listAsync(final String jobId, final TaskListOptions taskListOptions) {
          return listWithServiceResponseAsync(jobId, taskListOptions)
              .map(new Func1<ServiceResponseWithHeaders<Page<CloudTask>, TaskListHeaders>, Page<CloudTask>>() {
                  @Override
                  public Page<CloudTask> call(ServiceResponseWithHeaders<Page<CloudTask>, TaskListHeaders> response) {
                      return response.body();
                  }
              });
      }
docs: Lists all of the tasks that are associated with the specified job.
  For multi-instance tasks, information such as affinityId, executionInfo and nodeInfo refer to the primary task. Use the list subtasks API to retrieve information about subtasks.
  
  @param jobId The ID of the job.
  @param taskListOptions Additional parameters for the operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;CloudTask&gt; object