code: SchedulingResult scheduleOnce(
              TaskIterator taskIterator,
              List<VirtualMachineLease> newLeases) throws IllegalStateException {
          checkIfShutdown();
          try (AutoCloseable ignored = stateMonitor.enter()) {
              return doScheduling(taskIterator, newLeases);
          } catch (Exception e) {
              logger.error("Error with scheduling run: " + e.getMessage(), e);
              if (e instanceof IllegalStateException) {
                  throw (IllegalStateException) e;
              } else {
                  logger.warn("Unexpected exception: " + e.getMessage());
                  throw new IllegalStateException("Unexpected exception during scheduling run: " + e.getMessage(), e);
              }
          }
      }
docs: /* package