private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
          getScheduleStartDateFieldBuilder();
          getScheduleEndDateFieldBuilder();
          getStartTimeOfDayFieldBuilder();
          getEndTimeOfDayFieldBuilder();
          getRepeatIntervalFieldBuilder();
        }
      }
<pre>
Transfers can be scheduled to recur or to run just once.
</pre>

Protobuf type {@code google.storagetransfer.v1.Schedule}
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java