public void initMessage(PartitionedRegion r, Set recipients, boolean notifyOnly,
      DirectReplyProcessor p) {
    setInternalDs(r.getSystem());
    setDirectAck(false);
    resetRecipients();
    if (recipients != null) {
      setRecipients(recipients);
    }
    regionId = r.getPRId();
    processor = p;
    processorId = p == null ? 0 : p.getProcessorId();
    if (p != null && isSevereAlertCompatible()) {
      p.enableSevereAlertProcessing();
    }
    notificationOnly = notifyOnly;
  }
Empty constructor to satisfy {@link DataSerializer} requirements
geode-core/src/main/java/org/apache/geode/internal/cache/partitioned/RemoveAllPRMessage.java