private void recordScheduledSeqno(ID member, long seqno) {
      synchronized (scheduledMcastSeqnos) {
        MessageTracker counter = scheduledMcastSeqnos.get(member);
        if (counter == null) {
          counter = new MessageTracker(seqno);
          scheduledMcastSeqnos.put(member, counter);
        }
        counter.record(seqno);
      }
    }
JGroupsReceiver receives incoming JGroups messages and passes them to a handler. It may be
accessed through JChannel.getReceiver().
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/messenger/JGroupsMessenger.java