How to use

getLow

method

in

org.jgroups.util.Digest$Entry

public void add(Digest digest) {
  if(digest != null) {
    checkSealed();
    Map.Entry<Address,Entry> entry;
    Address key;
    Entry val;
    for(Iterator<Map.Entry<Address,Entry>> it=digest.senders.entrySet().iterator(); it.hasNext();) {
      entry=it.next();
      key=entry.getKey();
      val=entry.getValue();
      add(key, val.getLow(), val.getHighestDeliveredSeqno(), val.getHighestReceivedSeqno());
    }
  }
}

win=createNakReceiverWindow(sender, initial_seqno, val.getLow());
xmit_table.put(sender, win);

low_seqno=val.getLow();

mbr=entry.getKey();
val=entry.getValue();
low=val.getLow();

/**
 * Similar to add(), but if the sender already exists, its seqnos will be modified (no new entry) as follows:
 * <ol>
 * <li>this.low_seqno=min(this.low_seqno, low_seqno)
 * <li>this.highest_delivered_seqno=max(this.highest_delivered_seqno, highest_delivered_seqno)
 * <li>this.highest_received_seqno=max(this.highest_received_seqno, highest_received_seqno)
 * </ol>
 * If the sender doesn not exist, a new entry will be added (provided there is enough space)
 */
public void merge(Address sender, long low_seqno, long highest_delivered_seqno, long highest_received_seqno) {
  if(sender == null) {
    if(log.isErrorEnabled()) log.error("sender == null");
    return;
  }
  checkSealed();
  Entry entry=senders.get(sender);
  if(entry == null) {
    add(sender, low_seqno, highest_delivered_seqno, highest_received_seqno);
  }
  else {
    Entry new_entry=new Entry(Math.min(entry.getLow(), low_seqno),
                 Math.max(entry.getHighestDeliveredSeqno(), highest_delivered_seqno),
                 Math.max(entry.getHighestReceivedSeqno(), highest_received_seqno));
    senders.put(sender, new_entry);
  }
}

/**
 * Adds a digest to this digest. This digest must have enough space to add the other digest; otherwise an error
 * message will be written. For each sender in the other digest, the merge() method will be called.
 */
public void merge(Digest digest) {
  if(digest == null) {
    if(log.isErrorEnabled()) log.error("digest to be merged with is null");
    return;
  }
  checkSealed();
  Map.Entry<Address,Entry> entry;
  Address sender;
  Entry val;
  for(Iterator<Map.Entry<Address,Entry>> it=digest.senders.entrySet().iterator(); it.hasNext();) {
    entry=it.next();
    sender=entry.getKey();
    val=entry.getValue();
    if(val != null) {
      merge(sender, val.getLow(), val.getHighestDeliveredSeqno(), val.getHighestReceivedSeqno());
    }
  }
}

/**
 * Increments the sender's high_seqno by 1.
 */
public void incrementHighestDeliveredSeqno(Address sender) {
  Entry entry=senders.get(sender);
  if(entry == null)
    return;
  checkSealed();
  Entry new_entry=new Entry(entry.getLow(), entry.getHighestDeliveredSeqno() +1, entry.getHighestReceivedSeqno());
  senders.put(sender, new_entry);
}