How to use

MergeData

in

org.jgroups.protocols.pbcast

  View tmp_view=tmp_data.getView();
  if(tmp_view != null) {
    ViewId tmp_vid=tmp_view.getViewId();
  Digest digest=tmp_data.getDigest();
  if(digest != null)
    for(Digest.Entry entry: digest)
return new MergeData(gms.local_addr, new_view, new_digest);

/** Removed rejected merge requests from merge_rsps and coords. This method has a lock on merge_rsps */
protected void removeRejectedMergeRequests(Collection<Address> coords) {
  int num_removed=0;
  for(Iterator<Map.Entry<Address,MergeData>> it=merge_rsps.getResults().entrySet().iterator(); it.hasNext();) {
    Map.Entry<Address,MergeData> entry=it.next();
    MergeData data=entry.getValue();
    if(data.merge_rejected) {
      if(data.getSender() != null)
        coords.remove(data.getSender());
      it.remove();
      num_removed++;
    }
  }
  if(num_removed > 0)
    log.trace("%s: removed %d rejected merge responses", gms.local_addr, num_removed);
}

  tmp_data=merge_rsps.elementAt(i);
  if(log.isDebugEnabled()) log.debug("merge data is " + tmp_data);
  tmp_view=tmp_data.getView();
  if(tmp_view != null) {
    tmp_vid=tmp_view.getVid();
ret=new MergeData(gms.local_addr, new_view, new_digest);
return ret;

if(tuple == null)
  return null;
MergeData merge_data=new MergeData(msg.getSrc(), tuple.getVal1(), tuple.getVal2(), hdr.merge_rejected);
log.trace("%s: got merge response from %s, merge_id=%s, merge data is %s",
     local_addr, msg.getSrc(), hdr.merge_id, merge_data);
if(tuple == null)
  return null;
impl.handleMergeView(new MergeData(msg.getSrc(), tuple.getVal1(), tuple.getVal2()), hdr.merge_id);
break;

  /**
   * Merge all digests into one. For each sender, the new value is max(highest_delivered),
   * max(highest_received). This method has a lock on merge_rsps
   */
  protected MutableDigest consolidateDigests(final View new_view, final List<MergeData> merge_rsps) {
    MutableDigest retval=new MutableDigest(new_view.getMembersRaw());
    for(MergeData data: merge_rsps) {
      Digest tmp_digest=data.getDigest();
      if(tmp_digest != null)
        retval.merge(tmp_digest);
    }
    return retval;
  }
}

private MergeData getMergeResponse(Address sender, ViewId merge_id) {
  Digest         digest;
  View           view;
  MergeData      retval;
  if(sender == null) {
    if(log.isErrorEnabled()) log.error("sender == null; cannot send back a response");
    return null;
  }
  if(merging) {
    if(log.isErrorEnabled()) log.error("merge already in progress");
    retval=new MergeData(sender, null, null);
    retval.merge_rejected=true;
    return retval;
  }
  merging=true;
  setMergeId(merge_id);
  if(log.isDebugEnabled()) log.debug("sender=" + sender + ", merge_id=" + merge_id);
  try {
    digest=gms.getDigest();
    view=new View(gms.view_id.copy(), gms.members.getMembers());
    retval=new MergeData(sender, view, digest);
    retval.view=view;
    retval.digest=digest;
  }
  catch(NullPointerException null_ex) {
    return null;
  }
  return retval;
}

/**
 * Merge all digests into one. For each sender, the new value is min(low_seqno), max(high_seqno),
 * max(high_seqno_seen)
 */
private Digest consolidateDigests(Vector<MergeData> merge_rsps, int num_mbrs) {
  MergeData data;
  Digest tmp_digest;
  MutableDigest retval=new MutableDigest(num_mbrs);
  for(int i=0; i < merge_rsps.size(); i++) {
    data=merge_rsps.elementAt(i);
    tmp_digest=data.getDigest();
    if(tmp_digest == null) {
      if(log.isErrorEnabled()) log.error("tmp_digest == null; skipping");
      continue;
    }
    retval.merge(tmp_digest);
  }
  return retval.copy();
}

  View tmp_view=tmp_data.getView();
  if(tmp_view != null) {
    ViewId tmp_vid=tmp_view.getViewId();
  Digest digest=tmp_data.getDigest();
  if(digest != null)
    for(Digest.Entry entry: digest)
return new MergeData(gms.local_addr, new_view, new_digest);

public void handleMergeResponse(MergeData data, MergeId merge_id) {
  if(!matchMergeId(merge_id)) {
    log.trace("%s: this.merge_id (%s) is different from merge_id %s sent by %s as merge response, discarding it",
         gms.local_addr, this.merge_id, merge_id, data.getSender());
    return;
  }
  merge_rsps.add(data.getSender(), data);
}

MergeData merge_data=new MergeData(msg.getSrc(), hdr.view, hdr.my_digest);
merge_data.merge_rejected=hdr.merge_rejected;
impl.handleMergeResponse(merge_data, hdr.merge_id);
impl.handleMergeView(new MergeData(msg.getSrc(), hdr.view, hdr.my_digest), hdr.merge_id);
down_prot.down(new Event(Event.RESUME_STABLE));
break;

  /**
   * Merge all digests into one. For each sender, the new value is max(highest_delivered),
   * max(highest_received). This method has a lock on merge_rsps
   */
  protected MutableDigest consolidateDigests(final View new_view, final List<MergeData> merge_rsps) {
    MutableDigest retval=new MutableDigest(new_view.getMembersRaw());
    for(MergeData data: merge_rsps) {
      Digest tmp_digest=data.getDigest();
      if(tmp_digest != null)
        retval.merge(tmp_digest);
    }
    return retval;
  }
}

/**
 * If merge_id is not equal to this.merge_id then discard. Else cast the view/digest to all members of this group.
 */
public void handleMergeView(final MergeData data, final MergeId merge_id) {
  if(!matchMergeId(merge_id)) {
    log.trace("%s: merge_ids (mine: %s, received: %s) don't match; merge view %s is discarded",
         gms.local_addr, this.merge_id, merge_id, data.view.getViewId());
    return;
  }
  // only send to our *current* members, if we have A and B being merged (we are B), then we would *not*
  // want to block on a VIEW_ACK from A because A doesn't see us in the pre-merge view yet and discards the view
  List<Address> expected_acks=gms.members.getMembers();
  try {
    gms.castViewChangeAndSendJoinRsps(data.view, data.digest, expected_acks, null, null);
    // if we have flush in stack send ack back to merge coordinator
    if(gms.flushProtocolInStack) { //[JGRP-700] - FLUSH: flushing should span merge
      Message ack=new Message(data.getSender()).setFlag(Message.Flag.OOB, Message.Flag.INTERNAL)
       .putHeader(gms.getId(), new GMS.GmsHeader(GMS.GmsHeader.INSTALL_MERGE_VIEW_OK));
      gms.getDownProtocol().down(ack);
    }
  }
  finally {
    cancelMerge(merge_id);
  }
}

if(tuple == null)
  return null;
MergeData merge_data=new MergeData(msg.getSrc(), tuple.getVal1(), tuple.getVal2(), hdr.merge_rejected);
log.trace("%s: got merge response from %s, merge_id=%s, merge data is %s",
     local_addr, msg.getSrc(), hdr.merge_id, merge_data);
if(tuple == null)
  return null;
impl.handleMergeView(new MergeData(msg.getSrc(), tuple.getVal1(), tuple.getVal2()), hdr.merge_id);
break;

/** Removed rejected merge requests from merge_rsps and coords */
private void removeRejectedMergeRequests(Vector coords) {
  MergeData data;
  for(Iterator it=merge_rsps.iterator(); it.hasNext();) {
    data=(MergeData)it.next();
    if(data.merge_rejected) {
      if(data.getSender() != null && coords != null)
        coords.removeElement(data.getSender());
      it.remove();
      if(log.isDebugEnabled()) log.debug("removed element " + data);
    }
  }
}

/** Removed rejected merge requests from merge_rsps and coords. This method has a lock on merge_rsps */
protected void removeRejectedMergeRequests(Collection<Address> coords) {
  int num_removed=0;
  for(Iterator<Map.Entry<Address,MergeData>> it=merge_rsps.getResults().entrySet().iterator(); it.hasNext();) {
    Map.Entry<Address,MergeData> entry=it.next();
    MergeData data=entry.getValue();
    if(data.merge_rejected) {
      if(data.getSender() != null)
        coords.remove(data.getSender());
      it.remove();
      num_removed++;
    }
  }
  if(num_removed > 0)
    log.trace("%s: removed %d rejected merge responses", gms.local_addr, num_removed);
}

public void handleMergeResponse(MergeData data, MergeId merge_id) {
  if(!matchMergeId(merge_id)) {
    log.trace("%s: this.merge_id (%s) is different from merge_id %s sent by %s as merge response, discarding it",
         gms.local_addr, this.merge_id, merge_id, data.getSender());
    return;
  }
  merge_rsps.add(data.getSender(), data);
}

    + this.merge_id
    + ") is null (sender="
    + data.getSender()
    + ").");
return;

/**
 * If merge_id is not equal to this.merge_id then discard. Else cast the view/digest to all members of this group.
 */
public void handleMergeView(final MergeData data, final MergeId merge_id) {
  if(!matchMergeId(merge_id)) {
    log.trace("%s: merge_ids (mine: %s, received: %s) don't match; merge view %s is discarded",
         gms.local_addr, this.merge_id, merge_id, data.view.getViewId());
    return;
  }
  // only send to our *current* members, if we have A and B being merged (we are B), then we would *not*
  // want to block on a VIEW_ACK from A because A doesn't see us in the pre-merge view yet and discards the view
  List<Address> expected_acks=gms.members.getMembers();
  try {
    gms.castViewChangeAndSendJoinRsps(data.view, data.digest, expected_acks, null, null);
    // if we have flush in stack send ack back to merge coordinator
    if(gms.flushProtocolInStack) { //[JGRP-700] - FLUSH: flushing should span merge
      Message ack=new Message(data.getSender()).setFlag(Message.Flag.OOB, Message.Flag.INTERNAL)
       .putHeader(gms.getId(), new GMS.GmsHeader(GMS.GmsHeader.INSTALL_MERGE_VIEW_OK));
      gms.getDownProtocol().down(ack);
    }
  }
  finally {
    cancelMerge(merge_id);
  }
}