How to use

isMergeInProgress

method

in

org.jgroups.protocols.pbcast.Merger

@ManagedAttribute(description="Is a merge currently running")
public boolean isMergeInProgress() {return merger.isMergeInProgress();}

/**
 * Invoked upon receiving a MERGE event from the MERGE layer. Starts the merge protocol.
 * See description of protocol in DESIGN.
 * @param views A List of <em>different</em> views detected by the merge protocol, keyed by sender
 */
public void merge(Map<Address, View> views) {
  if(views == null || views.isEmpty()) {
    log.warn("the views passed with the MERGE event were empty (or null); ignoring MERGE event");
    return;
  }
  if(View.sameViews(views.values())) {
    log.debug("MERGE event is ignored because of identical views: %s", Util.printListWithDelimiter(views.values(), ", "));
    return;
  }
  if(isMergeInProgress()) {
    log.trace("%s: merge is already running (merge_id=%s)", gms.local_addr, merge_id);
    return;
  }
  Address merge_leader=determineMergeLeader(views);
  if(merge_leader == null)
    return;
  if(merge_leader.equals(gms.local_addr)) {
    log.debug("%s: I will be the merge leader. Starting the merge task. Views: %s", gms.local_addr, views);
    merge_task.start(views);
  }
  else
    log.trace("%s: I'm not the merge leader, waiting for merge leader (%s) to start merge", gms.local_addr, merge_leader);
}

public Object up(Event evt) {
  switch(evt.getType()) {
    case Event.SUSPECT:
      Object retval=up_prot.up(evt);
      // todo: change this to only accept lists in 4.1
      Collection<Address> suspects=evt.arg() instanceof Address? Collections.singletonList(evt.arg()) : evt.arg();
      Request[] suspect_reqs=new Request[suspects.size()];
      int index=0;
      for(Address mbr: suspects)
        suspect_reqs[index++]=new Request(Request.SUSPECT, mbr);
      view_handler.add(suspect_reqs);
      ack_collector.suspect(suspects);
      merge_ack_collector.suspect(suspects);
      return retval;
    case Event.UNSUSPECT:
      impl.unsuspect(evt.getArg());
      return null;                              // discard
    case Event.MERGE:
      view_handler.add(new Request(Request.MERGE, null, evt.getArg()));
      return null;                              // don't pass up
    case Event.IS_MERGE_IN_PROGRESS:
      return merger.isMergeInProgress();
  }
  return up_prot.up(evt);
}

@ManagedAttribute(description="Is a merge currently running")
public boolean isMergeInProgress() {return merger.isMergeInProgress();}

/**
 * Invoked upon receiving a MERGE event from the MERGE layer. Starts the merge protocol.
 * See description of protocol in DESIGN.
 * @param views A List of <em>different</em> views detected by the merge protocol, keyed by sender
 */
public void merge(Map<Address, View> views) {
  if(views == null || views.isEmpty()) {
    log.warn("the views passed with the MERGE event were empty (or null); ignoring MERGE event");
    return;
  }
  if(View.sameViews(views.values())) {
    log.debug("MERGE event is ignored because of identical views: %s", Util.printListWithDelimiter(views.values(), ", "));
    return;
  }
  if(isMergeInProgress()) {
    log.trace("%s: merge is already running (merge_id=%s)", gms.local_addr, merge_id);
    return;
  }
  Address merge_leader=determineMergeLeader(views);
  if(merge_leader == null)
    return;
  if(merge_leader.equals(gms.local_addr)) {
    log.debug("%s: I will be the merge leader. Starting the merge task. Views: %s", gms.local_addr, views);
    merge_task.start(views);
  }
  else
    log.trace("%s: I'm not the merge leader, waiting for merge leader (%s) to start merge", gms.local_addr, merge_leader);
}

public Object up(Event evt) {
  switch(evt.getType()) {
    case Event.SUSPECT:
      Object retval=up_prot.up(evt);
      // todo: change this to only accept lists in 4.1
      Collection<Address> suspects=evt.arg() instanceof Address? Collections.singletonList(evt.arg()) : evt.arg();
      Request[] suspect_reqs=new Request[suspects.size()];
      int index=0;
      for(Address mbr: suspects)
        suspect_reqs[index++]=new Request(Request.SUSPECT, mbr);
      view_handler.add(suspect_reqs);
      ack_collector.suspect(suspects);
      merge_ack_collector.suspect(suspects);
      return retval;
    case Event.UNSUSPECT:
      impl.unsuspect(evt.getArg());
      return null;                              // discard
    case Event.MERGE:
      view_handler.add(new Request(Request.MERGE, null, evt.getArg()));
      return null;                              // don't pass up
    case Event.IS_MERGE_IN_PROGRESS:
      return merger.isMergeInProgress();
  }
  return up_prot.up(evt);
}