How to use

openBarrierAndResumeStable

method

in

org.jgroups.protocols.pbcast.STATE_TRANSFER

protected void handleViewChange(View v) {
  Address       old_coord;
  List<Address> new_members=v.getMembers();
  boolean       send_up_exception=false;
  this.view=v;
  synchronized(members) {
    old_coord=(!members.isEmpty()? members.get(0) : null);
    members.clear();
    members.addAll(new_members);
    // this handles the case where a coord dies during a state transfer; prevents clients from hanging forever
    // Note this only takes a coordinator crash into account, a getState(target, timeout), where target is not
    // null is not handled ! (Usually we get the state from the coordinator)
    // http://jira.jboss.com/jira/browse/JGRP-148
    if(waiting_for_state_response && old_coord != null && !members.contains(old_coord))
      send_up_exception=true;
  }
  if(send_up_exception) {
    log.warn("%s: discovered that the state provider (%s) left", local_addr, old_coord);
    waiting_for_state_response=false;
    Exception ex=new EOFException("state provider " + old_coord + " left");
    up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(ex)));
    openBarrierAndResumeStable();
  }
  // remove non members from list of members requesting state
  state_requesters.retainAll(new_members);
}

protected void handleException(Throwable exception) {
  if(isDigestNeeded())
    openBarrierAndResumeStable();
  up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(exception)));
}

/** Set the digest and the send the state up to the application */
protected void handleStateRsp(final Digest digest, Address sender, byte[] state) {
  try {
    if(isDigestNeeded()) {
      punchHoleFor(sender);
      closeBarrierAndSuspendStable(); // fix for https://jira.jboss.org/jira/browse/JGRP-1013
      if(digest != null)
        down_prot.down(new Event(Event.OVERWRITE_DIGEST, digest)); // set the digest (e.g. in NAKACK)
    }
    waiting_for_state_response=false;
    stop=System.currentTimeMillis();
    log.debug("%s: received state, size=%s, time=%d milliseconds", local_addr,
         (state == null? "0" : Util.printBytes(state.length)), stop - start);
    StateTransferResult result=new StateTransferResult(state);
    up_prot.up(new Event(Event.GET_STATE_OK, result));
    down_prot.down(new Event(Event.GET_VIEW_FROM_COORD)); // https://issues.jboss.org/browse/JGRP-1751
  }
  catch(Throwable t) {
    handleException(t);
  }
  finally {
    if(isDigestNeeded()) {
      closeHoleFor(sender);
      openBarrierAndResumeStable();
    }
  }
}

protected void handleViewChange(View v) {
  Address       old_coord;
  List<Address> new_members=v.getMembers();
  boolean       send_up_exception=false;
  this.view=v;
  synchronized(members) {
    old_coord=(!members.isEmpty()? members.get(0) : null);
    members.clear();
    members.addAll(new_members);
    // this handles the case where a coord dies during a state transfer; prevents clients from hanging forever
    // Note this only takes a coordinator crash into account, a getState(target, timeout), where target is not
    // null is not handled ! (Usually we get the state from the coordinator)
    // http://jira.jboss.com/jira/browse/JGRP-148
    if(waiting_for_state_response && old_coord != null && !members.contains(old_coord))
      send_up_exception=true;
  }
  if(send_up_exception) {
    log.warn("%s: discovered that the state provider (%s) left", local_addr, old_coord);
    waiting_for_state_response=false;
    Exception ex=new EOFException("state provider " + old_coord + " left");
    up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(ex)));
    openBarrierAndResumeStable();
  }
  // remove non members from list of members requesting state
  state_requesters.retainAll(new_members);
}

protected void handleException(Throwable exception) {
  if(isDigestNeeded())
    openBarrierAndResumeStable();
  up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(exception)));
}

/** Set the digest and the send the state up to the application */
protected void handleStateRsp(final Digest digest, Address sender, byte[] state) {
  try {
    if(isDigestNeeded()) {
      punchHoleFor(sender);
      closeBarrierAndSuspendStable(); // fix for https://jira.jboss.org/jira/browse/JGRP-1013
      if(digest != null)
        down_prot.down(new Event(Event.OVERWRITE_DIGEST, digest)); // set the digest (e.g. in NAKACK)
    }
    waiting_for_state_response=false;
    stop=System.currentTimeMillis();
    log.debug("%s: received state, size=%s, time=%d milliseconds", local_addr,
         (state == null? "0" : Util.printBytes(state.length)), stop - start);
    StateTransferResult result=new StateTransferResult(state);
    up_prot.up(new Event(Event.GET_STATE_OK, result));
    down_prot.down(new Event(Event.GET_VIEW_FROM_COORD)); // https://issues.jboss.org/browse/JGRP-1751
  }
  catch(Throwable t) {
    handleException(t);
  }
  finally {
    if(isDigestNeeded()) {
      closeHoleFor(sender);
      openBarrierAndResumeStable();
    }
  }
}