How to use

reset

method

in

org.jgroups.util.Promise

/**
 * Causes all waiting threads to return
 */
public void reset() {
  reset(true);
}

public synchronized AckCollector reset(Collection<Address> expected_acks, Address ... exclude) {
  suspected_mbrs.clear();
  missing_acks.clear();
  addAll(expected_acks, exclude);
  all_acks_received.reset();
  return this;
}

public synchronized AckCollector reset(Collection<Address> expected_acks, Collection<Address> exclude) {
  suspected_mbrs.clear();
  missing_acks.clear();
  addAll(expected_acks, exclude);
  all_acks_received.reset();
  return this;
}

public synchronized void reset(Collection<Address> members) {
  suspected_mbrs.clear();
  missing_acks.clear();
  addAll(members);
  all_acks_received.reset();
}

public void init() throws Exception {
  super.init();
  leave_promise.reset();
}

public void init() throws Exception {
  super.init();
  join_promise.reset();
}

public T getResultWithTimeout(long timeout, boolean reset) throws TimeoutException {
  if(!reset)
    return _getResultWithTimeout(timeout);
  // the lock is acquired because we want to get the result and reset the promise in the same lock scope; if we had
  // to re-acquire the lock for reset(), some other thread could possibly set a new result before reset() is called !
  lock.lock();
  try {
    return _getResultWithTimeout(timeout);
  }
  finally {
    reset();
    lock.unlock();
  }
}

private void waitForUnblock() {
  try {
    flush_unblock_promise.reset();
    flush_unblock_promise.getResultWithTimeout(end_flush_timeout);
  } catch (TimeoutException t) {
    if (log.isWarnEnabled())
      log.warn(localAddress + ": waiting for UNBLOCK timed out after " + end_flush_timeout + " ms");
  }
}

forward_table.put(seqno, msg);
while(running && !flushing) {
  ack_promise.reset();
  forward(msg, seqno, true);
  if(!ack_mode || !running || flushing)

private void startFlush(List<Address> flushParticipants) {
  if (!flushInProgress.get()) {
    flush_promise.reset();
    synchronized(sharedLock) {
      if(flushParticipants == null)

/**
 * Sends a leave request to coord and blocks until a leave response has been received, or the leave timeout has elapsed
 */
protected void sendLeaveReqTo(Address coord) {
  leave_promise.reset();
  leaving=true;
  log.trace("%s: sending LEAVE request to %s", gms.local_addr, coord);
  long start=System.currentTimeMillis();
  sendLeaveMessage(coord, gms.local_addr);
  Boolean result=leave_promise.getResult(gms.leave_timeout);
  long time=System.currentTimeMillis()-start;
  if(result != null)
    log.trace("%s: got LEAVE response from %s in %d ms", gms.local_addr, coord, time);
  else
    log.trace("%s: timed out waiting for LEAVE response from %s (after %d ms)", gms.local_addr, coord, time);
}

  System.out.printf(".");
promise.reset(false);
byte[] req_buf=new byte[PAYLOAD];
req_buf[0]=REQ;

state_promise.reset();
StateTransferInfo state_info=new StateTransferInfo(target, timeout);
long start=System.currentTimeMillis();

if(log.isTraceEnabled())
  log.trace(local_addr + ": flushing (forwarding) " + "::" + key + " to target " + target);
ack_promise.reset();
down_prot.down(forward_msg);
Long ack=ack_promise.getResult(500);

flush_promise.reset();
ArrayList<Address> flushParticipants = null;
synchronized (sharedLock) {

/**
 Attempts to obtain the ping_addr first from the cache, then by unicasting q request to {@code mbr},
 then by multicasting a request to all members.
 */
protected IpAddress fetchPingAddress(final Address mbr) {
  IpAddress ret;
  if(mbr == null)
    return null;
  // 1. Try to get the server socket address from the cache
  if((ret=cache.get(mbr)) != null)
    return ret;
  if(!isPingerThreadRunning()) return null;
  // 2. Try to get the server socket address from mbr (or all, as fallback)
  ping_addr_promise.reset();
  for(Address dest: Arrays.asList(mbr, null)) {
    Message msg=new Message(dest).setFlag(Message.Flag.INTERNAL)
     .putHeader(this.id, new FdHeader(FdHeader.WHO_HAS_SOCK, mbr));
    down_prot.down(msg);
    if((ret=ping_addr_promise.getResult(500)) != null)
      return ret;
    if(!isPingerThreadRunning()) return null;
  }
  return null;
}

/**
 * Determines coordinator C. If C is null and we are the first member, return. Else loop: send GET_CACHE message
 * to coordinator and wait for GET_CACHE_RSP response. Loop until valid response has been received.
 */
protected void getCacheFromCoordinator() {
  Address coord;
  int attempts=num_tries;
  get_cache_promise.reset();
  while(attempts > 0 && isPingerThreadRunning()) {
    if((coord=determineCoordinator()) != null) {
      if(coord.equals(local_addr)) { // we are the first member --> empty cache
        return;
      }
      Message msg=new Message(coord).setFlag(Message.Flag.INTERNAL)
       .putHeader(this.id, new FdHeader(FdHeader.GET_CACHE));
      down_prot.down(msg);
      Map<Address,IpAddress> result=get_cache_promise.getResult(get_cache_timeout);
      if(result != null) {
        cache.addAll(result);
        log.trace("%s: got cache from %s: cache is %s", local_addr, coord, cache);
        return;
      }
    }
    --attempts;
  }
}

if(log.isTraceEnabled())
  log.trace(local_addr + ": flushing (forwarding) " + local_addr + "::" + key + " to coord " + coord);
ack_promise.reset();
down_prot.down(forward_msg);
Long ack=ack_promise.getResult(500);

long  join_attempts=0;
leaving=false;
join_promise.reset();

public synchronized AckCollector reset(Collection<Address> expected_acks, Address ... exclude) {
  suspected_mbrs.clear();
  missing_acks.clear();
  addAll(expected_acks, exclude);
  all_acks_received.reset();
  return this;
}