How to use

hasResult

method

in

org.jgroups.util.Promise

protected boolean installViewIfValidJoinRsp(final Promise<JoinRsp> join_promise, boolean block_for_rsp) {
  boolean success=false;
  JoinRsp rsp=null;
  try {
    if(join_promise.hasResult())
      rsp=join_promise.getResult(1, true);
    else if(block_for_rsp)
      rsp=join_promise.getResult(gms.join_timeout, true);
    return success=rsp != null && isJoinResponseValid(rsp) && installView(rsp.getView(), rsp.getDigest());
  }
  finally {
    if(success)
      gms.sendViewAck(rsp.getView().getCreator());
  }
}

boolean shouldWaitForUnblock = flush_supported && receive_blocks && !singletonMember && !flush_unblock_promise.hasResult();
if(shouldWaitForUnblock){
  try{

protected boolean installViewIfValidJoinRsp(final Promise<JoinRsp> join_promise, boolean block_for_rsp) {
  boolean success=false;
  JoinRsp rsp=null;
  try {
    if(join_promise.hasResult())
      rsp=join_promise.getResult(1, true);
    else if(block_for_rsp)
      rsp=join_promise.getResult(gms.join_timeout, true);
    return success=rsp != null && isJoinResponseValid(rsp) && installView(rsp.getView(), rsp.getDigest());
  }
  finally {
    if(success)
      gms.sendViewAck(rsp.getView().getCreator());
  }
}