void placeResponse(final int sequence, final ProtocolFrame response) {
    synchronized (myResponseQueue) {
      if (response == null || myResponseQueue.containsKey(sequence)) {
        myResponseQueue.put(sequence, response);
      }
      if (response != null) {
        myResponseQueue.notifyAll();
      }
    }
  }
void placeResponse(final int sequence, final ProtocolFrame response)