boolean isWaiting(Client client) {
    int size = myList.size();
    for (int i = 0; i < size; i++) {
      Owner owner = (Owner) myList.get(i);
      if (owner.client == client)
        return true;
    }
    return false;
  }

  boolean isWaiting(Client client) {
    List newList = Collections.synchroniedList(myList);
    synchronized(newList) {
      int size = newList.size();
      for (int i = 0; i < size; i++) {
        Owner owner = (Owner) newList.get(i);
        if (owner.client == client)
          return true;
      }
    }
    return false;
  }

  boolean isWaiting(Client client) {
    List myListCopy = new ArrayList(myList);
    int size = myListCopy.size();
    for (int i = 0; i < size; i++) {
      Owner owner = (Owner)myListCopy.get(i);
      if (myListCopy.contains(owner) && owner.client == client)
        return true;
    }
    return false;
  }