public interface ManageableSlotMachine extends SlotMachine {

  /**
   * Refill the drinks into the specified slot.
   *
   * @param drink the drink to refill
   * @param slot the slot index
   * @param amount the amount of the drinks to fill
   */
  void refill(Drink drink, int slot, int amount);

  /**
   * Set up the coins in the coin box (to change and save the charged coins).
   *
   * @param coin the coin
   * @param amount the amount of coins in the coin box
   */
  void setupCoinBox(Coin coin, int amount);
}