Simple reminder of component's responsibility

Which create order for thurty Xebian, who register the order into one redis DB with a limited TTL.

Which must be called by the server in order to honour the order. It change the order into Redis with the information of whom performed it.

which receive the beverages and if all is ok in redis, will increase the count of +1

receive order and call the Bar in order to serve the beverage. Then call the checker in order to register the orders and increase its score.