Kent Restaurant

A microservice based system built with Ballerina

Requirements

• Kafka
• Ballerina v0.991 [not tested with version 1.0]

README is slightly outdated 😆

Short overview

The task is to design a fully automated restaurant application, named kent. The system should be able to make bookings, server and handle payment.

Kent consists of a client module and a server which is composed of multiple microservices. Note: communication is done using gRPC.

Client

Client (guest) remotely invokes book function (returns unique reference number) passing the following:

• reservation date
• preferred time
• the number of guests
• expected duration (default 2 hours)

If the place is overbooked, reservation date is moved.

Upon booking, the remote deposit function is used for payment of booking. Returns confirmation code, whether deposit was accepted or not.

Functions

The remote functions mentioned above

Function    : book

Description : Creates a reservation booking

Parameters  : reservation_date          - unix time stamp (?)
              pref_time                 - unix time stamp (?)
              num_guests                - int
              expected_duration         - int (time in seconds)

Return      : reference_number          - string

Function    : deposit

Description : Pay for the reservation

Parameters  : reference_number          - string
              payment_amount            - float

Return      : confirmation_code         - boolean

Services

There are various services that handle guests.

Welcome service

It receives a reference number and if there's an available table, the guests seat instanly. Otherwise, the guests join a waiting list sorted in the order of time the deposit was paid during booking.

Table service

Receives guest information e.g. reference number and can interact with the guests. Possible actions from guest:

• order food/beverages
• request bill -> do payment
• request menu

Ordering:

• guest invokes table->newOrder(orderInfomation)
• table invokes deliver(order) at waiter service
• waiter responds to guest [maybe have a method acceptOrder in client🤷‍]

Waiter service

Doesn't do much other that receive order information from table and give a reponse to guest.