Assume you are hired as a software engineer by a financial service provider company and your first assignment is the

following:

$$Design the software to support a computerized banking network including both human cashiers and automatic teller

machines $($ATMs$)$ to be shared by a consortium of banks. Each bank provides its own computer to maintain its own

accounts and process transactions against them. Cashier stations are owned by individual banks and communicate

directly with their own bank$$s computers. Human cashiers enter account and transaction data. Automatic teller machines

communicate with a central computer which clears transactions with the appropriate banks. An ATM accepts a cash

card, interacts with the user, communicates with the central system to carry out the transaction, dispenses cash, and prints

receipts. The system requires appropriate recordkeeping and security provisions. The system must handle concurrent

accesses to the same account correctly. The banks will provide their own software for their own computers; you are to

design the software for the ATMs and the network. The cost of the shared system will be apportioned to the banks

according to the number of customers with cash cards.$$ After some requirement elicitation and initial analysis of the above problem, you came up with a data dictionary

consisting of the following:

$$ Account $$ a single account in a bank against which transactions can be applied. Accounts may be of various

types, at least checking or savings. A customer can hold more than one account.

$$ ATM $$ a station that allows customer to enter their own transactions using cash cards as identification. The

ATM interacts with the customer to gather transaction information, sends the transaction information to the

central computer for validation and processing, and dispenses cash to the user. We assume that an ATM need

not operate independently of the network.

$$ Bank $$ a financial institution that holds accounts for customers and that issues cash cards authorizing access to

accounts over the ATM network.

$$ Bank computer $$ the computer owned by a bank that interfaces with the ATM network and the bank$$s own

cashier stations. A bank may actually have its own internal network of computers to process accounts, but we

are only concerned with one that talks to the network.

$$ Cash card $$ a card assigned to a bank customer that authorizes access of accounts using an ATM machine.

Each card contains a bank code and a card number, most likely coded in accordance with national standards on

credit cards and cash cards. The bank code uniquely identifies the bank within the consortium. The card number

determines the accounts that the card can access. A card does not necessarily access all of a customer$$s accounts.

Each cash card is owned by a single customer, but multiple copies of it may exist, so the possibility of

simultaneous use of the same card from different machines must be considered.

$$ Cashier $$ an employee of a bank who is authorized to enter transactions into cashier stations and accept and

dispense cash and checks to customers. Transactions, cash, and checks handled by each cashier must be logged

and properly accounted for.

$$ Cashier station $$ a station on which cashiers enter transactions for customers. Cashiers dispense and accept

cash and checks; the station prints receipts. The cashier station communicates with the bank computer to validate

and process the transactions.

Carleton University

Department of Systems and Computer Engineering

SYSC$-4120$ Software Architecture and Design Winter $2024$

Laboratory $1$ A review of SYSC $3120$

Page $3$ of $3$

$$ Central computer $$ a computer operated by the consortium which dispatches transactions between the ATMs

and the bank computers. The central computer validates bank codes but does not process transactions directly.

$$ Consortium $$ an organization of banks that commissions and operates the ATM network. The network only

handles transactions for banks in the consortium.

$$ Customer $$ the holder of one or more accounts in a bank. A customer can consist of one or more persons or

corporations; the correspondence is not relevant to this problem. The same person holding an account at a

different bank is considered a different customer.

$$ Transaction $$ a single integral request for operations on the accounts of a single customer. We only specified

that ATMs must dispense cash, but we should not preclude the possibility of printing checks or accepting cash

or checks. We may also want to provide the flexibility to operate on accounts of different customers, although

it is not required yet. The different operations must balance properly.

What to do

Using the requirement definition for the ATM network and the data dictionary above, develop a complete UML class

diagram of the ATM system. Make sure you clearly identify the different classes $($use the data dictionary names$),$

attributes, operations $($if any$),$ and associatiAfter some requirement elicitation and initi