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Enhanced Vending Machine Interaction System for Customer and Service Representatives

The Mark I Vending Machine (MIVM) system is designed to streamline interactions between customers and service representatives. It features a comprehensive client interface and coordination layer, ensuring seamless operations. Customers can insert valid bills and coins, select items, and receive refunds effortlessly. The system incorporates a robust protocol for validating transactions and dispensing items. With advanced functionalities, including change mode and coin dispensing policies, the MIVM system enhances user experience while providing detailed income and sales tracking for service representatives.

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Enhanced Vending Machine Interaction System for Customer and Service Representatives

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  1. 1 Service Representative Customer :Mark I Vending Machine (MIVM) System 1..* 1 customer supplier 1..* 1 servicer vending machine

  2. 4 Client Interface Layer Coordination Layer • The model layer contains • 2 packages: • Role package • Dispenser package Model Layer Server Interface Layer Foundation Layer

  3. CurrentModeProxy currentMode valid (aBill) valid (aCoin) doorLocked () selected (aLetter) selected (anInteger) changeMode () refund () 5 BillValidator inserted (aBill) CoinValidator inserted (aCoin) RefundButton pressed () LetterSelectionButtons pressed () NumberSelectionButtons pressed () ModeButton pressed () DoorSwitch tripped () Door locked () CustomOperatingSystemInterrupts event (aString) CLIENT INTERFACE 10 8

  4. CurrentModeProxy curentMode valid (aBill) valid (aCoin) doorLocked () selected (aString) selected (anInteger) changeMode () refund () 6 DispenseItemMode displayMessages () refund () reset () selected (anInteger) selected (aLetter) valid (aMoney) Customer displayMessages () refund () reset () selected (anInteger) selected (aLetter) valid (aMoney) SetPricemode refund () reset () selected (anInteger) selected (aLetter) valid (aMoney) DisplayHistoryMode refund () reset () selected (anInteger) selected (aLetter) valid (aMoney) ServiceRepresentative coinDispenserAssemblyLoaded () displayTotalIncome () displayTotalItemsSold () reset () selected (anInteger) selected (aLetter) MainDisplay display (currentMode) COORDINATION {contains}

  5. 8 CoinDispensingPolicy dispense () isPractical (aPrice) ItemDispensers dispense () price () price (aMoney) CoinSolenoid push () ItemStepperMode step (360) ItemDisplay display (aLocation,aPrice) ItemDispenserassembly dispenseAt (aLocation) priceAt (aLocation) priceAt (aLocation,aPrice) getTotalIncome () getTotalItemsSold () CoinDispenserAssembly isWarningNeeded () dispense (aMoney) inserted (aCoin) loaded () isPractical (aPrice) CoinDispensers haveCoin () coinInserted () next () coinType () dispense () DISPENSER {contains} 3 80 {contains} {contains}

  6. 9 CustomOperatingSystemCalls dispenseCoinFrom (aPort) dispenseItemFrom (aPort) itemDisplay (aString,aPort) mainDisplay (aString) CoinSolenoid push () ItemStepperMotor step (360) ItemDisplay display (aLocation,aPrice) MainDisplay display (aString) SERVER INTERFACE

  7. 11 Precondition: The mode is “DispenseItem”. Postcondition: The mode is “DispenseItem”. Make a Payment. :MIVM Software Insert a Valid Bill Insert a Valid Coin

  8. 12 Precondition: currentMode = dispenseItemMode Customer Inserts a Valid Bill. :Custom- OperatingSystem Interrupts :Custom- Operating- SystemCalls :Bill- Validator :Current- ModeProxy :Dispense- Item- Mode :Customer :Customer- Credit :Customer- Selection :Main- Display inserted (aBill) valid (aBill) valid (aBill) valid (aBill) add (aBill) creditIncremented () [itemSelected] Attempt to Dispense [no itemSelected] display () display (amount) displayMain (amount)

  9. :Coin- Dispenser- Assembly :Coin- Dispensing- Policy 13 Dispense Changes. :Customer- Credit dispense (credit) dispense (credit) [credit >= Money.none () ] Dispense Quarters [credit >= Money.none () ] Dispense Dimes [credit >= Money.none () ] Dispense Nickels Display Greeting

  10. :Coin- Dispensing- Policy :Coin- Dispensers :CustomOperating- SystemCalls aCoin- Dispenser :Coin- Solenoid 14 amountToDispense = credit.amount () Dispense Quarters. If a quarter was dispensed, then amountToDispense = amountToDispense – Coin.quarter () * [amountToDispense >= quarter] next () coinType () * [amountToDispense >= quarter and coinType () = Coin.quarter ()] dispense () push () dispenseCoinFrom (aPort) [quarter = not dispensed] FailedException NoCoinException CouldNotDispenseException

  11. 16 Hacer un Pago. :Software- MEA 1a: Insertar un Billete Válido 1b: Insertar una Moneda Válido

  12. 17 Precondition: currentMode = dispenseItemMode Insert a Valid Bill. :Custom- OperatingSystem- Interrupts 1: inserted (aBill) :Bill- Validator 1.1: valid (aBill) :Current- ModeProxy 1.1.1: valid (aBill) 1.1.1.1.2: credit- Incremented () :Customer- Selection :Customer 1.1.1.1: valid (aBill) :Dispense- Item- Mode 1.1.1.1.1: add (aBill) 1.1.1.1.2.2 [no itemSelected]: display () 1.1.1.1.2.2.1: display (amount) :Customer- Credit :Main- Display 1.1.1.1.2.1 [itemSelected]: 1.1.1.1.2.2.1.1: displayMain (amount) Attempt to Dispense :Custom- Operating- SystemCalls

  13. Dispense Changes. 18 :Coin- Dispenser- Assembly :Customer- Credit 1: dispense (credit) 1.1: dispense (credit) :Coin- Dispensing- Policy 1.1.1 [credit >= Money.none () ]: Dispense Quarters 1.1.2 [credit >= Money.none () ]: Dispense Dimes 1.1.3 [credit >= Money.none () ]: Dispense Nickels 1.1.4: Display Greeting

  14. 19 amountToDispense = credit.amount () Dispense Quarters. If a quarter was dispensed, then amountToDispense = amountToDispense – Coin.quarter () 2: coinType () 3 * [amountToDispense >= quarter and coinType () = Money.quarter ()]: dispense () :Coin- Dispensing- Policy aCoin- Dispenser 3.1.1.1.1.1: CouldNot-DispenseException 3.1.1.1.1: NoCoin-Exception 3.1: push () 1 * [amountToDispense >= quarter]: next () :CustomOperating- SystemCalls 3.1.1: dispenseCoinFrom (aPort) :Coin- Solenoid :Coin- Dispensers 3.1.1.1 [quarter = not dispensed]: FailedException

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