Vending Machine Modeling
2003 Fall Software Design (CSED332)
Oct. 30th, 2003
Pohang University of Science and Technology
(POSTECH)
Copyright © 2003 SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Agenda
Domain Model
Use Case
Collaboration Diagram
Design Class Diagram
Message Sequence Diagram
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Domain Model
Vending Machine Domain Model
modify
Owner
1
1
1
1..*
ItemSpec
price
add or remove item
1..*
push
SelectionButton
1..*
1
add or
remove
money
notifyselection
1
1
*
1
*
notifychangerequest
1
*
1
Insert coin
1
Insert bill
1
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
CoinReceiver
BillReceiver
deposit-money-to
1
1
deposit-money-to
1
1
requestdispense
turn-on or -off
ItemDispenser
1
ItemLight
1
1..*
Inform-total
TransactionManagement
total
requestchangedispense
1
1
quantity
1
Customer
*
1
ItemManagement
Inform-deduction
push
ReturnButton
1
describes-item
display-total-of
1
1
MoneyDisplay
1
add-money
query-if-changeable
1
MoneyCounter
c50_Count
c100_Count
c500_Count
bill_Count
1
Requestdispense
MoneyDispenser
1
Use Case
Vending Machine Use Cases (1)
Actors and their goal
Owner
- to fill items
- to fill money
- to change item (info.)
Customer
- to buy one or more drinks
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Corresponding Use Cases
- Fill Items
- Fill Money
- Change Items
Customer
- Buy Items
Vending Machine Use Cases (2)
Use Case
Use Case: Buy Items
Primary Actor: Customer
Stakeholders:
Tax Collector - interested in collecting correct sales tax
Precondition: Vending Machine (VM) turned on, not in manager mode,
and the numbers of each item contained in VM
greater than zero.
Post-condition: Customer gets one or more items and exact change.
Main Success Scenario
*1. Customer deposits money.
*2. Customer selects an item.
*3. Customer gets change.
At any time, 1~3 can be repeated in arbitrary order.
Term
Definition and Information
manager mode
The mode that the vending machine turns into when the owner changes item information, fills money or
items.
selectable item
If the following three conditions are met, the item is selectable.
- The total amount of money is greater than or equal to the price of the item.
- The difference between the total amount of money and the price of the item is changeable.
- The quantity of the item contained in the VM is greater than zero.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Aliases
Vending Machine Use Cases (3)
Use Case
Use Case: Deposit Money
Primary Actor: Customer
Precondition: Vending machine turned on, not in manager mode
Post-condition: Total amount of money updated
and item lights for selectable items are turned on.
Main Success Scenario
1. Customer inserts a coin or bill.
2. Vending Machine (VM) updates display with the total amount
deposited.
3. VM turns on item lights for selectable items.
Extensions
1a. If an irregular coin or bill is inserted, the VM rejects it.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Vending Machine Use Cases (4)
Use Case
Use Case: Select an Item
Primary Actor: Customer
Precondition: Vending machine turned on, not in manager mode,
and selectable items lighted
Post-condition: Customer gets a selected item if s/he choose
selectable one and the total amount of money is
deducted by the price of the dispensed item.
Main Success Scenario
1. Customer pushes a selection button.
2. If the item corresponds to the pushed button is selectable,
VM dispenses the item and deduct total amount of money by
the price of the item.
3. VM turns on item lights for selectable items
and turns off item lights for not selectable items.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Vending Machine Use Cases (5)
Use Case
Use Case: Get Change
Primary Actor: Customer
Precondition: Vending machine turned on, not in manager mode
Post-condition: User gets exact change.
Total amount of money is updated to zero.
Main Success Scenario
1. Customer push the button to get the change.
2. VM updates money display to zero.
3. VM turns off all item lights.
4. VM returns change.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Vending Machine Use Cases (6)
Use Case
Use Case: Fill Items
Primary Actor: Owner
Precondition: Vending machine turned on, not in use by the user
Post-condition: Item refilled and item number updated
Main Success Scenario
1. Owner opens the cover.
2. Owner fills items.
3. VM counts and updates item numbers.
4. Owner closes the cover.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Vending Machine Use Cases (7)
Use Case
Use Case: Fill Money
Primary Actor: Owner
Precondition: Vending machine turned on and not in use by the user
Post-condition: Money refilled and the amount is updated
Main Success Scenario
1. Owner opens the cover.
2. Owner fills coins and bills into money holders.
3. VM counts and updates money amount.
4. Owner closes the cover.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Vending Machine Use Cases (8)
Use Case
Use Case: Change Items
Primary Actor: Owner
Precondition: Vending machine turned on, not in use by the user
Post-condition: Item price information changed
Main Success Scenario
1. Owner opens the cover.
2. Owner sets new price for items.
3. Owner closes the cover.
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Vending Machine SSD (1)
:Customer
System Sequence Diagram
:System
SSD1 – deposit money
:System
SSD2 – select an item
:System
SSD3 – get change
inserts money( coin or bill )
Money display is updated.
Item lights for selectable items
are turned on.
:Customer
selects an item
selected item dispensed
Money display is updated.
Item lights for selectable items
are turned on.
:Customer
request change
Money display is reset to zero.
All item lights are turned off.
change returned
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
System Sequence Diagram
Vending Machine SSD (2)
:Owner
:System
SSD4 – fill items
:System
SSD5 – fill money
:System
SSD6 – change items
open cover
fill items
close cover
:Owner
open cover
fill money
close cover
:Owner
open cover
modify item price
close cover
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Design Class Diagram
Design Class Diagram of VM
ItemSpec
price: Integer
PriceInputDevice
SelectionButton
1
ItemRefillSensor
setPrice
1
processSelection
1
setQuantity
1..*
getPrice()
setPrice( price )
1
getPrice
1
ItemManagement
1
quantity: Integer
1
totalChanged( total )
setQuantity( num )
processSelection()
ItemDispenser
dispense()
1
dispense
1
turn-on
turn-off
1..*
totalChanged
1
TransactionManagement
deduct, getTotal
ReturnButton
CoinReceiver
BillReceiver
1
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
1
1
deposit
1
total: Integer
addMoney( amount )
deduct( amount )
getTotal()
returnChange()
1
returnChange
addMoney
1
deposit
1
MoneyRefillSensor 1..*
POSTECH
returnChange
1
setMoney
1
1
ItemLight
1
turnOn()
turnOff()
isChangeable
display
1
MoneyDisplay
1
display(num)
MoneyCounter
c50_Count: Integer
c100_Count: Integer
c500_Count: Integer
bill_Count: Integer
isChangeable( amount ): Boolean
deposit( amount )
setMoney( type, count )
returnChange( amount )
1
dispense
MoneyDispenser
1..*
dispense( count )
Deposit Money
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Message Sequence Diagram
Select an Item
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Message Sequence Diagram
Get Change
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
Message Sequence Diagram
Others
Message Sequence Diagram
MSD for Fill Items
MSD for Fill Money
MSD for Change Items
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea
References
•
Craig Larman, Applying UML and Patterns 2nd Ed., 2001, PHPTR
POSTECH
Copyright © 2003
SE Lab. Dept. of CSE
POSTECH, R.O. Korea