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Withdrawal Transaction Use Case. Primary Actor: Customer Pre-conditions: The customer must have a valid ATM card and PIN. Post-conditions: The customer receives the cash amount that he wanted to withdraw, with a receipt, if indicated.

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withdrawal transaction use case
Withdrawal Transaction Use Case

Primary Actor: Customer

Pre-conditions:

The customer must have a valid ATM card and PIN.

Post-conditions:

The customer receives the cash amount that he wanted to withdraw, with a receipt, if indicated.

The customer’s account balance is updated in the system.

Normal flow of events:

1. The customer inserts ATM card into the ATM machine and enters PIN.

2. The system validates the ATM card and PIN .

3. The customer selects the ‘Cash Withdrawal’ option from the Options Menu.

Alternate flow of events:

1. The customer has entered invalid PIN; The

system prompts the customer to

enter a valid PIN.

2. If ATM card is not compatible-The system rejects the ATM card and displays an error message

….

slide12

«local precondition»

Have a license

To motorway tollgate

Go to the station with a friend

Catch the ticket

Buy the ticket

Obliterate the ticket

The friend goes home

Exit to xxxxx

tollgate

Get

luggage

ready

Go home with the car

Study for 5 minutes

Go to Heaven/

Hell ;)

Go to Heaven/Hell ;)

Fill up with fuel

Pay the ticket

Get off the train

Go home with bus

Catch the train

Car crash

Turn on the car

[else]

[on car]

[the tank is full]

[on train]

The train

derail

When the train

arrives

to xxxxx

[else]

[xxxxx is a long way]

slide24

UML Summary

  • UML: a graphical language for modeling and designing software
  • Semi-formal models using syntax and semantics
  • UML 2.0 standard
  • 3 stages of design before coding: business modeling (initiation), requirement analysis (what to do), architecture (how to do it)
  • UML as a family of languages: extensibility - UML for real-time systems, e.g., meta-class, constraints
  • Best open source UML tools: http://apps.open-libraries.com/best-OPEN-source-uml-tools/
slide25

UML Diagrams Summary

  • Use Case Diagram: actor and use cases
    • 2 usage: mainly for requirement (sometimes business modeling), a communication between users, customers, designers
    • 4 elements: actor, system boundary, use cases, association
    • 4 rules to write good use case diagram: less ambiguity, complete, consistent, no design details - cross check with text requirement
    • 3 use case relations: include, extend, generalization/specialization
    • 4 key elements in use cases: name, actor, pre/post conditions, flow (main, alternative flows), sometimes relations with other use cases
slide26

UML Diagrams Summary

  • Sequence diagram: object interactions
    • Requirement analysis – describe use cases, find more objects
    • 4 elements: objects (actor), lifetime, activation, messages
slide27

UML Diagrams Summary

  • Class Diagram: class and class relations
    • Requirement and architecture design
    • 3 elements: name, attribute (optional), operation (optional)
    • 2 types of class relations: association (aggregation/composition), generalization/specialization – inheritance
    • Identify names in the requirement as classes
slide28

UML Diagrams Summary

  • Activity diagram: capture an activity/action -- unit of executable functionality
    • Business modeling, requirement - both data and control flow, concurrent modeling
    • 2 types of elements
    • Activity nodes
      • Parameter nodes
      • Action nodes
      • Control nodes: decision/merge, join/fork, initial/final/flow final
      • Object nodes (pin): value pin, exceptional pin
    • Activity edges
      • Direct, Weight (optional) - the minimum number of tokens that must traverse the edge at the same time
      • Control /object edges
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