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Operation Contracts in Applying UML and Patterns

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Operation Contracts in Applying UML and Patterns

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Questions and Answers

In a Point of Sale (POS) system, what step follows the cashier entering the item identifier?

System records sale line item (correct)

Cashier repeats steps 3-4 until done

System presents total with taxes calculated

System handles payment

What is the purpose of the 'makeNewSale' operation in the POS domain model?

To calculate the total with taxes

To process a completed sale

To initialize a new sale instance (correct)

To handle customer payment

Which entity in the POS domain model is associated with the 'enterItem' operation?

Sale (correct)

Cashier

Customer

What triggers the system to present the total with taxes calculated in a POS system?

Customer indicates they are done Signup and view all the answers

Which operation in the POS domain model involves 'currentDate(), currentTime(), and nextSaleNum()'?

makeNewSale() Signup and view all the answers

What is the main purpose of the 'Logscompleted' entity in the POS domain model?

To track completed sales Signup and view all the answers

What aspect of the system does an operation contract help identify?

System state changes when an operation happens Signup and view all the answers

What do preconditions in an operation contract describe?

State of objects in the Domain Model before executing the operation Signup and view all the answers

Which section of an operation contract is considered the most important?

Postconditions Signup and view all the answers

What is NOT included in the postconditions section of an operation contract?

Actions to be performed during the operation Signup and view all the answers

What does a domain model help generate when creating an operation contract?

Operation names and parameters Signup and view all the answers

When creating an operation contract, what should be described regarding the system?

State before and after the action, both pre and post conditions Signup and view all the answers

What happens as a postcondition of the 'enterItem' operation?

sli is associated with a ProductDescription based on itemId match Signup and view all the answers

What is an outcome of the 'makePayment' operation postconditions?

's.isComplete' becomes true Signup and view all the answers

What does the 'endSale' operation modify?

's.isComplete' Signup and view all the answers

In the 'enterItem' operation, what is initialized to the input quantity?

'sli.quantity' Signup and view all the answers

What does the 'makePayment' operation associate 'p' with?

'Store' Signup and view all the answers

In the postconditions of 'enterItem', how many associations are created with 'ProductSpecification1'?

None Signup and view all the answers