Connie's Convenience Store - About Peter Coad

Applying Patterns: Select and Organize Problem-Domain Objects Connie’s Convenience Store 23
Transaction–subsequent transaction
#7. “Transaction–Subsequent Transaction” Pattern transaction patterns
number
date
time
status
aboutMe
Transaction
howMany
howMuch
rankSubsequentTransactions
buildSubsequentTransactions
calcForMe
n 1
SubsequentTransaction
number
date
time
status
aboutMe
calcForMe
rateMe
• Typical object interactions
howMany —> calcForMe calcOverSubsequentTransactions —> calcForMe
howMuch —> calcForMe rankSubsequentTransactions —> rateMe
• Examples
Transaction: agreement, assignment, authorization, contract, delivery, deposit,
incident, inquiry, order, payment, problem, report, purchase, refund, registration,
rental, reservation, sale, shift, shipment, subscription, time charge, title,
withdrawal.
Transaction–subsequent transaction: application-issue; intermediate result–final result;
order-shipment; purchase-payment; reservation-sale; traffic citation–payment.
• Combinations
participant-transaction; place-transaction; specific item–transaction;
transaction–transaction line item; subsequent transaction–subsequent transaction
line item.
• Notes
Work out transactions in time sequence (the order they usually occur in).
If subsequent transaction and its line item objects correspond 1-to-1 with transaction
and its line item objects, combine them.