New Perspectives on HTML and CSS: Brief
6th Edition
ISBN: 9781133387268
Author: Patrick M. Carey
Publisher: Cengage Learning US
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using r language
using r language
You are given a class that processes purchases for an online store. The class receives calls to:
•
Retrieve the prices for items from a database
• Record the sold items
•
Update the database
•
Refresh the webpage
a. What architectural pattern is suitable for this scenario? Illustrate your answer by drawing a
model for the solution, showing the method calls/events.
b. Comment on how applying this pattern will impact the modifiability of the system.
c. Draw a sequence diagram for the update operation.
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