Use Case Diagrams and Sequence Diagrams

1. Exercise 7.1 (Consider a physical bookstore in a shopping mall or you can make it be an online bookstore)

a. List 3 actors (include in the Use Case diagram layout)

b. List at least 3 use cases. One use case is to purchase items.

(read the suggested examples given in the exercise) Note: You can make changes or deviate from the original idea to fit your layout idea, as long as they fit together.

c. The book says prepare a use case diagram for a physical bookstore checkout system in a shopping mall. I give you permission to make it be an online

bookstore checkout system) if you would like.

d. Prepare a Scenario for each use case (see figure 7.4)

e. Skip the creation of an exception scenario for now.

f. Create a Sequence diagram coresponding to each Scenario

What you should have:

A Use Case Diagram with at least 3 actors (unless vou feel vou need to add more)

Make sure to name your use cases diagram and that it uses the name suggested in the 7.1 exercise or matches the name of the svstem I suggested.

Make sure to have at least 3 or more use cases in the diagram (make sure all actors are connected to at least one of the uses cases in the diagram

Have scenar text lavout encsed in a utined box fr us

A Sequence diagram for each coresponding Scenario

134 Chapter 7 Intention Modeling Use Case: Buy a bevenge Summary: The vending machine delivers a beverage after comer selects and pays for sy inserted Actors: Customer Precondition: The machine is waiting for money to be inserted Description: The machine starts in the waiting state in which displays the message Enter coins. A customer inserts coins into the machine. The machine displays de total value of money entered and lights up the button for the items that can be pur chased for the money inserted. The cost puslesa buto. The machine desse the corresponding item and make change, if the cost of the item is less than the Exceptions: Canceledt. If the customer presses the cancel button before we item has heen selected the customer's money is turned and the machine to the One of the customer presses a buen foran ockcentem "That it is out of stock is diiplayed the machine continues to accept consta selection Inicio If the customer presses for contre the money inserted, the mee You Beste for this players they set The es to accept a selection Nad the charts by the chine can make the correct change the displayed in the machine Pinedition: The machine is a bit Figure 72 Usewdescriwa hehet 7.1.3 Use Case Diagrams - they interact us actors The UML has a graphical notation for summarizing we cases ind Figure 7.3 shows in example. A rectangle contains the use cases for a system with the actors listed on the outside The name of the system may be written near a side of the rectangle. A came within an elipse 7.1. Use Case Models 55 Vending Machine buy beverage Customer perform scheduled maintenance Repair technician mais repairs load hams Stock Clerk Figure 73 Usce diagram for a vending machine de set of the cascada con de Amandeleshenching placed con the consolidaci In the theoretica cach Multiple contiene este cu torp 7.1.4 Guidelines for Use Case Models the function cada de eserleri become du in de