c# barcode image generation library DESIGNING OOP SOLUTIONS: MODELING THE OBJECT INTERACTION in Font

Generate Data Matrix in Font DESIGNING OOP SOLUTIONS: MODELING THE OBJECT INTERACTION

CHAPTER 3 DESIGNING OOP SOLUTIONS: MODELING THE OBJECT INTERACTION
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Preconditions: The customer makes a request to rent a movie from the rental clerk. The customer has a membership in the video club and supplies the rental clerk with her membership card and personal identification number (PIN). The customer s membership is verified. The customer information is displayed, and the customer s account is verified to be in good standing. Description: The movie is confirmed to be in stock. Rental information is recorded, and the customer is informed of the due date. Postconditions: None.
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Figure 3-1. Process Movie Rental use case
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The following scenario describes the internal processing of the Process Movie Rental use case: 1. The movie is verified to be in stock. 2. The number of available copies in stock is decremented. 3. The due date is determined. 4. The rental information is recorded. This information includes the movie title, copy number, current date, and due date. 5. The customer is informed of the rental information. This scenario describes the best possible execution of the use case. Because exceptions can occur, a single use case can spawn multiple scenarios. For example, another scenario created for the Process Movie Rental use case could describe what happens when a movie is not in stock. After you map out the various scenarios for a use case, you can create interaction diagrams to determine which classes of objects will be involved in carrying out the functionality of the scenarios. The interaction diagram also reveals what operations will be required of these classes of objects. Interaction diagrams come in two flavors: sequence diagrams and collaboration diagrams.
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CHAPTER 3 DESIGNING OOP SOLUTIONS: MODELING THE OBJECT INTERACTION
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Introducing Sequence Diagrams
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A sequence diagram models how the classes of objects interact with each other over time as the system runs. The sequence diagram is a visual, two-dimensional model of the interaction taking place and is based on a scenario. Figure 3-2 shows a generic sequence diagram.
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Figure 3-2. Generic sequence diagram
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As Figure 3-2 demonstrates, the flow of messages from object to object is represented horizontally. The time flow of the interactions taking place is depicted vertically, starting from the top and progressing downward. Objects are next to each other, and a dashed line extends from each of them downward. This dashed line represents the lifeline of the object. Rectangles on the lifeline represent activations of the object. The height of the rectangle represents the duration of the object s activation. In OOP objects interact by passing messages to each other. An arrow starting at the initiating , object and ending at the receiving object depicts the interaction. A dashed arrow drawn back to the initiating object represents a return message. The messages depicted in the sequence diagram will form the basis of the methods of the classes of the system. Figure 3-3 shows a sample sequence diagram for the Process Movie Rental scenario presented in the previous section.
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CHAPTER 3 DESIGNING OOP SOLUTIONS: MODELING THE OBJECT INTERACTION
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Figure 3-3. Process Movie Rental sequence diagram
As you analyze the sequence diagram, you gain an understanding of the classes of objects that will be involved in carrying out the program processing and what methods you will need to create and attach to those classes. You should also model the classes and methods depicted in the sequence diagram in the class diagram. These design documents must be continually cross-referenced and revised when needed. The sequence diagram in Figure 3-3 reveals that there will be four objects involved in carrying out the Process Movie Rental scenario: The Customer object is an instance of the Customer class and is responsible for encapsulating and maintaining the information pertaining to a customer. The RentalClerk object is an instance of the RentalClerk class and is responsible for managing the processing involved in renting a movie. The RentalItem object is an instance of the RentalItem class and is responsible for encapsulating and maintaining the information pertaining to a video available for rent. The Rental object is an instance of the Rental class and is responsible for encapsulating and maintaining the information pertaining to a video currently being rented.
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