Unit 7

Question 1

Dynamic Modeling

Answer 1

Dynamic modeling represents the interaction of the building blocks of the information system with each other and with the outside world to satisfy the behavioral requirements of the system.

Question 2

Dynamic Modeling (interactions, messages, objects, time, order)

Answer 2

Dynamic modeling is also interaction. Unlike the real world in which objects interact in many different ways, residents of a virtual world can only interact through messages
.Dynamic modeling features objects.
Interactions happen in time. Therefore, dynamic modeling must show not onlywho interacts with whom and how, but in whatorder.

Question 3

Review Methods & Messages Graphic

Answer 3

Do it

Question 4

Accessor Operations

Answer 4

Accessor operations change or return the value of an attribute.
•The get operation returns the value of the attribute to the public.
•The set operation changes the value of the attribute.

The syntax of an accessor operation is different from that of a normal operation.
•getName()

Question 5

Parameters and Value

Answer 5

Parameters, or arguments, specify the data that must be supplied to an object to carry out a specific operation:Examples:
•orderDrink(drink, quantity)
•orderAppetizer(Appetizer)
•getMenu()
•orderMainCourse(whisky, on the rocks, many)Return value is the reply that a message may invoke from the receiving object after an operation is complete.

Question 6

Syntax for Method Specification

Answer 6

The exact syntax for declaring operations and sending messages is language dependent.
[Visibility] [Return Type] Name
Public Currency payBill(amount, paymentType)

Question 7

Dynamic Diagrams

Answer 7

Sequence diagram
Emphasizes the order of interactions in time.

Collaboration diagram
Focuses on how the object are organized and what set of messages they must exchange to satisfy a certain behavior.

Statechartdiagram
Traces the results of interactions on the state of objects belonging to a specific class.

Question 8

Sequence Diagram

Answer 8

Sequence diagram represents the interaction between objects, or between actors and objects ordered in time.

A sequence diagram is composed of a timeline, objects that interact across this timeline, and the messages that they exchange.

Question 9

System Sequence Diagram (SSD)

Answer 9

A UML sequence diagram at a high (system) level
Special case for a sequence diagram
Only shows actor and one object
The one object represents the complete system
Shows input & output messaging requirements for a use case

Question 10

Review System Sequence Diagram (SSD) Notation Graphic

Answer 10

Do it

Question 11

Internal Sequence Diagram

Answer 11

An internal sequence diagram at a detailed level
shows actor and all internal objects that make up the system
shows interactions between the objects to implement a use case

Question 12

Review Sequence Diagram Graphic

Answer 12

Do it

Question 13

Sequence Diagram

Answer 13

The objectsacross the top of the diagram are interacting with each other by passing messagesback and forth (horizontal).
An actor is the user whose interactions with the system are described in each of the use cases (horizontal).
The object lifetimerepresents time and starts with the top-most message (vertical).

Question 14

Elements of Sequence Diagram

Answer 14

Actor Instance: outside the system
.Instance Name:ActorName
aCustomer:Customer

Class Instance: inside the system
Instance Name:ClassName

Timeline—dotted vertical line.
Message & Timeline Forking: Specifies alternates.
Message to Self & Looping: Specifiesrepeats.

Question 15

Review Appointment Use Case Graphic & Sequence Diagram

Answer 15

Do it

Question 16

How to Identify Methods for Objects/Classes Using the Sequence Diagram

Answer 16

The sequence diagram already shows the objects/classes required for a use case
The make appointment sequence diagram in the previous slide has 5 objects –services, patients, patient, schedule, and appointmentAny message (arrow) that goes into an object is a method in that object.
Patient object has three arrows pointing to it –instantiate patient, update patient profile, and create appointment
So, the patient class should have the above three as methods
Similarly, you can identify methods for all other objects/classes in the sequence diagram and in all other sequence diagrams, and complete the class diagram you created before

Question 17

Collaboration Diagram

Answer 17

Collaboration diagram is a dynamic diagram that focuses on the organization of objects that must cooperate, by exchanging messages, to satisfy a certain behavior.
Collaboration = Communication.
The best way to arrive at a collaboration diagram is to start from a sequence diagram.

Question 18

Review Collaboration Diagram Graphic

Answer 18

Do it

Question 19

Statechart Diagram

Answer 19

Statechart diagram represents milestones in the lifetime of an object when its state changes.
A state is an object’s condition at a certain stage and from a certain viewpoint. It is a snapshot of the object in a usually important point in time.
Statechart diagram is composed of the states of an object and the flow of events that change its state.

Question 20

Review Treatment Graphic

Answer 20

Do it

Question 21

The Value of Statechart Diagram

Answer 21

Statechartdiagram is the only dynamic model that can illustrate the milestones in the lifetime of oneclass of objects in its entirety.