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Ch 5 Presentation

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  • 1. Ch 5 PresentationOrganizing an Object Model
    David Morales
  • 2. How to Organize an Object Model
    Complete each task in the proper order
    Include proper amount of detail in each step
    Revise and edit
    Ensure data is correct and all necessary info is included
    Add additional information where needed
    Ensure all subsequent steps reflect update
    Example: if an additional class is needed, then all following steps need to show the new class
  • 3. Steps for Creating an Object Model
    Tasks in order
    Identify and define objects
    Define Relationships between objects
    Create a Relationship diagram
    Indentify the actors and use cases
    Create a Use Case Diagram
  • 4. Steps for Creating an Object Model
    Tasks in order (continued)
    Identify cardinality and UML Notation
    Create a Class Diagram
    Create a Sequence Diagram
    Create a Sate Transition Diagram
    Create an Activity Diagram
  • 5. Steps for Creating an Object Model
    All tasks are sequential
    Each step depends on data generated from previous steps
    Additional information can be added to a previous task regardless of what step of the process you are on
    Updates must be reflected in all the tasks that follow the task that was updated
  • 6. Identify and Define Objects
    Objects represent a real person, place, event, or transaction
    Each object contains attributes, methods, and messages
    Attributes describe the class
    Methods are tasks and functions the object can perform when it receives a message
    A message is a command
  • 7. Identify and Define Objects
    Steps:
    1. Add new student instance
    2. Record employee number
    3. Record employee name
    4. Record address
    5. Record telephone number
    6. Record date of birth
    7. Record sex
    8. Record title, rate of pay
    9. Record deductions
    10. Record state
    11. Save new employee data
    Method:
    ADD EMPLOYEE
    EMPLOYEE
    Attributes
    Employee number
    Employee name
    Address
    Telephone number
    Date of birth
    Sex
    Title, rate of pay
    Deductions
    State
    Methods
    Add new
    Change name
    Change address
    Change Telephone
    Change deductions
    Change state
    Characteristics that describe the EMPLOYEE object
    Tasks that the EMPLOYEE object can perform
    Objects and methods are represented visually
    Object
    Method
    Message: ADD NEW
    Tells the EMPLOYEE class to perform all the steps needed to add an EMPLOYEE
  • 8. Identify and Define Objects
    EMPLOYEE
    Attributes
    Employee number
    Employee name
    Address
    Telephone number
    Date of birth
    Sex
    Title, rate of pay
    Deductions
    State
    Methods
    Add new
    Change name
    Change address
    Change Telephone
    Change deductions
    Change state
    Characteristics that describe the EMPLOYEE object
    Tasks that the EMPLOYEE object can perform
    Each object can have different instances
    There are many employees, each employee has his/her own record
    Instances of EMPLOYEE Object
    0392
    David Morales
    9408 Worman Dr, Stafford
    555-555-5555
    29Mar1983
    Male
    Help Desk Tech, 35k
    0
    VA
    0023
    Melissa Barnes
    1020 Fleet St, Stafford
    555-555-1254
    03Aug1971
    Female
    Accounting Manager, 75k
    3
    VA
  • 9. Define Relationships between Objects
    Relationships enable objects to communicate and interact as the perform functions and transactions
    They describe
    What objects need to know about each other
    How they respond to changes in other objects
    The effects of member ship in classes, superclasses and sub-classes
  • 10. Define Relationships between Objects
    EMPLOYEE
    Attributes
    Employee number
    Address
    Telephone number
    Title, rate of pay
    Deductions
    State
    PERSON
    MANAGER
    Attributes
    Name
    Date of birth
    Attributes
    Methods
    Add new
    Change name
    Change address
    Change Telephone
    Change deductions
    Change state
    Methods
    Breath
    Eat
    Sleep
    Objects belong to classes, classes belong to superclasses, and classes can have sub-classes
    Class
    Class name
    Superclass
    Superclass name
    Uncommon attributes
    Sub-class
    Common attributes
    Sub-class name
    Belongs to
    Uncommon attributes
    Belongs to
    Common methods
    Uncommon methods
    Uncommon methods
  • 11. Create Object Relationship Diagram
    EMPLOYEE
    DIRECTOR
    OFFICE STAFF
    MANAGER
    Provides a visual overview of the system and the relationships between the various objects within
    Below is a partial diagram
    Is a
    Supervises
    Supervises
  • 12. Identify the Actors and Use Case
    An actor is an external entity
    An actor initiates a use case by requesting information
    A use case represents the steps in a specific business function or process
    Issues
    Generate Paycheck
    Employee
  • 13. Use Case Diagram
    Visual summary of several related use cases
    Initiates
    Create Timesheet Entry
    Notifies
    Department head
    Issues
    Notifies
    Generate Paycheck
    Initiates
    Calculate payroll
    Employee
    Payroll clerck
  • 14. Identify cardinality
    Cardinality describes how instances of one class relate to instances of another class
    Example: An employee can have no payroll deductions or many payroll deductions, thus it would be a zero or many relationship
    Example: An employee may have one spouse or no spouse, thus it would be a zero to one relationship
  • 15. Identify Cardinality – UML Notation
    How cardinality is noted with UML
    1
    0..*
    1
    0..1
    1
    1
    1
    1..*
  • 16. Class Diagram
    Represents a detailed view of a single use case
    Shows the classes the participate in the use case
    Documents the relationships among the classes
    Maintained for
    1
    0..*
    1
    Manages
    0..*
    Notifies
    1
    0..*
    Submits
    Based on
    1
    1..*
    1..*
    1
  • 17. Sequence Diagram
    Dynamic model of a use case
    Shows the interaction among classes during a specified time period
    Graphically documents the use case by showing the classes, messages and the timing of messages
  • 18. Sequence Diagram
    EMPLOYEE
    STOCK TRANSFER
    PAYROLLACTION
    Sequence diagram for CHANGE CONTRIBUTIONS function
    Change Contributions
    Change Contributions
  • 19. State Transition Diagram
    Shows how an object changes from one state to another
    Depends on events that affect the object
    All possible states must be shown in the diagram
    Example for EMPLOYEE object
    Future
    Current
    Past
    Retires
    Prospective
    hire
    Quits
    Meets
    Requirements
    Gets fired
  • 20. Activity Diagram
    Resembles a horizontal flow chart
    Show the actions and events as the occur
    Show the order in which actions take place and identify outcomes
    Activity diagram for CHANCE CONTRIBUTIONS scenario
    Change stock purchase deduction
    Change employee deduction
    Employee changes contributions
    Start
    End