{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

SElec-6 Design - LECTURE 6 Object Oriented Design Ivan...

Info icon This preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Ivan Marsic Rutgers University LECTURE 6: Object Oriented Design
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 Topics Assigning Responsibilities to Objects Design Principles Expert Doer High Cohesion Low Coupling Business Policies Class Diagram
Image of page 2
3 select function(“unlock") : System User «initiating actor» prompt for the key enter key verify key signal: valid key, lock open open the lock, turn on the light Timer «offstage actor» start ("duration“) System Sequence Diagrams considered interactions between the actors We already worked with interaction diagrams: System Sequence Diagrams System Sequence Diagrams
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Design: Object Interactions • System Sequence Diagrams considered interactions between the actors Object Sequence Diagrams consider interactions between the objects checkKey() sk := getNext() alt Controller : LockCtrl setOpen(true) : Checker : KeyStorage val == null : setLit(true) val != null [else] select function(“unlock") : System User «initiating actor» prompt for the key enter key verify key signal: valid key, lock open open the lock, turn on the light Timer «offstage actor» start ("duration“) ystem System Sequence Diagram Design Sequence Diagram
Image of page 4
5 Metaphor for Software Design: “Connecting  the Dots” :Notifier :DatabaseConn Database Landlord Resident :Archiver :Controller :SearchRequest :InterfacePage :PageMaker :InvestigRequest We start with objects/concepts from the Domain Model and modify or introduce new objects, as needed to make the system function work.
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
6 Types of Object Responsibilities Knowing responsibility : Memorizing data or  references, such as data values, data collections, or references  to other objects, represented as a property Doing responsibility : Performing computations, such as  data processing, control of physical devices, etc., represented as  a method Communicating responsibility : Communicating  with other objects, represented as message sending (method  invocation)
Image of page 6
7 Design: Assigning Responsibilities (a) (b) : PageMaker : DatabaseConn accessList := retrieve(params : string) interfacePage := render(accessList : string) ? ?
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern