SElec-5 DomainModel (1)

# SElec-5 DomainModel (1) - LECTURE 5 Domain Modeling Ivan...

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Ivan Marsic Rutgers University LECTURE 5: Domain Modeling

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Topics Identifying Concepts Concept Associations Concept Attributes Contracts: Preconditions and Postconditions
Use Cases vs. Domain Model (b) (a) In use case analysis , we consider the system as a “ black box Actor System Actors Use Case 1 Use Case 2 Use Case N Actor Actors Domain Model In domain analysis , we consider the system as a “ transparent box

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Example: ATM Machine (b) (a) 1 2 3 4 5 6 7 8 9 0 Actor (Bank customer) System Actor (Remote datacenter) (ATM machine) Concept 2 Concept 1 Actor Concept 3 Concept n Domain Model Actor
Building a Domain Model Step 1: Identifying the boundary concepts Step 2: Identifying the internal concepts Actor A Actor B Actor D Actor C Boundary concepts Concept 2 Concept 3 Concept 4 Concept 1 Actor A Actor B Actor C Actor D Concept 1 Concept 2 Internal concepts Concept 3 Concept 5 Concept 4 Concept 6

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Use Case 1: Unlock Use Case UC-1: Unlock Re late d Re q uire m e nts : REQ 1, REQ 3, REQ 4, and REQ 5 s tate d in Table  2-1 Initiating  Ac to r: Any o f: Te nant, Landlo rd Ac to r’s  G o al: To  dis arm  the  lo c k and e nte r, and g e t s pac e  lig hte d up auto m atic ally. Partic ipating  Ac to rs : Lo c kDe vic e , Lig htS witc h, Tim e r Pre c o nditio ns :  The  s e t o f valid ke ys  s to re d in the  s ys te m  databas e  is  no n-e m pty.   The   s ys te m   dis plays   the   m e nu  o f  available   func tio ns ;  at  the   do or  ke ypad  the   m e nu  c ho ic e s  are  “Lo c k” and “Unlo c k.” Po s tc o nditio ns : The  auto -lo c k tim e r has  s tarte d c o untdo wn fro m  auto Lo c kInte rval. Flo w o f Eve nts  fo r Main S uc c e s s  S c e nario : 1. Te nant/Landlo rd arrive s  at the  do o r and s e le c ts  the  m e nu ite m  “Unlo c k” 2. inc lude :: AuthenticateUser  (UC-7) System (a) signals to the Tenant/Landlord the lock status, e.g., “disarmed,” (b) signals to LockDevice to disarm the lock, and (c)
Extracting the Responsibilities Responsibility Description Type Concept Name Coordinate actions of all concepts associated with a use case, a logical grouping of use cases, or the entire system and delegate the work to other concepts. D Controller Container for user’s authentication data, such as pass-code, timestamp, door identification, etc. K Key Verify whether or not the key-code entered by the user is valid. D KeyChecker C

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Domain Model (1) «entity» KeyChecker «control» Controller «entity» Key «entity» KeyStorage Symbolizes worker ”-type concept.
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