Interaction Models

1
Interaction Models
2
Interaction Definition

• An interaction is a behavior that comprises a set
  of messages exchanged among a set of objects
  within a context to accomplish a purpose.

3
Modeling Interactions

• One of two ways
• Emphasize its time ordering of messages
• Emphasize its sequencing of messages in the
  context of some structural organization of
  objects.

4
Object Interaction Models

• The use case and its scenarios serve as a vehicle
  for organizing the object interactions that take
  place. Each scenario involves a certain set of
  interactions.
• UML uses two different notations and models for
  object interaction diagrams one is called
  sequence diagram and the other a communication
  diagram.
• The sequence diagram presents object interaction
  arranged in time sequence.
• It shows the object involved in time scenario and
  the sequence of messages that are exchanged.

5
Object Interaction Models

• The communication diagram shows interaction
  organized around the objects and their messages
  to each other.
• These two diagram forms are interchangeable, some
  CASE tools will automatically generate one from
  the other. Which one to use is up to the
  developer.

6
Sequence diagram notationFig 5.9
7
(No Transcript)
8
Mapping Scenarios to Sequence Diagrams

• A user connects to a Customer Manager module
  named CM. CM makes a self-call to locate the
  customer. CM then activates a customer object
  (aCustomer) corresponding to the user. CM
  redirects the user to aCustomer, at which time
  the user can update the information associated
  with aCustomer.