Interaction diagrams and activity diagrams Speaker Realtime and

Interaction diagrams and activity diagrams Speaker: 陳 奕 全 Real-time and Embedded System Lab 15 August 2002 1

Outline • Introduction of interaction diagrams • Modeling flows of control • Introduction of activity diagrams • Modeling a workflow • Modeling a operation 2

Introduction of interaction diagrams • How do you model system’s dynamic aspects? – To build up storyboards of scenarios. • In UML, you model these storyboards by using interaction diagrams. ü storyboard: noun, a series of drawings or pictures that show the outline of the story of a film/movie, etc. 3

Introduction of interaction diagrams (Cont. ) • Interaction diagrams contain sequence diagrams and collaboration diagrams. • Sequence diagrams: emphasis the time ordering of messages. • Collaboration diagrams: emphasis the structural organization of objects that send/receive messages. • Both of them are semantically equivalent. 4

Introduction of interaction diagrams (Cont. ) • Collaboration diagrams • Sequence diagrams 5

Modeling flows of control • By time ordering: – Set the context for the interaction. – Set the stage for the interaction. – Set the lifeline for each object – Starting with the message – Visualize the nesting of messages (optional) – Specify time or space constraints (optional) 6

Modeling flows of control (Cont. ) 7

Modeling flows of control (Cont. ) • By organization: – Set the context for the interaction – Set the stage for the interaction – Set the initial properties of each object – Specify the links among – Starting with the messages that initiates this interaction – Specify time or space constraints (optional) 8

Modeling flows of control (Cont. ) 9

Introduction of activity diagrams • Consider the workflow associated with building a house. – select site, commission an architect, develop plan, bid plan, construction…until everything is done. • In a real project, there a lots of parallel • activities among various trades. We can model these dynamic aspects using activity diagrams. 10

Introduction of activity diagrams (Cont. ) • Activity diagrams shows the flow from activity to activity. • Activity: an ongoing nonatomic execution within a state machine. Activity Action Made up of executable atomic computations (send a signal, create, destroy) 11

Introduction of activity diagrams (Cont. ) • Activity diagrams commonly contain: – Activity states and action states – Transition • Sequential transition, branching, forking and joining. 12

Introduction of activity diagrams (Cont. ) – Objects • Swimlane: modeling workflows of business processes. • Flow of object: Usage of dependency relationships and objects 13

Modeling a workflow • To model a workflow – – – Establish a focus for the workflow. Select the business objects. Identify the conditions of the workflow’s states. Specify the activities and actions and render them in diagrams Render transitions the connect activity and action states. Render important objects in the activity diagrams. 14

Modeling a workflow (Cont. ) 15

Modeling a operation • To model a operation: – Collect the abstractions that are involved in this operation – Identify the precondition and postcondition – Specify the activities and actions and render them in diagrams – Specify conditional paths and iteration. – Use forking and joining to specify parallel flows of control 16

Modeling a operation Signature: one parameter and one return value 17