Conclusion. Sequence diagrams and activity diagrams provide a graphical notation that can enhance a textual specification (e.g., based on use cases). In RE, system sequence diagrams (SSDs) model the system as a black box and focus on the events generated by actors and how they are handled by the system. Activity diagrams are data/control flow graphs. This article covers the three most commonly used – the activity diagram, sequence diagram, and state machine diagram. Note that the OCUP 2 Foundation level examination covers concurrency only in the activity diagram; concurrency in sequence and state machine diagrams is covered at the Intermediate and Advanced levels. Activity diagram.
UML Examples: Elevator Simulation
The sequence diagram represents the flow of messages in the system and is also termed as an event diagram. It helps in envisioning several dynamic scenarios. It portrays the communication between any two lifelines as a time-ordered sequence of events, such that these lifelines took part at the run time.
A product is to be installed to control elevators in a building with m floors. The problem concerns the logic required to move elevators between floors according to the following constraints:
- Each elevator has a set of m buttons, one for each floor. These illuminate when pressed and cause the elevator to visit the corresponding floor. The illumination is canceled when the elevator visits the corresponding floor.
- Each floor, except the first floor and top floor has two buttons, one to request and up-elevator and one to request a down-elevator. These buttons illuminate when pressed. The illumination is canceled when an elevator visits the floor and then moves in the desired direction.
- When an elevator has no requests, it remains at its current floor with its doors closed.
Use Case Diagram
Use case description:
- A generalized description of how a system will be used.
- Provides an overview of the intended functionality of the system.
- Understandable by laymen as well as professionals.
The Use Case Diagram is usually accompanied by a Use Case Detail (or Spec) that takes this format:
|Use Case Detail: Overdrawn Report |
Class diagrams show the static structure of the object, their internal structure, and their relationships.
Detailed Class Diagram
A state diagram shows the sequences of states an object goes through during it's life cycle in response to stimuli, together with its responses and actions.
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The design phase should produce detailed class diagrams, collaboration diagrams, sequence diagrams, state diagrams, and activity diagram. However, the elevator problem is too simple for an activity diagram. Thus, we are not using an activity diagram for the elevator problem.
A sequence diagram and collaboration diagram conveys similar information but expressed in different ways. A Sequence diagram shows the explicit sequence of messages suitable for modeling a real-time system, whereas a collobration diagram shows the relationships between objects.
Sequence Diagram for Serving Elevator Button
Sequence Diagram for Serving Door Button
Activity Diagram To Sequence Diagram
- Describes the set of interactions between classes or types
- Shows the relationships among objects
Collabration Digaram for Serving Elevator Button
Sequence Diagram Tool
Collabration Digaram for Serving Door Button