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Object-oriented analysis and design(OOAD) UML Slides. for more slides refer www.scmGalaxy.com.

Object-oriented analysis and design(OOAD) UML Slides. for more slides refer www.scmGalaxy.com.

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Activity Activity Presentation Transcript

  • Activity Diagram ATOI Software System Bangalore [email_address]
  • Activity Diagram
    • Activity diagrams provide a way to model the workflow of a business process or a way to model a class operation. Workflow
    • A workflow is a well-defined sequence of activities that produces an observable value or objective to an individual or entity when performed.
    • These diagrams are very similar to a flowchart because you can model a workflow from activity to activity or from activity to state.
  • Deficiency of UseCase Diagram
    • Use Case diagram presents a static view of system functionality but it contains no information about the dynamics of these functions.
      • When one usecase uses several others. We can not see in what order those other usecase are used.
      • When one usecase extends another. You do not see under what conditions or at what point the extension occurs.
      • Use cases temporal order and required sequencing among them is not seen.
  • Activity diagram provide one solution to all deficiencies
    • Use case can be refined into an activity diagram that “flowcharts” the steps in the usecase,
    • usecase uses several other usecase ,activity diagram can depict the order of use,
    • and when use case is extended by another usecase, the diagram shows when and why the extension occur.
  • Practical Example of Using Activity Diagram:
    • A company could use activity diagrams to model the flow for an approval of orders or model the paper trail of invoices or process of approving a documents.
    • An accounting firm could use activity diagrams to model any number of financial transactions.
    • A software company could use activity diagrams to model part of a software development process.
  • Activity
    • An activity represents the performance of “task” or “duty” in a workflow. It may also represent the execution of a statement in a procedure. An activity is similar to a state, but expresses the intent that there is no significant waiting (for events) in an activity.
    Graphical Depiction Compartment for actions
    • Action: (atomic) An action is best described as a “task” that takes place while inside a state or activity
    • There are four possible actions within a state or activity:
    • On Entry
    • On Exit
    • Do
    • On Event
  • Actions of activity explained On event>> On exit send target
  • Activity can be employed in depicting:
    • When modeling business process, it can correspond to a human task, such as approving a document etc.
    • When flowcharting a UseCase, it can correspond to one step in that use case.
    • When specifying temporal order among use case, it can correspond to a system function
  • Activity diagram notations Activity B follows activity A Activity 2 conditionally follows activity 1
  • Activity diagram notations
  • Activity Diagram v/s State Diagram
    • The activity diagrams are mostly activity centric and they are typically used for modeling the sequence of activities in a process
    • transitions are implicitly triggered by completion of the actions in the source activities
    • Statecharts are state centric & statechart is better suited to model the discrete stages of an object’s lifetime
    • Transformation of state to state is dependent / or caused by a event, ie it is event dependent.
    An activity diagram is considered a special case of a state machine in which most of the states are activities and most of the transitions are implicitly triggered by completion of the actions in the source activities