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UML Activity Diagrams-Forking and Joining

UML Activity Diagrams-OOAD Lecture Notes
Forking and Joining
  • Forks are used for showing parallel execution of activities 
  • A fork may have one incoming transition and two or more outgoing transitions each of which represents an independent flow of control A fork represents the splitting of a single flow of control into two or more concurrent flows of control 
  • Below the fork, the activities associated with each of these paths continues in parallel 
  • A join may have two or more incoming transitions and one outgoing transition 
  • Above the join, the activities associated with each of these paths continues in parallel 
  • At the join, the concurrent flows synchronize, meaning that each waits until all incoming flows have reached the join, at which point one flow of control continues on below the join 
  • The forking and joining of the parallel flows of control are specified by a synchronization bar 
  • A synchronization bar is rendered as a thick horizontal or vertical line
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Swimlanes
  • Swimlanes partitions activity diagrams into groups having activity states where each group represents the entity responsible for those activities 
  • Each swimlane has a name unique within its diagram 
  • Swimlane represents a high-level responsibility for part of the overall activity of an activity diagram 
  • Each swimlane is implemented by one or more classes
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Object flow
  • Object flow indicates the participation of an object in a flow of control. It shows the objects created as a result of an activity, and in which activities those objects are used 
  • It is represented with the help of dependency relationships 
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Activity diagram is used: 
  • To model a workflow 
  • To model an operation


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