Event (UML) explained

An event[1] in the Unified Modeling Language (UML) is "something that may occur at a specific instant in time".[1]

Events can, but do not necessarily, cause state transitions from one state to another in state machines represented by state machine diagrams.

Consider "the case of two Transitions[2] originating from the same State,[3] triggered by the same event, but with different guards.If that event occurs and both guard conditions are true, then at most one of those Transitions can fire in a given run-to-completion step."[2]

Notes and References

  1. Book: Events. Unified Modeling Language 2.5.1. OMG Document Number formal/2017-12-05. December 2017. Object Management Group Standards Development Organization (OMG SDO). 290.
  2. Book: Transitions. Unified Modeling Language 2.5.1. OMG Document Number formal/2017-12-05. December 2017. Object Management Group Standards Development Organization (OMG SDO). 314.
  3. Book: StateMachines. Unified Modeling Language 2.5.1. OMG Document Number formal/2017-12-05. December 2017. Object Management Group Standards Development Organization (OMG SDO). 305.

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