It is possible to have multiple transitions from the same source state and with the same event trigger, as long as the guard conditions don’t overlap.
In the context of state machines, an event is an occurrence of a stimulus that can trigger a state transition.Ī guard condition is evaluated after the trigger event for the transition occurs. This notation permits you to visualize the behavior of an object in a way that lets you emphasize the important elements in the life of that object.Ī state machine is a behavior that specifies the sequences of states an object goes through during its lifetime in response to events, together with its responses to those events.Ī state is a condition or situation during the life of an object during which it satisfies some condition, performs some activity, or waits for some event.Īn event is the specification of a significant occurrence that has a location in time and space. The Figure below shows the key elements of a state diagram in UML. You use state machines to model the behavior of any modeling element, although, most commonly, that will be a class, a use case, or an entire system which focuses on the event-ordered behavior of an object, which is especially useful in modeling reactive systems. State diagrams emphasize the event-ordered behavior of an object, which is especially useful in modeling reactive systems. They are especially important in modeling the behavior of an interface, class, or collaboration. You use state diagrams to illustrate the dynamic view of a system. A state diagram consists of states, transitions, events, and activities.
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