Table of Contents
What are events in state diagram?
An event is the specification of a significant occurrence that has a location in time and space. In the context of state machines, an event is an occurrence of a stimulus that can trigger a state transition. A guard condition is evaluated after the trigger event for the transition occurs.
What is event in state transition diagram?
State-transition diagrams describe all of the states that an object can have, the events under which an object changes state (transitions), the conditions that must be fulfilled before the transition will occur (guards), and the activities undertaken during the life of an object (actions).
How is an activity diagram different from a state diagram?
When an OR superstate is “on”, one of its states is “on”. Activity diagrams describe activities which involve concurrency and synchronization. Activity diagrams are a variation of state diagrams that focuses on the flow of actions and events. Can be used To model a human task (a business process, for instance).
What is an event in a state machine?
An event is the specification of a significant occurrence that has a location in time and space. In the context of state machines, an event is an occurrence of a stimulus that can trigger a state transition. A guard condition is evaluated after the trigger event for the transition occurs.
How is a state diagram composed in UML?
For UML state diagrams, states can be composed into nested states, or superstates. Such compositions make it possible to view a state diagram at different levels of abstraction. A superstate c onsists of one or more states. When an AND superstate is “on”, all its states are also “on”.
What does transition mean in a state diagram?
A transition is a relationship between two states indicating that an object in the first state will perform certain actions and enter the second state when a specified event occurs and specified conditions are satisfied. Activity is an ongoing non-atomic execution within a state machine.