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  State Chart Diagram

Introduction State chart diagram

Various  issue  related to state chart diagrams are;

  • They model the dynamic aspects of systems.
  • A state chart diagram shows a state machine .
  • State chart diagrams as well as activity diagrams are instrumental in modelling the lifetime of an objects.

An  activity  diagram is a special  case of state chart  diagram in which  all or  most of the  states are activity  states. Along  with this most of the  transmissions are triggered by completion  of activities in the  source state.

State  chart  diagram  shows flow  of control from state to state  whereas in activity  diagrams, flow  of control  is shown from activity  to activity.

They are used  to model  the behaviour  of reactive objects. Reactive  objects are  objects whose characteristics are best  characterized by its  response to events dispatched from  outside its context. The behaviour of  a reactive objects is ffected by  its part. The context of the  state chart diagrams can be  best  understood by the following  analogy.

The Analogy for State chart Diagrams

Consider  an investor who  finances a  building. He is obviously  interested in  getting  a good return on  investment and that  means a protecting the  investment  against  risk. A clever investor will  setup clear milestones for the  project each  of which  is tied to the  completion of certain  activities. Money  is released only  after the  previous  phase is complied. Now  mapping  the analogy  into  our system:

  • Each of the milestone represents the state of the projects.
  • For investor following changing state of building is more important than following the flow of activities.
  • Contents of state chart diagram are the state and transitions between them.
  • The state chart diagram specifies
  • The stable state in which the objects may live.
  • Events that trigger a transition from state to state.
  • Action that occurs on each state change.
  • Uses of state chart diagram

Reactive  objects here are typically  idle until they receive an event. Their  behaviour is characterized by their  response to events  dispatched from  outside their context.

These diagrams  are used  to model  they dynamic  aspects  of a system. These dynamic  aspects encapsulate the event ordered behaviour of any kind of objects including classes,  interfaces components  and  nodes.

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