State Diagrams
A state diagram describes the life history of objects of a given class.
A state diagram is used to show the following:
The state space of a given class
The events that cause a transition from one state to another
The actions that result from a state change
A state diagram is a directed graph of states connected by transitions.
State Notation
A state is a condition in which an object can reside during its lifetime while it satisfies some condition, performs an activity, or waits for an event. A state icon is a rounded rectangle with a name and a compartment.
For example, Figure D.7 shows the state diagram of a stateful session bean instance. It consists of three states: Instance does not exist, Ready, and Passive.
Figure D.7. State ...
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