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Lesson10Engineering Quality Software
Agenda Today
o State Diagrams
Jerry KotubaSYST30009-Engineering Quality
Software2
The Big Picture
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Learning outcomes Learn how to construct a state chart of an object. Learn how to discover operations (behaviors) for
the classes we found by studying object life cycles.
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Focus so far… Objects within the business domain (i.e., the
context diagram)o Entity objects
Other objectso Interface objects…user access to the systemo Control objects…application or business rule logic
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State chart Diagrams Models the dynamic aspects of a system as it
moves from state to state
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Printer Example -Illustration
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Object States and the State chart Diagram
Lifetimes and Life Cycles Events and States Transitions Actions and Activities The Statechart Diagram Object Lifecycles on the Statechart Diagram
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Notation for Statechart Diagram
Symbol
Purpose
An object’s current state (status)
Denotes the beginning of state chart flow
Arrow indicates the direction of transition from origin to destination state.
Indicates terminal state of an object.
Transition / name
[Guard] / Action
Transition Label
System Architect Tools
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Substates state diagram exploded into lower levels states can be exploded into substates
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Printer Example –Illustration 2
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Your turn… SLATE- Week08
o Cell Phone Exercise
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Rules for Developing Statecharts
[1] Select the classes that will require statecharts
[2] List all the status conditions for each group
[3] Specify transitions that cause object to leave the identified state
[4] Sequence state-transition combinations in correct order
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Rules for Developing Statecharts (continued)
[5] Identify concurrent paths.
[6] Look for additional transitions
[7] Expand each transition as appropriate
[8] Review and test each statechart
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Assignment SLATE – Week08
o ICE-06
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Other Examples
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Event
something that happens at a certain point in time
important occurrence that triggers a state transitiono i.e. place an order,
register for class, apply for loan, hire new employee
An event is considered to be instantaneous
Transition
must be named after the event
may include the following:o [guard condition]
• shown in square brackets
o /action expression• action specified
after the / slasho parameters of the
event• i.e. 3 month
timeframe
State Diagram for Student Registration
Nested State Diagram forMatriculated State of Student Object
Nested States And Concurrency
Concurrency: condition of being in more than one state at a time
Two modes of representationo Use synchronization bars and concurrent pathso Nest low-level states inside higher-level states
Higher-level states also called composite stateso Complex structure of sets of states and
transitions o Represent a higher level of abstraction
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For Next Class Read text What comes next?
o Complete state chartso Begin Sequence Diagrams
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