 Engineering Quality Software

 Today o State Diagrams Jerry Kotuba SYST30009-Engineering Quality Software 2

Jerry KotubaObject Oriented Methods3

 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. Jerry KotubaObject Oriented Methods4

 Objects within the business domain (i.e., the context diagram) o Entity objects  Other objects o Interface objects…user access to the system o Control objects…application or business rule logic Jerry KotubaObject Oriented Methods5

 Models the dynamic aspects of a system as it moves from state to state Jerry KotubaObject Oriented Methods6

Jerry KotubaObject Oriented Methods7

 Lifetimes and Life Cycles  Events and States  Transitions  Actions and Activities  The Statechart Diagram  Object Lifecycles on the Statechart Diagram Jerry KotubaObject Oriented Methods8

Jerry KotubaObject Oriented Methods10

 state diagram exploded into lower levels  states can be exploded into substates Jerry KotubaObject Oriented Methods11

Jerry KotubaObject Oriented Methods12

 SLATE- Week08 o Cell Phone Exercise Jerry KotubaObject Oriented Methods13

 [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 Jerry KotubaObject Oriented Methods14

 [5] Identify concurrent paths.  [6] Look for additional transitions  [7] Expand each transition as appropriate  [8] Review and test each statechart Jerry KotubaObject Oriented Methods15

 SLATE – Week08 o ICE-06 Jerry KotubaObject Oriented Methods16

Jerry KotubaObject Oriented Methods17

 something that happens at a certain point in time  important occurrence that triggers a state transition o i.e. place an order, register for class, apply for loan, hire new employee  An event is considered to be instantaneous

 must be named after the event  may include the following: o [guard condition] shown in square brackets o /action expression action specified after the / slash o parameters of the event i.e. 3 month timeframe

 Concurrency: condition of being in more than one state at a time  Two modes of representation o Use synchronization bars and concurrent paths o Nest low-level states inside higher-level states  Higher-level states also called composite states o Complex structure of sets of states and transitions o Represent a higher level of abstraction Jerry KotubaObject Oriented Methods23

 Read text  What comes next? o Complete state charts o Begin Sequence Diagrams Jerry KotubaObject Oriented Methods24