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Datei: Sprache: VDM

Original von: VDM^©

\begin{vdm_al}
class RadNavSys

types
  public perfdata = nat * nat * real

instance variables
  dispatch : EventDispatcher := new EventDispatcher();
  appTasks : set of BasicTask := {};
  envTasks : map seq of char to EnvironmentTask := {|->};
  mode : nat

operations

  public RadNavSys: () ==> RadNavSys
  RadNavSys () ==
   (addApplicationTask(new MMIHandleKeyPressOne(dispatch));
    addApplicationTask(new RadioAdjustVolume(dispatch));
    addApplicationTask(new MMIUpdateScreenVolume(dispatch));
    addApplicationTask(new RadioHandleTMC(dispatch));
    addApplicationTask(new NavigationDecodeTMC(dispatch));
    addApplicationTask(new MMIUpdateScreenTMC(dispatch)) );

  -- the constructor initialises the system and starts the application
  -- tasks. because there are no events from the environment tasks yet
  -- all tasks will block in their own event handler loops. similarly
  -- the dispatcher task is started and blocked
  public RadNavSys: nat ==> RadNavSys
  RadNavSys (pi) ==
    ( mode := pi;
      cases (mode) :
        1 -> ( addApplicationTask(new MMIHandleKeyPressOne(dispatch));
               addApplicationTask(new RadioAdjustVolume(dispatch));
               addApplicationTask(new MMIUpdateScreenVolume(dispatch));
               addApplicationTask(new RadioHandleTMC(dispatch));
               addApplicationTask(new NavigationDecodeTMC(dispatch));
               addApplicationTask(new MMIUpdateScreenTMC(dispatch)) ),
        2 -> ( addApplicationTask(new MMIHandleKeyPressTwo(dispatch));
               addApplicationTask(new NavigationDatabaseLookup(dispatch));
               addApplicationTask(new MMIUpdateScreenAddress(dispatch));
               addApplicationTask(new RadioHandleTMC(dispatch));
               addApplicationTask(new NavigationDecodeTMC(dispatch));
               addApplicationTask(new MMIUpdateScreenTMC(dispatch)) )
      end;
      startlist(appTasks); start(dispatch) )
   pre pi in set {1, 2};

  -- the addApplicationTask helper operation instantiates the callback
  -- link to the task and adds it to the set of application tasks
  addApplicationTask: BasicTask ==> ()
  addApplicationTask (pbt) ==
    ( appTasks := appTasks union {pbt};
      dispatch.Register(pbt) );

  -- the addEnvironmentTask helper operation instantiates the callback
  -- link to the task and and starts the environment task. since the
  -- VDMTools command-line always has the highest priority, the task will
  -- not be scheduled for execution until some blocking operation is
  -- called or the time slice is exceeded
  addEnvironmentTask: EnvironmentTask ==> ()
  addEnvironmentTask (pet) ==
    ( envTasks := envTasks  munion {pet.getName() |-> pet};
      dispatch.Register(pet);
      pet.Run() );

  -- the Run operation creates and starts the appropriate environment tasks
  -- for this scenario. to ensure that the system model has ample time to
  -- make progress (because RadNavSys will be started from the VDMTools
  -- command-line which always has the highest priority) the calls to
  -- getMinMaxAverage will block until all responses have been received
  -- by the environment task
  public Run: () ==> map seq of char to perfdata
  Run () ==
    ( cases (mode):
        1 -> ( addEnvironmentTask(new VolumeKnob(dispatch,10));
               addEnvironmentTask(new TransmitTMC(dispatch,10)) ),
        2 -> ( addEnvironmentTask(new InsertAddress(dispatch,10));
               addEnvironmentTask(new TransmitTMC(dispatch,10)) )
      end;
      return { name |-> envTasks(name).getMinMaxAverage()
             | name in set dom envTasks } )

end RadNavSys
\end{vdm_al}

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