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12. Components of the object model of the OpenSCADA system

Object model of the OpenSCADA system is based on the function object TFunction, on the parameters of the function IO and on the values' frame of the function TValFunc. Later the function's objects are included in the object tree, forming an object model of the system. Using the functions of the object model is made by linking the frame of values TValFunc with function.

The idea in general is shown in Fig. 7.

Fig. 7. The basis of the programming area of the OpenSCADA system.

Object of the function (TFunction) provides an interface for the formation of function parameters and algorithm of the computing in the object which inherits it.

Object of the function's parameter (IO) contains the configuration of the single parameter.

Object of the values' frame (TValFunc) contains values in accordance with the structure of the linked function. While the execution of the algorithm by the associated function the values of this object are used.

12.1. The function object (TFunction)

Public methods:

• TFunction( const string &iid ); — Initializing constructor of the function with the identifier <id>.
• TFunction &operator=( TFunction &func ); — Copying of functions.
• string id( ); — Function ID.
• virtual string name( ); — Localized name of the function.
• virtual string descr( ); — Description of the function.
• bool startStat( ); — Status - "Running".
• int use( ); — Counter of the function's using.
• virtual void setStart( bool val ); — Start/stop <val> of the function.
• void ioList( vector<string> &list ); — The list of the function's parameters <list>.
• int ioId( const string &id ); — Getting the index of the function's parameter <id>.
• int ioSize( ); — The quantity of the function's parameters.
• IO *io( int id ); — Getting the function's parameter by the index <id>.
• void ioAdd( IO *io ); — Addition of the function's parameter <io>.
• int ioIns( IO *io, int pos ); — Insert of the function's parameter <io> into the position <pos>. Returns the actual position of the new parameter.
• void ioDel( int pos ); — Deleting the function's parameter in the position <pos>.
• void ioMove( int pos, int to ); — Moving the function's parameter from the position <pos> to the position to>.
• virtual void calc( TValFunc *val ); — The calculation of the function's algorithm of the specified values <val>.
• virtual void valAtt( TValFunc *vfnc ); — Is called by the object of the values' frame <vfnc> in the case of attaching with the function.
• virtual void valDet( TValFunc *vfnc ); — Is called by the object of the values' frame <vfnc> in the case of detaching from the function.
• virtual void preIOCfgChange( ); — Is called before the changing of the configuration of the function.
• virtual void postIOCfgChange( ); — Is called after the changing of the configuration of the function.

Protected attributes:

• string mId; — Function ID.
• bool run_st; — Sign - "Running".
• TValFunc *mTVal; — Reference to the values' object, used for testing the function. May be absent.

12.2. The object of the function's parameter (IO)

Data:
Parameter's type (enum — IO::Type):

• IO::String — string/text;
• IO::Integer — integer;
• IO::Real — real;
• IO::Boolean — boolean;
• IO::Object — object.

Parameter's flags (enum — IO::IOFlgs):

• IO::Default — default mode (input);
• IO::Output — output;
• IO::Return — return.

Public methods:

• IO( const char *id, const char *name, IO::Type type, unsigned flgs, const char *def = "", bool hide = false, const char *rez = "" ); — Initializing constructor.
• IO &operator=( IO &iio ); — Copying of the function parameters.
• const string &id( ); — ID of the function's parameter.
• const string &name( ); — The localized name of the function's parameter.
• const Type &type( ); — The type of the function's parameter.
• unsigned flg( ); — The flags of the function's parameter.
• const string &def( ); — Default value.
• bool hide( ); — Sign - "Hide".
• const string &rez( ); — The reserve property of the function's parameter.
• void setId( const string &val ); — Set the identifier to <val>.
• void setName( const string &val ); — Set the name to <val>.
• void setType( Type val ); — Set the type to <val>.
• void setFlg( unsigned val ); — Set the flags to <val>.
• void setDef( const string &val ); — Set the default value to <val>.
• void setHide( bool val ); — Set/unset the sign - "Hide".
• void setRez( const string &val ); — Set the reserve property to <val>.

12.3. The object of the function's value (TValFunc).

Public methods:

• TValFunc( const string &iname = "", TFunction *ifunc = NULL, bool iblk = true ); — Initializing constructor.
• string user( ); — User on whose behalf the function is executed.
• const string &vfName( ); — Name of the values' object.
• bool blk( ); — The sign - "Blocking of the parameters' changes of the function".
• bool dimens( ); — The sign - "To measure the computation time".
• bool mdfChk( ); — The sign - "To check attributes to modify".
• void setUser( const string &iuser ); — Set the user on whose behalf the function will be executed.
• void setVfName( const string &nm ); — Set the name of the values' object to <nm>.
• void setDimens( bool set ) — Set/unset <set> of the sign - "To measure the computation time".
• void setMdfChk( bool set ); — Set/unset <set> of the sign - "To check attributes to modify".
• void ioList( vector<string> &list ); — The list of the function's parameters <list>.
• int ioId( const string &id ); — Getting the parameter's index <id>.
• int ioSize( ); — The whole quantity of the parameters.
• IO::Type ioType( unsigned id ); — Parameter's type <id>.
• unsigned ioFlg( unsigned id ); — Parameter's flags <id>.
• bool ioHide( unsigned id ); — Parameter's sign <id> - "Hide".
• bool ioMdf( unsigned id ); — Parameter's sign <id> - "Modified".
• TVariant get( unsigned id ); — Get the value of the parameter <id>.
• string getS( unsigned id ); — Get the value (string) of the parameter <id>.
• int getI( unsigned id ); — Get the value (integer) of the parameter <id>.
• double getR( unsigned id ); — Get the value (real) of the parameter <id>.
• bool getB( unsigned id ); — Get the value (boolean) of the parameter <id>.
• AutoHD<TVarObj> getO( unsigned id ); — Get the value of the parameter's object <id>.
• void set( unsigned id, const TVariant &val ); — Set the value <val> of the parameter <id>.
• void setS( unsigned id, const string &val ); — Set the value <val> (string) of the parameter <id>.
• void setI( unsigned id, int val ); — Set the value <val> (integer) of the parameter <id>.
• void setR( unsigned id, double val ); — Set the value <val> (real) of the parameter <id>.
• void setB( unsigned id, bool val ); — Set the value <val> (boolean) of the parameter <id>.
• void setO( unsigned id, AutoHD<TVarObj> val ); — Set the value <val> of the parameter's object <id>.
• virtual void calc( const string &user = "" ); — To calculate on behalf of the user <user> or user, specified earlier.
• double calcTm( ); — Computation time.
• void setCalcTm( double vl ); — Initializing of the time of value's calculation <vl>.
• TFunction *func( ); — Attached function.
• void setFunc( TFunction *func, bool att_det = true ); — To attach with the specified function <func>.
• virtual void preIOCfgChange( ); — Is called before the configuration changes.
• virtual void postIOCfgChange( ); — Is called after the configuration changes.
• TValFunc *ctxGet( int key ); — Get context for key <key>.
• void ctxSet( int key, TValFunc *val ); — Set context for key <key>.
• void ctxClear( ); — External functions call context clear.

Public attributes:

• void *exCtx; — The function execution context.